has surpassed JN.1 to become the dominant strain in the US, CDC data shows.
Mandatory Credit:	Spencer Platt/Getty Images via CNN Newsource

has surpassed JN.1 to become the dominant strain in the US, CDC data shows.
Mandatory Credit: Spencer Platt/Getty Images via CNN Newsource

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New virus variants threaten a summer Covid-19 wave, but experts say the risk remains uncertain

Covid-19 levels are about the lowest they’ve ever been in the United States, but another new crop of virus variants once again threatens to disrupt the downward trend as the country heads into summer.