Key Aspects:
- The CDC reported a gastrointestinal illness outbreak aboard National Geographic Sea Bird, a US-flagged ship.
- Nine passengers and three crew members were affected.
- The cause of the outbreak remains unknown.
Passengers on a small-ship expedition cruise in Alaska got a little more than they bargained for after a gastrointestinal illness spread among guests and crew during a recent sailing.
The Centers for Disease Control and Prevention’s Vessel Sanitation Program reported the outbreak occurred aboard National Geographic Sea Bird, a small expedition vessel carrying 66 passengers and 24 crew members.
The sailing, operated by Lindblad Expeditions, was a 5-night voyage within Alaska’s Inside Passage that took place May 26 through May 31, 2026.
Unlike the large vessels operated by major cruise lines in Alaska, National Geographic Sea Bird sails under the US flag. The vessel is among a relatively small number of American-flagged cruise ships operating in US waters and is able to sail itineraries entirely within Alaska without calling in Canada, as required by most large cruise ships.
Nine passengers and three crew members reported symptoms consistent with acute gastroenteritis, which the CDC defines as three or more loose stools within a 24-hour period or vomiting accompanied by symptoms such as diarrhea, abdominal cramps, headache, muscle aches, or fever.
The outbreak was officially reported on May 28, just two days into the journey that included calls in Sitka, Haines, and the Inian Islands, Alaska, as well as scenic glacier days.
The CDC says samples were not provided by the affected guests or crew members, making it impossible to determine the cause of the outbreak that affected over 13 percent of passengers.
Although norovirus is a common cause of gastrointestinal illness on cruise ships, the cause of this outbreak remains unknown.
Lindblad Expeditions said crew members stepped up cleaning and disinfection efforts after the outbreak was reported. Passengers and crew who became ill were isolated from others onboard to help prevent additional cases.
The outbreak comes during the final season for National Geographic Sea Bird, a vessel that helped establish Lindblad Expeditions’ presence in the expedition cruise market.
A Bustling Opportunity for Illness
The outbreak aboard National Geographic Sea Bird comes during one of Alaska’s busiest cruise seasons on record, with dozens of ships carrying hundreds of thousands of passengers through the region between May and September 2026.
Major cruise lines, including Royal Caribbean, Princess Cruises, Norwegian Cruise Line, Holland America Line, Celebrity Cruises, and several expedition operators, are all sailing Alaska itineraries this summer.
Like hotels and resorts, cruise ships occasionally experience gastrointestinal illness outbreaks. Because passengers share dining rooms, public restrooms, elevators, and other common areas, illnesses can move through a ship more easily once they are introduced.
Health officials remind passengers that one of the most effective ways to protect themselves is frequent handwashing with soap and water, particularly before eating and after using the restroom.
Alcohol-based hand sanitizers can provide an additional layer of protection but are generally less effective against norovirus than proper handwashing.
Passengers who develop symptoms are encouraged to report them immediately to the ship’s medical center, as early reporting allows cruise lines to implement cleaning protocols and help prevent further spread.
This is the fifth US outbreak of 2026 following two norovirus outbreaks on Regent Seven Seas and Oceania Cruises, and two E. coli outbreaks on Princess Cruises.
National Geographic Sea Bird is currently sailing a subsequent 5-night journey in Alaska with no further reports of illness. The vessel will be arriving in Juneau on June 4, 2026.
