New Covid variant BA.3.2 detected across US, but experts urge vigilance over alarm

Strain found in 29 states and Puerto Rico carries spike mutations, but no data shows increased severity

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BA.3.2, an Omicron variant of Covid-19 with dozens of new spike mutations, has been detected in 29 US states and Puerto Rico, according to the Centers for Disease Control and Prevention, but experts say there is not yet evidence it is more severe than other recent variants.

“The right response to BA.3.2 is serious attention, not alarm,” says Dr Jake Scott, a Stanford professor and infectious disease expert who authored a systematic review of Covid vaccines for the New England Journal of Medicine.