The U.S. State Department has issued an updated travel warning for American citizens considering travel by cruise ship.

“U.S. citizens, particularly travelers with underlying health conditions, should not travel by cruise ship,” the State Department has said in a statement posted to its website on Sunday, March 8.

“CDC notes increased risk of infection of COVID-19 in a cruise ship environment. In order to curb the spread of COVID-19, many countries have implemented strict screening procedures that have denied port entry rights to ships and prevented passengers from disembarking. In some cases, local authorities have permitted disembarkation but subjected passengers to local quarantine procedures. While the U.S. government has evacuated some cruise ship passengers in recent weeks, repatriation flights should not be relied upon as an option for U.S. citizens under the potential risk of quarantine by local authorities.

“This is a fluid situation. CDC notes that older adults and travelers with underlying health issues should avoid situations that put them at increased risk for more severe disease. This entails avoiding crowded places, avoiding non-essential travel such as long plane trips, and especially avoiding embarking on cruise ships.”