Norovirus Outbreak on Oceania Cruises’ Ship Insignia – October 2025

An outbreak of norovirus occurred aboard the Oceania Cruises vessel Insignia during an 11-night voyage from Montreal to Boston in October 2025. A total of 75 cases of gastrointestinal illness were reported, affecting 74 passengers (approximately 11.6% of the 637 guests onboard) and one crew member. The outbreak prompted immediate activation of U.S. Centers for Disease Control and Prevention (CDC)-approved sanitation and containment protocols.

The vessel departed Montreal on 16 October 2025, with symptoms of gastroenteritis emerging mid-voyage. The voyage concluded in Boston on 27 October 2025. The CDC's Vessel Sanitation Program (VSP) monitored the outbreak remotely and reviewed the ship's adherence to containment procedures throughout the voyage and upon arrival.

Symptoms of gastroenteritis, including vomiting and diarrhoea, emerged mid-voyage and prompted immediate response measures. The ship's Sanitation Officer led the outbreak response, implementing enhanced cleaning and disinfection of public spaces, isolating symptomatic guests and crew, and maintaining routine reporting to the CDC's Vessel Sanitation Program. Medical staff monitored affected individuals throughout the remainder of the voyage.

Passengers

• 637 onboard; 74 affected by gastrointestinal illness (approximately 11.6%).

Crew

• 1 crew member affected by gastrointestinal illness.

Fatalities

• None reported.

Injuries

• 75 cases of gastrointestinal illness (nausea, vomiting, abdominal pain, diarrhoea) reported; symptoms typically lasted one to three days.

Rescued

• Not applicable; all passengers and crew remained onboard and voyage completed as scheduled.

Oceania Cruises activated CDC-approved sanitation protocols immediately upon identification of the outbreak. Enhanced cleaning and disinfection of public spaces were implemented, symptomatic guests and crew were isolated, and medical staff monitored affected individuals. The CDC's Vessel Sanitation Program maintained remote oversight throughout the voyage and reviewed the ship's adherence to containment and sanitation procedures. VSP officials evaluated post-arrival sanitation once the vessel docked in Boston.

Norovirus is a highly contagious pathogen known for rapid transmission in enclosed environments such as cruise ships. Common symptoms include nausea, vomiting, abdominal pain, and diarrhoea, typically lasting one to three days. The virus spreads primarily through contaminated food, water, or surfaces, and infected individuals can remain contagious even after symptoms resolve. This outbreak marks one of several gastrointestinal outbreaks reported in 2025 under the CDC's VSP monitoring framework.