The cruise industry continues to balloon — with ever bigger, ever wilder boats and some 37.1 million cruise passengers set to take to the waters in 2025, according to industry body Cruise Lines International Association (CLIA).

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.

It seems illnesses on cruise ships hit a 12-year high in 2024, according to the Centers for Disease Control and Prevention (CDC). The recently released CDC data reveals that most

There have been at least 16 outbreaks of gastrointestinal illness on cruise ships this year, the CDC says, the most in over a decade.

(CNN) - Illnesses on cruise ships have hit a 12-year high. New data from the Centers for Disease Control and Prevention show there were outbreaks on 16 different cruise ships in 2024. The majority of the illnesses were norovirus cases. More than 2,000 passengers and crew were impacted.

The Centers for Disease Control and Prevention says reported illnesses on cruise ships have hit a 12-year high.