CDC Investigates Repeated Norovirus Illnesses on Alaska Cruise Ship
Key Aspects:
The CDC sent investigators aboard Lindblad Expeditions’ National Geographic Sea Bird after repeated norovirus illnesses.
Two reported outbreaks have sickened 32 passengers and crew members combined.
Federal and Alaska health officials are working with the ship to contain the outbreak and prevent additional cases.
The US Centers for Disease Control and Prevention (CDC) has expanded its response to repeated norovirus illnesses aboard a Lindblad Expeditions ship after cases persisted across multiple Alaska voyages.
The CDC’s Vessel Sanitation Program (VSP) reported that 19 of the 68 passengers aboard the National Geographic Sea Bird became ill during a June 25 through June 30, 2026, voyage. One of the ship’s 27 crew members also reported symptoms.
The outbreak was reported to the CDC on June 28, 2026, with nearly 28 percent of passengers becoming ill, well above the agency’s reporting threshold. Cruise ships are required to notify health officials when at least 3 percent of passengers or crew develop gastrointestinal illness during a voyage.
The June voyage marked the second voyage this season for which the CDC has published a formal outbreak report involving the vessel. The first covered a May 26 through 31, 2026, voyage, during which 9 of 66 passengers and 3 of 24 crew members became ill with confirmed norovirus.
Unlike the earlier outbreak, which the agency monitored remotely, the continued illnesses prompted the CDC to send investigators aboard the National Geographic Sea Bird.
“Due to continued cases, VSP conducted a field response for an environmental assessment and outbreak investigation to assist the ship in controlling the outbreak on subsequent voyages,” the CDC said.
The field response also covered two additional voyages that sailed from May 31 through June 5, and June 5 through June 10, 2026, as officials worked to control the outbreak. The agency has not released illness counts for those voyages, making it unclear how many additional people became ill during those sailings.
The agency’s VSP is working closely with the National Geographic Sea Bird and with the Alaska Departments of Health and Environmental Conservation.
How the CDC Responds to Outbreaks
The National Geographic Sea Bird is one of Lindblad Expeditions’ small expedition ships operating in Alaska. The vessel sails 6-day itineraries through the Inside Passage, calling at destinations such as Juneau, Sitka, Ketchikan, Endicott Arm, Wrangell, Haines, and Misty Fjords.
Unlike larger cruise ships, much of the experience revolves around close-knit groups, shared excursions aboard Zodiac boats, and exploring remote wilderness together.
That intimate experience also means passengers spend much of the voyage together, creating more opportunities for contagious illnesses such as norovirus to spread.
According to the CDC, norovirus is the most common cause of gastrointestinal illness. Symptoms usually develop 12 to 48 hours after exposure and can include vomiting, diarrhea, nausea, and stomach cramps.
Some people also experience a fever, headache, or body aches. Most recover within one to three days.
The virus spreads easily through contaminated food or water, by touching contaminated surfaces, or through close contact with someone who is sick. The CDC also notes that people can continue spreading the virus for several days after they begin feeling better, which is one reason outbreaks can sometimes continue from one voyage to the next.
According to the CDC, Lindblad Expeditions has increased cleaning and disinfection aboard the ship, isolated ill passengers and crew members, and continues working with federal and Alaska health officials to help prevent additional cases.
CDC Investigates Repeated Norovirus Illnesses on Alaska Cruise Ship