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Cases drop for first time as Africa's fourth COVID-19 wave ebbs
By Meenakshi Dalal
How Omicron Is Different Than Delta
By Jonathan Corum & Emily Anthes
Covid reinfection: how likely are you to catch virus multiple times?
By Nicola Davis
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How Omicron highlights fading hope of herd immunity from COVID
By Julie Steenhuysen
Omicron cases dip in the US overall, but the wave is far from over in many parts of the country
By Deidre McPhillips
COVID-19: How long is contagious period for Omicron, Delta?
By Catherine Schuster-Bruce