Excitement meets worry as European kids head back to school


              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Year 7 pupils write signs in class as they arrive back at Great Academy Ashton in Manchester as schools reopen after the summer holidays, Ashton-Under-Lyne, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. ( AP Photo Jon Super)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              Pupils at Covid test station as they entered their new secondary school for the first time at Wales High school, Sheffield, England, Friday, Sept. 3, 2021. Fewer measures are in place in schools than during last term, with bubbles and masks no longer in use in England and Wales, while Northern Ireland has also scrapped social distancing requirements. (AP Photo/Rui Vieira)
            
              FILE - In this Aug. 31, 2021, file photo, girls walk in a deserted school yard, in Kosovo's capital Pristina. In Kosovo, where the weekly average of new cases rose more than tenfold between July and August, the start of the school year has been delayed by two weeks until Sept. 13. (AP Photo/Visar Kryeziu, File)
            
              FILE - In this Sept. 2, 2021, file photo, children play as French President Emmanuel Macron visits the Bouge primary school in Malpasse district of Marseille, southern France. In France face coverings must be worn by pupils 6 and up, and whole primary school classes will be sent home if one child tests positive. (AP Photo/Daniel Cole, Pool, File)
            
              FILE - In this Aug. 12, 2021, file photo, pro-mask and non-mask wearing demonstrators face off at the Cobb County School Board Headquarters in Marietta, Ga. The start of school year has also led to fierce battles between parents and administrators over mask requirements that have devolved into violence at times. In the state of Georgia, many school superintendents said they experienced more cases and quarantines in the first few weeks of class than during all of last year. (AP Photo/Mike Stewart, File)
            
              FILE - In this Sept. 1, 2021, file photo, a girl raises her hand in class on the first day of school at College des Freres in the Old City of Jerusalem. Even in countries with high inoculation rates, warning bells are sounding in areas where schools have already returned. Israel is restricting students in areas with the highest infection rates to online learning for now. (AP Photo/Maya Alleruzzo, File)
            
              FILE - In this Sept. 2, 2021, file photo, French President Emmanuel Macron speaks with children during a visit at Bouge primary school in Malpasse district of Marseille, southern France.  In France face coverings must be worn by pupils 6 and up, and whole primary school classes will be sent home if one child tests positive. (AP Photo/Daniel Cole, Pool, File)
            
              FILE - In this Sept. 1, 2021, file photo, children wearing face masks to prevent the spread of coronavirus walk in the corridor as they return to primary school in the village of Belegis, west of Belgrade, Serbia. In the Balkan nations that are among Europe’s poorest, meanwhile, low vaccination rates and surging outbreaks have made it difficult to get kids back to class after a year and a half. (AP Photo/Darko Vojinovic, File)
            
              FILE - In this Sept. 2, 2021, file photo, children sit in a classroom at school in Strasbourg, eastern France. In France face coverings must be worn by pupils 6 and up, and whole primary school classes will be sent home if one child tests positive. (AP Photo/Jean-François Badias, File)
            
              FILE - In this Sept. 1, 2021, file photo, a teacher speaks to students on their first day back, at a primary school, in the village of Belegis, 25 kilometers west of Belgrade, Serbia. Children across Europe are going back to school, with hopes of a return to normality after 18 months of pandemic disruption and fears of a new surge in infections from the highly infectious delta variant of the coronavirus. (AP Photo/Darko Vojinovic, File)