Team MD | Last Updated: July 2, 2026
A norovirus outbreak aboard the Ruby Princess has left 125 passengers and crew members ill, prompting an investigation by the U.S. Centers for Disease Control and Prevention (CDC) and enhanced sanitation measures by Princess Cruises.
According to the CDC, 102 passengers and 23 crew members reported symptoms of gastrointestinal illness during the voyage, which carried 3,032 passengers and 1,144 crew members. Health officials identified norovirus as the suspected cause of the outbreak, one of the most common viruses responsible for acute gastroenteritis.
Princess Cruises said it immediately implemented its outbreak response plan after the increase in illness was detected onboard. The cruise line enhanced cleaning and disinfection across the ship, isolated symptomatic passengers and crew, and worked closely with the CDC’s Vessel Sanitation Program as the investigation continued.
The CDC said the most commonly reported symptoms included diarrhoea, vomiting, nausea and stomach cramps. While most infections resolve within a few days without medical treatment, the virus can cause severe dehydration in older adults, young children and people with weakened immune systems.
The Ruby Princess outbreak is one of several gastrointestinal incidents reported on cruise ships this year. Public health officials say norovirus remains the leading cause of cruise-related stomach illness because it spreads easily in shared environments through contaminated food, surfaces and close personal contact.
Officials have not announced any travel restrictions, and Princess Cruises said it completed additional sanitation procedures before the vessel’s next sailing. The CDC continues to review the outbreak and monitor the effectiveness of the control measures implemented onboard.
Health experts recommend that cruise passengers wash their hands frequently with soap and water, report symptoms promptly to onboard medical staff and avoid close contact with others if they become ill. Early reporting and strict hygiene remain the most effective ways to reduce the spread of norovirus in enclosed environments.
The CDC is expected to publish further updates if additional cases are identified or if new findings emerge from the ongoing investigation.