What's sneaky, super contagious and bound to cause diarrhea and vomiting? If you answered "norovirus," you'd be correct. But what is it, and why is it so often associated with cruises?

Last year, there were 16 outbreaks on cruise ships, from norovirus, salmonella, E. coli or other unidentified pathogens that cause gastrointestinal symptoms such as diarrhea or vomiting. That's the largest number of cruise ship outbreaks in 12 years.

Last year was the cruise industry's worst in more than a decade for outbreaks of gastrointestinal illness on ships in the U.S., according to the CDC. December was a particularly bad month.

In 2024, the Centers for Disease Control and Prevention (CDC) in the United States reported a significant increase in norovirus infections.

A norovirus outbreak aboard the P&O Cruises' Arcadia ship last fall left dozens of passengers confined to their cabins and is now linked to the death of a 77-year-old British passenger.

Norovirus, often coined the “cruise ship virus,” causes more than 90% of diarrheal disease outbreaks on cruise ships, according to the CDC. Still, norovirus outbreaks on cruise ships account for only a small percentage of all reported norovirus outbreaks.

Passenger dies after norovirus outbreak on P&O cruiseVarious

Cruise ships dealt with worst year of norovirus cases in over a decade, CDC says. (Scripps News) What to Know About Trudeau’s Resignation 25 actors who are great at playing the worst Biden Signs Social Security Fairness Act: When Do Higher Payments Start?

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