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

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... Cruise holidays are especially popular with older adults, and many passengers 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.

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 Health authorities work to contain cruise ship hantavirus outbreak

New World hantaviruses, such as the one causing the outbreak on the Hondius, occur in North and South America. The best-known strains of this type are the Andes virus, the strain that was confirmed in the cruise ship outbreak, and the Sin Nombre virus, which likely caused the death of Betsy Arakawa, Gene Hackman’s wife, in March 2025. These viruses generally affect the lungs and are fatal in about 40% of cases. Symptoms start with a flu-like illness and can progress quickly to intense inflammation in the lungs that leads to lung and heart failure.

Articles of Interest

A Viral Misery That Loves Company

I have often felt sorry for people whose cruise ship vacations were marred by a nasty gastrointestinal virus that kept them quarantined in their cabins and sometimes cut short the trip. But now that I’ve endured two separate bouts of this bug, formerly called Norwalk virus and now known as norovirus, my empathy has skyrocketed. Norovirus is, to put it mildly, misery incarnate. One minute you’re fine, and the next you think you’re dying — or that dying would be preferable.

Everything You Need - But Don't Want - To Know About Getting Sick on a Cruise Ship

On the face of it, it’s not hard to see why cruise ships are ideal breeding grounds for GI illnesses like norovirus to thrive and multiply.

Here's the Best Way to Protect Yourself from a Norovirus Outbreak

It's a vacation nightmare: You board a cruise ship for a weeklong getaway, only to have an outbreak of norovirus, or a "stomach bug," take the ship by storm. But aside from barricading yourself in your cabin, what's the best way to protect yourself in the midst of a norovirus outbreak?

How To Avoid Norovirus And Other Outbreaks On A Cruise Ship

So what precautions can you take to avoid getting sick on a cruise? Keep in mind that going on a cruise doesn't necessarily put you at higher risk for getting a GI illness or other diseases compared to many more regular activities such as going to a restaurant, a party, school, work, or a day care center.

Preventing norovirus: your cruise vacation's biggest health threat

Although the cases of norovirus striking ships are very high profile, with proper sanitary procedures your chances of an outbreak are still very low.