First came omicron, then came its highly contagious subvariant, BA.2. That subvariant gave rise to its own subvariants, whose share of new coronavirus cases in the United States is growing.The coronavirus is constantly mutating. While some variants seem to vanish, causing little ripples of surges in their wake, others have kept driving large outbreaks.
New subvariant of Covid-19 spreading rapidly in the United States
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