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What are the symptoms of the omicron variant?
By Cassie Werber
Vaccine inequity and hesitancy made the Omicron variant more likely, scientists say
By Ivana Kottasová
Scientists rapidly identified the Omicron variant. But firm answers about its impact could take weeks
By Andrew Joseph
Moderna: Modified COVID vaccine for Omicron could be out by early 2022
By Yelena Dzhanova
Dutch find 13 Omicron cases among S.Africa travellers
By Bart H Meijer
U.S. readies fight against Omicron but too soon for lockdowns -Fauci
By Susan Heavey, Heather Timmons & Mark Porter