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COVID-19: BA.4, BA.5 subvariants cause of spike in cases in West Bengal, say experts
Explained: A more contagious version of COVID-19 Omicron variant takes over; what's known about BA.2?
WHO warns against new mutant 'XE' variant of Omicron; says more transmissible than any strain of COVID-19
COVID-19 makes a comeback in parts of northeastern US, BA.2 variant becomes dominant in the country
Omicron subvarient BA.2: Here's all you need to know
Omicron is a 'highly divergent' variant which has reduced the protection of antibodies from both prior infection and vaccination, and increased transmissibility
