A newer strain of norovirus, called GII.17[P17] makes up the majority of outbreaks nationwide, according to CDC data.

M Health Fairview said its hospitals are crowding due to what it called a "quad-demic," an influx of influenza, RSV, COVID-19 and norovirus cases.

Norovirus infections can occur at any time of year, but they tend to peak during the colder winter months—that happens every ...