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