A sub-variant of coronavirus known as BA.2 is now dominant worldwide. It represents nearly 86 per cent of all sequenced cases. BA.2 is even more transmissible than its highly contagious Omicron siblings, BA.1 and BA.1.1. It is prompting surges in many countries in Europe and Asia.
Covid: 'Stealth' Omicron variant BA.2 is now globally dominant
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