The Centers for Disease Control and Prevention (CDC) is investigating another gastrointestinal (GI) illness outbreak aboard the National Geographic Sea Bird, marking the fourth outbreak reported on the ship since late May. The latest outbreak occurred during a voyage from July 15 to July 20, 2026, raising continued concerns about the spread of stomach illnesses on cruise ships.
The CDC’s Vessel Sanitation Program monitors cruise ships for outbreaks and works with cruise lines to investigate illnesses and reduce further spread.
What Happened on This Voyage?
According to the CDC, 8 of 57 passengers (14%) and 5 of 26 crew members (19%) became ill during the voyage.
The most commonly reported symptoms were:
- Diarrhea
- Vomiting
- Abdominal cramps
Unlike two earlier outbreaks on the same ship that were confirmed to be caused by norovirus, the cause of this latest outbreak has not yet been identified. Laboratory testing is still underway.
What Is Being Done?
After the illnesses were reported, the cruise line took several steps to reduce the spread of disease, including:
- Increasing cleaning and disinfection throughout the ship.
- Isolating sick passengers and crew.
- Working with the CDC on sanitation procedures.
- Pausing passenger operations while the situation is evaluated.
The CDC continues to monitor the outbreak and provide recommendations to help prevent additional illnesses.
Why Do Illnesses Spread on Cruise Ships?
Viruses that cause stomach illnesses, especially norovirus, can spread quickly in places where many people share dining areas, cabins, and common spaces.
People can become infected through:
- Close contact with someone who is sick.
- Touching contaminated surfaces.
- Eating contaminated food.
- Drinking contaminated water.
Frequent handwashing with soap and water is one of the best ways to reduce the risk of infection.
What This Means for Travelers
Most cruise vacations are completed without major health problems, but outbreaks can still occur. If you become sick during a cruise, report your symptoms to the ship’s medical staff right away and avoid participating in group activities until you recover.
Before traveling, it’s also a good idea to review any health notices issued by the CDC and follow good hand hygiene throughout your trip.
Source
Centers for Disease Control and Prevention. National Geographic Sea Bird — July 15–20, 2026 Gastrointestinal Illness Outbreak. Available from: https://www.cdc.gov/vessel-sanitation/cruise-ship-outbreaks/national-geographic-sea-bird-july-2026.html. Accessed July 28, 2026.
Centers for Disease Control and Prevention. Outbreaks on Cruise Ships in VSP’s Jurisdiction. Available from: https://www.cdc.gov/vessel-sanitation/cruise-ship-outbreaks/index.html. Accessed July 28, 2026.
