International cruise pier Cruise ships such as this one, docked at Osanbashi Yokohama International Passenger Terminal in Japan, transform ports into hubs of international movement and tourism. (more) Why Are Cruise Ships Prone to Outbreaks? Written by Kara Rogers Kara Rogers is the senior editor of biomedical sciences at Encyclopædia Britannica, where she oversees a range of content from medicine and genetics to microorganisms. She joined Britannica in 2006 and... Kara Rogers Fact-checked by Britannica Editors Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Britannica Editors Last updated May 11, 2026 •History Cruise ships are especially vulnerable to disease outbreaks because they function as densely populated floating communities, where thousands of passengers and crew members live, eat, and socialize in close proximity for days or weeks at a time. Shared dining areas, elevators, theaters, pools, and cabins create many opportunities for viruses and bacteria to spread quickly through direct contact, inhalation of respiratory droplets, or contact with contaminated surfaces. The continual flow of passengers between ships, ports,...

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