This virus is still very, very new to humans, and the virus wants to live, and the way that it lives is by evading immunity - circumventing people's defenses by evolving in a way to keep the chain of infection going.
KP.3.1.1 is most clearly on the rise... comprised 17.7% of samples nationwide, up from 6.8% for the prior two-week period, according to estimates from the U.S. Centers for Disease Control and Prevention.
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