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Monday, November 9, 2026Nov 9

Experts: Cruise ships no place for a coronavirus quarantine

In this Thursday, March 5, 2020, photo, released by the California National Guard, Guardian Angels, a group of medical personnel with the 129th Rescue Wing, working alongside individuals from the Centers for Disease Control and Prevention, don protective equipment after delivering virus testing kits to the Grand Princess cruise ship off the coast of California. Passengers on a cruise ship off the California coast were instructed to stay in their cabins as they awaited test results Friday that could show whether the coronavirus is circulating among the more than 3,500 people aboard. (Chief Master Sgt. Seth Zweben/California National Guard via AP)
In this Thursday, March 5, 2020, photo, released by the California National Guard, Guardian Angels, a group of medical personnel with the 129th Rescue Wing, working alongside individuals from the Centers for Disease Control and Prevention, don protective equipment after delivering virus testing kits to the Grand Princess cruise ship off the coast of California. Passengers on a cruise ship off the California coast were instructed to stay in their cabins as they awaited test results Friday that could show whether the coronavirus is circulating among the more than 3,500 people aboard. (Chief Master Sgt. Seth Zweben/California National Guard via AP) In this Thursday, March 5, 2020, photo, released by the California National Guard, Guardian Angels, a group of medical personnel with the 129th Rescue Wing, working alongside individuals from the Centers for Disease Control and Prevention, don protective equipment after delivering virus testing kits to the Grand Princess cruise ship off the coast of California. Passengers on a cruise ship off the California coast were instructed to stay in their cabins as they awaited test results Friday that could show whether the coronavirus is circulating among the more than 3,500 people aboard. (Chief Master Sgt. Seth Zweben/California National Guard via AP)

Cruise ships hit by coronavirus outbreaks have quickly found themselves with no ports for thousands of passengers as countries on four continents have quarantined vessels or kept them at sea for days.

Keeping all of the passengers on board instead of letting them disembark on land is a strategy that can backfire, however, according to experts, because the ventilation systems and close quarters of cruise ships make them ideal places for illness to jump from one person to the next.

“They’re not designed as quarantine facilities, to put it mildly,” said Don Milton, an epidemiologist with the University of Maryland.

A ship with about 3,500 people aboard was sailing in circles off the coast of California on Saturday after 19 crew members and two passengers tested positive for the new virus. Originally bound for San Francisco, the Grand Princess might be sent instead to a non-commercial port, officials said.

While restaurants and other shipboard locations were closed, passengers were able to watch TV and use the internet, or if they were lucky enough to have one, go outside on their balcony overlooking the water.