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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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Russia's daily COVID-19 cases hit record high for fifth day running
By Alexander Marrow & Gleb Stolyarov
How Omicron highlights fading hope of herd immunity from COVID
By Julie Steenhuysen
Omicron might be the worst Covid gets when it comes to transmissibility, experts predict
By Jade Scipioni
COVID-19: How long is contagious period for Omicron, Delta?
By Catherine Schuster-Bruce