Cruise ships under CDC jurisdiction had 16 stomach bug outbreaks in 2024, most

The cruise industry is facing a significant health challenge as the U.S. Centers for Disease Control and Prevention (CDC) reports a rise in stomach bug outbreaks. In 2024, the CDC’s Vessel Sanitation Program documented 16 outbreaks of gastrointestinal illnesses, marking the highest number since 2012. This alarming trend has raised concerns among passengers and health officials alike. Norovirus, a highly contagious virus known for causing severe gastrointestinal distress, was the primary culprit in most of these outbreaks.

Norovirus: The Leading Cause of Outbreaks

Norovirus has emerged as the most prevalent pathogen affecting cruise ships, accounting for 13 of the 16 reported outbreaks. This virus is notorious for its rapid spread and can lead to severe symptoms, including vomiting, diarrhea, muscle aches, headaches, fevers, and abdominal cramps. According to the CDC, norovirus is responsible for over 90% of all diarrheal outbreaks on cruise ships.

The situation has been particularly concerning in December 2024, when five outbreaks were recorded, all linked to norovirus. Notably, the Cunard Lines ship, Queen Mary 2, experienced two back-to-back outbreaks within a week. The first outbreak affected 138 of 2,430 passengers and 12 of 1,237 crew members. The second outbreak was even more severe, impacting 326 of 2,565 passengers and 65 of 1,233 crew members. These incidents highlight the challenges of managing outbreaks in environments where close quarters and shared dining areas facilitate the virus’s spread.

2024 was worst year for stomach virus outbreaks on cruise ships in decade: CDC

Challenges of Containing Outbreaks on Cruise Ships

While norovirus outbreaks on cruise ships often attract media attention, it is essential to note that only about 1% of all norovirus outbreaks occur on these vessels. However, the unique conditions aboard cruise ships make controlling such outbreaks particularly difficult. The close living quarters and communal dining areas create an environment where pathogens can easily spread among passengers and crew.

In addition to the Queen Mary 2, Royal Caribbean’s Radiance of the Seas also reported two stomach bug incidents in 2024. This ship experienced a Salmonella outbreak from September 20 to September 27, followed by a norovirus outbreak from April 8 to April 22. These incidents underscore the ongoing risk of gastrointestinal illnesses in the cruise industry.

Health officials continue to emphasize the importance of hygiene and sanitation on cruise ships to mitigate the risk of outbreaks. Passengers are encouraged to practice good hand hygiene and report any symptoms of illness promptly. As the cruise industry navigates these challenges, the health and safety of passengers remain a top priority.