EuroWire, WASHINGTON: The U.S. Centers for Disease Control and Prevention has reported a norovirus outbreak aboard the cruise ship Rotterdam operated by Holland America Line, following a voyage that ran from December 28, 2025, to January 9, 2026. The outbreak was reported to the CDC’s Vessel Sanitation Program on January 8, 2026, while the ship was still sailing. The agency disclosed the incident as part of its routine public health monitoring of cruise vessels that operate itineraries including U.S. ports.
According to the CDC’s final case counts, 85 of the ship’s 2,593 passengers reported symptoms of acute gastrointestinal illness during the voyage, representing approximately 3.3 percent of those onboard. Among crew members, 9 out of 1,005 individuals reported illness, accounting for about 0.9 percent of crew. The CDC said the most commonly reported symptoms were vomiting and diarrhea. Laboratory analysis confirmed norovirus as the causative agent responsible for the outbreak.
The Rotterdam is one of Holland America Line’s largest ships and was operating a multi-day cruise during the peak holiday travel period. The CDC did not release details regarding the ship’s ports of call or where exposure may have occurred. Under federal guidelines, the agency’s reporting focuses on illness surveillance, case counts, and response measures rather than itinerary specifics or individual passenger information.
The CDC said the cruise line and ship’s crew implemented outbreak response procedures after an increase in reported illnesses was identified. These measures included isolating passengers and crew members who reported symptoms, intensifying cleaning and disinfection protocols in cabins and public areas, and collecting stool samples from affected individuals for laboratory testing. The agency said the ship’s medical and operational teams coordinated closely with the Vessel Sanitation Program throughout the response.
CDC outlines cruise ship illness reporting requirements
The Vessel Sanitation Program monitored the outbreak response remotely while the ship remained at sea. The CDC said remote monitoring allows public health officials to review illness reports, evaluate sanitation practices, and provide guidance in real time when vessels are not immediately accessible for onboard inspections. This approach is part of standard protocol during active voyages and is intended to support timely implementation of infection control measures.
Norovirus is a highly contagious virus and a leading cause of gastrointestinal illness worldwide. It spreads through direct contact with infected individuals, contaminated food or surfaces, and exposure to virus particles in close-contact environments. Cruise ships are required under U.S. public health regulations to report gastrointestinal illness cases that meet specific thresholds, enabling early detection and response to potential outbreaks.
The Vessel Sanitation Program operates under the CDC to help prevent and control the spread of gastrointestinal illnesses on cruise ships. The program conducts routine sanitation inspections, reviews outbreak reports, and provides technical guidance to cruise operators. Ships that fail to meet sanitation standards can be subject to corrective actions, and inspection scores are made publicly available as part of the program’s transparency framework.
No hospitalizations reported by CDC
The CDC said no hospitalizations or deaths were reported in connection with the Rotterdam outbreak. The agency added that the incident was managed using established public health procedures in coordination with the cruise line and shipboard medical staff. The publication of outbreak information, the CDC said, is intended to inform the public and provide standardized data on health events aboard cruise vessels operating under U.S. jurisdiction.
The CDC continues to monitor gastrointestinal illness reports from cruise ships through the Vessel Sanitation Program and updates its public records as investigations are completed. The agency advises travelers to practice regular hand hygiene and report symptoms promptly to onboard medical staff to support early response efforts during voyages.