• Twenty-one passengers and six crew members fell ill with gastrointestinal symptoms
• The Seven Seas Mariner was traveling from Miami to Honolulu during the outbreak
• The CDC listed the official cause of the illness as unknown
• Regent Seven Seas Cruises implemented heightened disinfection and guest isolation protocols

A total of 27 individuals reported gastrointestinal symptoms during a recent voyage aboard the Regent Seven Seas Cruises vessel, Seven Seas Mariner. According to data provided by the Centers for Disease Control and Prevention, the affected group included 21 passengers and six crew members out of the 631 guests on board. The primary symptom reported by those ill was diarrhea, though the specific causative agent of the outbreak remains unidentified by health officials at this time.

The voyage in question took place between January 11 and February 1, 2026. The itinerary involved a transit from Miami to Honolulu, including scheduled stops at various ports in Mexico, Guatemala, and Costa Rica. This incident represents the first gastrointestinal outbreak of the year to meet the federal threshold for public notification. For context, federal records show 23 such outbreaks occurred in 2025, with the majority attributed to norovirus.

In response to the illness, the luxury cruise line implemented several protocols to mitigate further transmission. These measures included intensified cleaning and disinfection routines throughout the ship and the isolation of symptomatic guests and crew members in their quarters. While cruise ships are frequently highlighted in reports of such outbreaks, health experts note that these environments represent a small fraction of total cases. Similar incidents often occur in other high-density settings like nursing homes and childcare facilities but receive more attention in the maritime sector due to rigorous reporting requirements. The cruise line has not yet issued a formal statement regarding the specific circumstances of this voyage, but the CDC continues to monitor health and safety standards across the industry to ensure passenger wellbeing.