NPR News: JN.1 takes over as the most prevalent COVID-19 variant. Here's what you need to know

JN.1 takes over as the most prevalent COVID-19 variant. Here's what you need to know
The CDC estimates that up to 86% of new COVID-19 cases stem from the latest mutation. The virus continues to evolve so rapidly that "our immune systems have not been able to keep up," an expert says.

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