More than 120 people aboard a ship operated by Princess Cruises reported symptoms of norovirus, U.S. health officials said on Thursday.

More than 120 passengers and crew members on a Princess Cruises ship that docked in San Francisco on Thursday were infected with a stomach virus while on their voyage, federal health officials said.

The CDC said that 102 out of the over 3,000 passengers onboard the Ruby Princess have been affected, along with 23 crewmembers.