BA.2 Omicron
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WHO analyzing 2 new Omicron COVID-19 sub-variants: BA.4 and BA.5The WHO said it had begun tracking them because of their "additional mutations that need to be further studied to understand their impact on immune escape potential."WorldApr 11, 2022
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Canada has detected BA.2 cases. What we know about this Omicron subvariantThe BA.2 sub-lineage appears to be more contagious than the original Omicron variant and is harder to detect in a PCR test, experts say.CanadaJan 25, 2022
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