An investigation by U.S. Centers for Disease Control's Vessel Sanitation Program revealed that 163 out of 921 passengers onboard (more than 17% of passengers) reported falling ill, with 6 out of 518 crew members also falling ill.
On April 30 and May 1, two environmental health officers from Vessel Sanitation Program boarded Balmoral in Baltimore to carry out health assessments. The Fred. Olsen's ship was then cleared by the CDC and continued to New York City, where it's currently docked.
On April 29, during a press conference held when the ship docked in Norfolk, the captain told reporters that ill cruisers were asked to stay in their cabins and that the ship didn't dock in Bermuda because of the illness.
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A statement from Fred. Olsen Cruise Lines read:
"There are currently just six guests in isolation, out of a total of 1,434 guests and crew onboard, and the incidences of gastric illness have reduced substantially.
"Fred. Olsen has been undertaking extensive sanitisation measures and cleaning of the ship, following the company's strict illness containment and prevention plan. It is believed that the highly-contagious gastric illness was brought onto the ship, and is spread by person-to-person or surface-to-surface contact."
For reports on other Balmoral ship accidents see at CruiseMinus.com.