The Centers for Disease Control and Prevention has taken a significant step forward in addressing one of the most persistent—and often misunderstood—public health risks in maritime travel: Legionnaires’ disease. In March 2026, the CDC updated its Vessel Sanitation Program (VSP) standards, marking a fundamental shift in how cruise ships must manage their onboard water systems. This is not just a regulatory tweak. It represents a structural change in how disease prevention is approached at sea From Outbreak Response to Prevention Historically, cruise ship health protocols have focused heavily on reactive measures, particularly in response to outbreaks of illnesses like norovirus.…