Omicron subvariant BA.2 raises new questions about puzzling evolution of virus behind COVID-19

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https://i.cbc.ca/1.6327447.1643158447!/fileImage/httpImage/image.jpg_gen/derivatives/16x9_460/omicron-close-ups.jpg 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.


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