Overview

• The CDC Vessel Sanitation Program recorded twelve norovirus outbreaks on ships by mid-May, nearly matching the fifteen logged in all of 2024.
• Health experts point to low population immunity against a new circulating norovirus variant as a key factor in the surge.
• Shared buffets, cabins and restrooms on cruise vessels create ideal conditions for rapid virus transmission.
• In March, a norovirus incident on the Queen Mary 2 infected 266 of 2,538 passengers, illustrating the pathogen’s swift spread.
• Cruise operators have intensified sanitation measures and isolated symptomatic travelers to prevent further outbreaks.