The U.S. Centers for Disease Control & Prevention (CDC) calls norovirus "very contagious." It spreads through contact with food, water, contaminated surfaces, or an infected person. Stomach cramps, diarrhea, nausea, and vomiting are all common symptoms. At last year's world athletics championship in London, a norovirus outbreak sidelined several athletes after the disease spread through a hotel, according to a report by Reuters.
Organizers are moving quickly alongside Korean authorities to sanitize any area that's potentially been exposed.
“All areas are getting disinfected," Olympic Games Executive Director Christophe Dubi said. "[Organizers] will be extremely diligent to sanitize anything that came into contact with the persons. Very stringent measures are in place when it comes to food and beverage,”