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.

Norovirus is highly contagious, often spread by food or on surfaces. It can be dangerous for people with underlying health conditions

Over 125 passengers and crew on the Ruby Princess cruise were infected with norovirus during a 20-day voyage from San Francisco.

Over 125 passengers and crew on the Ruby Princess cruise were infected with norovirus during a 20-day voyage from San Francisco.

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.

Health officials say more than 120 passengers and crew on a Princess Cruises ship were infected with a stomach virus during a 20-day trip to Canada and Alaska.