WHO Tracks Two New Omicron Sub-Variants: What We Know About BA.4 & BA.5 Variants
While several nations are facing a spike in the number of daily Covid-19 cases accelerated by the emergence of the more-transmissible BA.2 omicron strain, two new sub-variants of Omicron – BA.4 and BA.5 – are now under WHO.
The global…
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