We’re Living the Reality of the Pandemic’s Simplest Math

Last fall, when RSV and flu came roaring back from a prolonged and erratic hiatus, and COVID was still killing thousands of Americans each week, many of the United States’ leading infectious-disease experts offered the nation a glimmer of hope. The overwhelm, they predicted, was probably temporary—viruses making up ground they’d lost during the worst of the pandemic. Next year would be better.

And so far, this year has been better. Some of the most prominent and best-tracked viruses, at least, are behaving less aberrantly than they did the previous autumn. Although neither RSV nor flu is shaping up to be particularly mild this year, says Caitlin Rivers, an epidemiologist at the Johns Hopkins Center for Health Security, both appear to be behaving more within their normal bounds.