Why scientists are tracking BA.2, a stealth subvariant of Omicron that's on the rise January 26, 2022 Unlocking the mysteries behind Omicron's unique set of mutations will be key to understanding how this virus evolves and spreads — particularly as a tougher-to-detect subvariant called BA.2 is taking off in various countries. Labels: CBC | Health News health Share to: Twitter Facebook URL Print Email
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