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Fortune
Fortune
Lindsey Leake

Public health experts are warning of a ‘quad-demic’ this winter. Here’s where flu, COVID, RSV, and norovirus are spreading

As you dive into your New Year’s resolutions, taking precautions to protect yourself from a quartet of infectious diseases can lessen your odds of starting off 2025 sick. (Credit: gilaxia/Getty Images)

As you dive into your New Year’s resolutions, taking precautions to protect yourself from a quartet of infectious diseases can lessen your odds of starting off 2025 sick.

Flu, COVID, respiratory syncytial virus (RSV), and norovirus are making their winter rounds nationwide, and you may have heard the term “quad-demic” pop up online or in conversation (the first three are sometimes called a “triple-demic”). While the unofficial term for the four maladies circulating in tandem evokes a sense of impending doom, the quadruple threat isn’t so different from respiratory virus seasons past.

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