Since Omicron became the world’s dominant Covid variant, it’s taken on a lot of shapes. First there was BA.1, then BA.5, and eventually others, including BQ.1 and BQ.1.1. Now all eyes are on another scrambled string of letters and numbers—XBB.1.5, also known as the Kraken, which has swept the northeastern US in recent weeks.The World Health Organization...
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