The first cruise ship to Cuba in decades set sail on its historic voyage a week ago – but it has returned to Florida with a suspected norovirus outbreak on board.

Carnival Corporation’s Fathom Line ship Adonia left Miami for Havana with just over 700 passengers on board on May 1. 

The ship returned to Miami a week later – around 6.30am on Sunday – but on its journey back to the United States, there were reports that several passengers had fallen ill, CBS News reports.  

Carnival confirmed to the station that 14 passengers were recovering from stomach-related symptoms. 

It is believed that the passengers in question had norovirus, CBS reports, but the cruise line has not elaborated.