what is Omicron variant BA.2
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Explanation:
Rather than a daughter of the Omicron variant BA.1 (or B.1.1.529), it is more helpful to think of BA.2 as Omicron’s sister.
Viruses, and particularly RNA viruses such as SARS-CoV-2, make lots of mistakes when they reproduce. They cannot correct these mistakes, so they have a relatively high rate of errors, or mutations and are constantly evolving.