Cruise ships are designed to provide a convenient and luxurious holiday experience, but they also create a unique environment that can facilitate the spread of diseases. The close quarters, shared dining and living spaces, and reliance on indoor air circulation systems make it easy for illnesses to spread quickly.
From COVID-19 to norovirus, legionnaires' disease, and hantavirus, cruise ships have been the site of numerous outbreaks over the years. The Diamond Princess outbreak in 2020 is a prime example, with 619 passengers and crew testing positive for COVID-19.
The design of cruise ships, including shared dining areas, buffets, and crowded indoor spaces, makes it easy for stomach bugs like norovirus to spread. Food service plays a big part in this risk, as shared utensils and many people touching the same surfaces can contaminate food and surfaces.
Crew members also live and work in the same environment, often in shared accommodation, which can facilitate the spread of illness from passenger to passenger or between passengers and crew.
Ventilation also plays a crucial role in the spread of disease on cruise ships. Studies have shown that illness can spread more easily in crowded, enclosed spaces if the ventilation system is not up to scratch.
Legionnaires' disease, on the other hand, is typically spread through contaminated water systems, hot tubs, or showers. A well-known outbreak among cruise passengers was linked to a whirlpool spa, and recent reports have described other cruise-associated legionnaires' disease outbreaks linked to ship water systems.
Age also matters, as cruise holidays are especially popular with older adults, who may have long-term health conditions that make infections more serious. A stomach bug on a cruise can lead to dehydration, and a respiratory infection can lead to pneumonia or hospital care.
Cruise ships do have medical facilities, but they are limited compared with land-based hospitals. They are built to give first aid, basic treatment, and short-term care, not to manage a fast-moving outbreak on a large scale.
To limit your risk, check whether the cruise line has clear illness reporting, cleaning, and isolation policies. Make sure your routine vaccines are up to date, and consider consulting your GP before travelling if you have health problems.
