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European wave of Omicron sub-variant BA.2 foreshadows US surge
By John Burn-Murdoch, Oliver Barnes & Leila Abboud
How protected are we against Covid-19? Scientists search for a test to measure immunity
Omicron's 'stealth' subvariant BA.2 could go 'wild' in Europe before going global, top epidemiologist says
By Holly Ellyatt
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Can you catch the omicron COVID-19 variant twice?
By Alix Martichoux
AstraZeneca COVID drug neutralises Omicron sub-variants in lab study
By Pushkala Aripaka, Aditya Soni & Kalluvila Sriraj
A Stress Test for America's New COVID Plan Is Coming
By Katherine J. Wu
Omicron BA.2 Variant Now More Than Half Of All New Covid Cases Across Large Swath In U.S., Per CDC
By Tom Tapp
What is the new COVID-19 variant BA.2, and will it cause another wave of infections in the US?
By Prakash Nagarkatti & Mitzi Nagarkatti