Latest: US to spend $470M to learn more about long COVID-19


              A dengue patient rests under a mosquito net at the dengue ward of a government hospital in Prayagraj, Uttar Pradesh state, India, Wednesday, Sept. 15, 2021. Officials say infections following monsoon rains have led to a fever outbreak in this northern state, killing more than hundred people in the past three weeks. The state’s health minister told The Associated Press that most cases were caused by dengue, a seasonal viral infection spread by mosquitoes, followed by leptospirosis, scrub typhus, and malaria. (AP Photo/Rajesh Kumar Singh)
            
              Workers plant white flags as part of artist Suzanne Brennan Firstenberg's temporary art installation, "In America: Remember," in remembrance of Americans who have died of COVID-19, on the National Mall in Washington, Wednesday, Sept. 15, 2021. The installation will consist of more than 630,000 flags when completed. (AP Photo/Patrick Semansky)
            
              Sunlight shines on white flags that are part of artist Suzanne Brennan Firstenberg's temporary art installation, "In America: Remember," in remembrance of Americans who have died of COVID-19, on the National Mall in Washington, Wednesday, Sept. 15, 2021. The installation will consist of more than 630,000 flags when completed. (AP Photo/Patrick Semansky)
            
              White flags stand near the Washington Monument on the National Mall in Washington, Wednesday, Sept. 15, 2021. The flags, which will number more than 630,000 when completed, are part of artist Suzanne Brennan Firstenberg's temporary art installation, "In America: Remember," in remembrance of Americans who have died of COVID-19. (AP Photo/Patrick Semansky)
            People visit the Alipore Zoo after it reopened for the public in Kolkata, India, Wednesday, Sept. 15, 2021. The zoo was closed in May this year due to the coronavirus pandemic. (AP Photo/Bikas Das) Visitors watch a Royal Bengal Tiger standing inside its enclosure at the Alipore Zoo after it reopened for the public in Kolkata, India, Wednesday, Sept. 15, 2021. The zoo was closed in May this year due to the coronavirus pandemic. (AP Photo/Bikas Das) A health worker prepares to administer a dose of Covaxin during a special vaccination drive for homeless and migrant workers against COVID-19 in New Delhi, India, Wednesday, Sept. 15, 2021. (AP Photo/Altaf Qadri) A child undergoes treatment at the Sarojini Naidu Children's Hospital, in Prayagraj, Uttar Pradesh state, India, Wednesday, Sept. 15, 2021. Officials say infections following monsoon rains have led to a fever outbreak in this northern state, killing more than hundred people in the past three weeks. The state's health minister told The Associated Press that most cases were caused by dengue, a seasonal viral infection spread by mosquitoes, followed by leptospirosis, scrub typhus, and malaria. (AP Photo/Rajesh Kumar Singh) 
              European Commission President Ursula von der Leyen delivers a State of the Union Address at the European Parliament in Strasbourg, France, Wednesday, Sept. 15, 2021. The European Union announced Wednesday it is committing 200 million more coronavirus vaccine doses to Africa to help curb the COVID-19 pandemic on a global scale. (Yves Herman, Pool via AP)
            Students socially distance as they sit in a classroom at the Preah Sisowath high school in Phnom Penh, Cambodia, Wednesday, Sept. 15, 2021. The Municipal of Phnom Penh recently issued a statement to reopen junior high and high schools due to the high number of vaccination rates for teachers and students, low infection rates and the schools' to compliance to health standards. (AP Photo/Heng Sinith) UConn sophomore Sahiti Bhyravavajhala assists students moving into Shippee Hall on the Storrs, Conn. campus, Friday, Aug. 27, 2021. UConn is one of many schools across the nation mandating that returning students be vaccinated against COVID-19. An analysis by The Associated Press shows 26 of the nation's 50 largest public universities aren't requiring the vaccination. (AP Photo/Pat Eaton-Robb) FILE - In this Wednesday, Dec. 16, 2020, file photo, a syringe containing a dose of the Pfizer COVID-19 vaccine sits in a container during a vaccine clinic at Providence Alaska Medical Center in Anchorage, Alaska. Overwhelmed by a surge in COVID-19 patients, Providence Alaska Medical Center, Alaska's largest hospital, on Tuesday, Sept. 14, 2021, implemented crisis standards of care, prioritizing resources and treatments to those patients who have the potential to benefit the most.(Loren Holmes/Anchorage Daily News via AP, Pool, File) President Joe Biden speaks in the State Dining Room at the White House, Thursday, Sept. 9, 2021, in Washington. Labor unions are divided over vaccine mandates. The split has become more significant after Biden announced his plan to require federal workers get inoculated and private companies with more than 100 employees get vaccinated.  (AP Photo/Andrew Harnik)