CDC: 222 People at the Grand Canyon Got Sick With ‘Explosive’ Symptoms

The Centers for Disease Control and Prevention headquarters in Atlanta, Ga., on April 23, 2020. Tami Chappell/AFP via Getty Images

The Centers for Disease Control and Prevention (CDC) said that a possible norovirus outbreak sickened at least 222 people who visited Grand Canyon National Park in Arizona.

“At least 222 rafters and backpackers became infected, probably with norovirus,” said the agency in a recent update. “Strong partnerships with river outfitters and National Park staff members enabled implementation of prevention and control measures.”