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Is the BA.2 sub-variant of omicron cause for concern?
COVID-19: What we know so far about Omicron's BA.2 subvariant
Omicron subvariant BA.2 spreading: How concerned should Americans be?
New Omicron subvariant not 'a cause for concern,' doctor says
Omicron sub-variant BA.2 explained
Explaining the BA.2 subvariant of omicron
Omicron subvariant BA.2 increasing in Canada and around the world
What We Know About the Omicron Subvariant
As scientists monitor new omicron subvariant BA.2, here's what we know
Omicron BA.2 sub-variant causing COVID resurgence in China, Europe
Rise in Omicron subvariant BA.2 cases coinciding with allergy season
As Omicron Surge Plateaus, New Concerns About Another Sub-Variant Emerge