Danielle St. Laurent, The New York Times
COVID-19 rapid antigen test kits designed for home use, in Maplewood, N.J., Dec. 21, 2021. Studies suggest that while most people stop testing positive on antigen tests sometime during the first 10 days of their illnesses, a notable subset of people continue to test positive for longer, for reasons that scientists do not entirely understand. 
Getting your player ready...
Colorado's COVID-19 hospitalizations and cases rose less steeply this past week than they had recently, but it doesn't appear that the current upswing is over.
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