Care for the flu is generally supportive — meaning rest, hydration, and over-the-counter medication, but as the Mayo Clinic points out, if you're in a group at high risk of complications — such as pregnant, older, or asthmatic — you may be prescribed an anti-viral medication such as Tamiflu.

COVID-19, influenza, RSV, and norovirus—have created what experts are calling a "quad-demic" in the U.S. Here's what to know and how to stay well.

Health experts are warning of a 'quad-demic' this winter, as four viral infections spread simultaneously in the UK and US.

This fall saw an unusually high number of cases of “walking” or mycoplasma pneumonia, a mild pneumonia that typically causes a severe cough but less fatigue than more serious forms of the disease.

Viral sicknesses have risen in early 2025 amid the ongoing “quad-demic” in the U.S., referring to three respiratory viruses and one gastrointestinal disease, according to the Centers for Disease Control and Prevention (CDC) data.

After the holiday season and an uptick in travel, California faces a rise in respiratory illnesses, prompting health experts to talk of a “quad-demic.” The term refers to the simultaneous spread of four major viruses: COVID-19,