Around 400 vacationers and crew members aboard two Christmas-time cruises in the Caribbean have been diagnosed with a gastrointestinal illness.
Two ships, Cunard's Queen Mary 2 and Princess Cruises' Emerald Princess, have reported the outbreak to the US Centers for Disease Control (CDC).
The CDC said today that lab tests were being conducted to determine the pathogen, but early signs indicate that illness is Norovirus.
According to AFP, over 194 passengers and 11 crew members of the more than 3800 people on board the Queen Mary 2 have reported feeling ill.
While 189 passengers and 31 crew members on the Emerald Princess, which docked on December 27, had fallen ill.
The public health agency said both liners had taken steps to restrict the outbreak.