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WHO labels new Covid strain, named omicron, a 'variant of concern,' citing possible increased reinfection risk
By Robert Towey & Sam Meredith
As an alarming new coronavirus variant emerges, Canada moves to limit travel from southern Africa
By John Paul Tasker
What to know about the omicron variant and subvariant BA.2
By Lindsey Bever, Joel Achenbach & Meryl Kornfield
Biden admin announces travel ban for South Africa and 7 other countries, citing new variant
By Myah Ward
What's known and unknown about Omicron, the coronavirus variant identified in South Africa
By Andrew Joseph
What to know about omicron, the new COVID variant
By Michaeleen Doucleff
Omicron: What we know about Covid strain prompting fresh global restrictions
By Clive Cookson & Oliver Barnes
U.S. imposes travel ban from eight African countries over Omicron variant
By Nandita Bose & David Shepardson