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Mysteries of omicron variant could take weeks to untangle

FILE - A woman receives a coronavirus vaccine in Abuja, Nigeria, Monday, Nov 29, 2021. A pandemic-weary world faces weeks of confusing uncertainty as countries restrict travel and take other steps to halt the newest potentially risky coronavirus mutant before anyone knows just how dangerous omicron really is. (AP Photo/Gbemiga Olamikan, File) FILE - People wearing face masks to curb the spread of COVID-19 walk in downtown Lisbon, Monday, Nov. 29, 2021. A pandemic-weary world faces weeks of confusing uncertainty as countries restrict travel and take other steps to halt the newest potentially risky coronavirus mutant before anyone knows just how dangerous omicron really is. (AP Photo/Ana Brigida, File) FILE - Passengers wait at a ticket counter at Johannesburg's OR Tambo's airport, Monday Nov. 29, 2021. A pandemic-weary world faces weeks of confusing uncertainty as countries restrict travel and take other steps to halt the newest potentially risky coronavirus mutant before anyone knows just how dangerous omicron really is. (AP Photo/Jerome Delay, File) FILE - A worker disinfects chairs at a new vaccination center in Lisbon, Tuesday, Nov. 30, 2021. A pandemic-weary world faces weeks of confusing uncertainty as countries restrict travel and take other steps to halt the newest potentially risky coronavirus mutant before anyone knows just how dangerous omicron really is. (AP Photo/Armando Franca, File)