Norovirus

On Thursday, the Yosemite National Park reported that 170 people had experienced a gastrointestinal illness, and two of them have been confirmed to be a norovirus.

Cruise ship passengers aboard the Marella Explorer 2 reported feeling unwell during their vacation in the Mediterranean Sea.

"They are hand-cleaning every single knob on the climbing wall," one passenger said.

Passengers and sympathizers took to social media to vent their frustrations.

A norovirus outbreak has spread across evacuation shelters for the Camp Fire in California as smoke decreases the air quality to hazardous.

The bathroom taps at the Wood Ponds Beach swimming area failed hygiene tests.

The highly contagious virus sent more than 30 people, most of whom were children, to the hospital.

More than 100 staff members at the Games have been diagnosed with norovirus, a very nasty and very contagious infection.

Holland America was hit especially hard in 2017.

The CDC warns that this wretched stomach bug may be only a few breaststrokes away.