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The cleanest cruise ships have been revealed in a new study - and some of the findings may surprise cruise lovers.
The study, which compiled data from the Centers for Disease Control and Prevention's (CDC) annual health and hygiene inspections, ranked a number of popular cruise lines as the most sanitary.
"The data shows that independent brands tend to score higher than large conglomerates, and, surprisingly, the age of the ship doesn't appear to influence a cruise line's ability to achieve a perfect score," according to the study by Florida-based Squaremouth Travel Insurance.
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Cruise ships were graded on a 100-point scale. To pass inspection, ships must score 86 or above.
The Viking Ocean Cruises II Ltd., Viking Expedition Operations and Crystal Cruises were tied as the cleanest cruise lines, according to the study. Each cruise line scored a 99 out of 100.
"The federal government's Vessel Sanitation Program (VSP), established in 1975 to work with the cruise industry to protect travelers' health, is critical for the health and safety of passengers, staff and the locations that cruise ships visit," Gavin Macgregor-Skinner, an infection prevention expert and epidemiologist, told Fox News Digital.
Oceania Cruises, P&O Cruises, Japan Grace, Virgin Voyages, Norwegian Cruise Lines, Celebrity Cruises and Royal Caribbean International completed the top 10 cleanest cruise line list.
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Royal Caribbean's Adventure of the Seas ship, which premiered in 2001, ranked high in the CDC's list - proving that age is not necessarily linked to cleanliness.
All the ships in the top 10 scored higher than 97.12.
"Ships participating in the VSP can expect two unannounced inspections every year, with a focus on medical facilities, potable water systems, swimming pools and whirlpool baths, galleys and dining rooms, child activity centers, cabins, ventilation systems and common areas," Macgregor-Skinner said.
Viking, Virgin and Norwegian were the corporations that ranked the highest, with sanitation scores of 98.75, 97.67 and 97.39, respectively, according to the study.
Disney was No. 4 in the list of corporations - averaging a 97.
Royal Caribbean and Carnival had average sanitation scores of 96.74 and 94.82, respectively.
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Viruses can spread quickly on a cruise ship.
But the CDC implements strict cleaning protocols for all vessels.
"Cruise ships are shared environments where thousands of people touch the same surfaces every day," Brian Sansoni, senior vice president of communications at the American Cleaning Institute in Washington, D.C., told Fox News Digital.
"Without strong cleaning and hygiene practices, germs can spread quickly, increasing the risk of illness among passengers and crew," he continued.
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Surprisingly, the study found no link between viruses and the lack of cleanliness.
Cruise ships are often ravaged by norovirus and other gastrointestinal illnesses. In 2025, the CDC reported 23 onboard outbreaks, according to the study.
However, "the data shows no correlation between the number of onboard viral outbreaks and sanitation scores, proving that viral illness can easily spread on the cleanest of ships," the study said.
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Macgregor-Skinner said cruise lines are the only part of the travel sector that routinely report illnesses to the federal government.
"It is very important not to confuse the wider availability of cruise health data with a higher incidence rate on cruise ships compared to settings like restaurants, hotels and planes," Macgregor-Skinner said.
Overall, the cruise industry is actually cleaner than other travel sectors, he said.
Nevertheless, Sansoni asserted, "Inadequate cleaning can allow viruses and bacteria to linger on high‑touch surfaces like railings, elevator buttons and bathroom fixtures. When cleaning protocols break down, those germs can spread rapidly in close quarters."
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According to the study, here are the top 10 cleanest cruise lines.
Viking Ocean Cruises
Viking Expedition Cruises
Crystal Cruises
Oceania Cruises
P&O Cruises
Japan Grace
Virgin Voyages
Norwegian Cruise Line
Celebrity Cruises
Royal Caribbean International
