The more the virus is allowed to mosey about, the more chances it will have to mutate and adapt. “Variants are always the wild card,” says Ajay Sethi, an epidemiologist at the University of Wisconsin at Madison. Already, America is watching BA.2—the speedier sister to the viral morph that clobbered the country this winter (now retconned as BA.1)—overtake its sibling and spark outbreaks, especially across the northeast.
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