Norovirus outbreak sickens dozens aboard Royal Caribbean cruise

In late September 2025, a significant norovirus outbreak affected passengers on Royal Caribbean's Serenade of the Seas, which had embarked on a two-week voyage from San Diego, California, on September 19. The Centers for Disease Control and Prevention (CDC) reported that out of 1,874 passengers, 71 were experiencing symptoms, along with one of the 883 crew members. Symptoms included diarrhea and vomiting, which are characteristic of norovirus infections. Royal Caribbean promptly reported the outbreak to the CDC's Vessel Sanitation Program on September 28, initiating a series of health and safety protocols aboard the ship. As the vessel was approaching its final destination of PortMiami, officials from the CDC closely monitored the situation, evaluating the cruise line's response strategies and increasing sanitation efforts. Royal Caribbean stated that they implemented enhanced cleaning measures and isolated affected passengers and crew members to contain the spread of the virus. The emphasis on rigorous cleaning practices was reiterated by the cruise line, which noted their commitment to providing a safe environment for all guests and crew members. The incident is part of a broader trend affecting the cruise industry, where outbreaks of gastrointestinal illnesses like norovirus are frequently reported. The CDC mandates that such outbreaks be reported when 3% or more of a ship's passengers or crew exhibit symptoms. In fact, earlier in the summer of 2025, a similar shorewide outbreak was documented when over 140 individuals fell ill aboard another Royal Caribbean vessel, Navigator of the Seas, highlighting persistent challenges the industry faces regarding gastroenteric health on cruise ships. While norovirus is usually contracted through contaminated food, water, or surfaces, it is especially potent in closed environments like cruise ships where close quarters can facilitate rapid virus transmission. Officials encourage immediate reporting of gastrointestinal symptoms to help with tracking and managing outbreaks effectively. The engagement of health authorities and the cruise line industry in quick responses and communication can help alleviate public concern, although many passengers remain wary of health risks when embarking on cruise vacations.