Overview
- During the July 4–11 voyage from Los Angeles to Mexico, 134 of 3,914 passengers and seven of 1,266 crew members reported vomiting, abdominal cramps and diarrhea.
- The CDC’s Vessel Sanitation Program is monitoring the situation remotely and has collected stool specimens as health officials work to identify the unknown pathogen.
- Royal Caribbean activated its outbreak response plan by isolating affected individuals and stepping up cleaning and disinfection protocols onboard.
- This marks the 18th cruise ship gastrointestinal outbreak in 2025 to meet CDC notification criteria, matching last year’s total as a new norovirus strain gains ground.
- Experts say cruise cases follow land-based norovirus trends and that pinpointing the causative agent can take weeks of laboratory analysis.