Hantavirus, COVID, norovirus, legionnaires’: why are cruise ships so prone to disease outbreaks?

By Vikram Niranjan, Assistant Professor in Public Health, School of Medicine, Health Research Institute, University of Limerick

Cruises are sold as floating holidays, but they are also useful for understanding public health. Cruise ships are carefully designed places where many people live, eat, relax and move through the same shared spaces for days at a time. They show how easily illness can spread when people are packed into a single interconnected environment.

Think of a cruise ship as a temporary city at sea. It has restaurants, theatres, lifts, cabins, kitchens, water systems and indoor gathering spaces. That is great for…

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