SAN DIEGO — Federal health officials say 106 passengers and six crewmembers aboard the Celebrity Infinity cruise ship were sickened by the gastrointestinal illness norovirus.

The Centers for ******* Control and Prevention says an environmental health officer and an epidemiologist boarded the ship Monday after it arrived in San Diego.

The *** says the highly contagious ***** can be acquired from an infected person, contaminated food or water, or by touching contaminated surfaces.

The *** says staff on the Infinity stepped up cleaning and disinfection in response to the outbreak.

Symptoms of norovirus include vomiting, diarrhea, ***** and body aches. According to the ***, most people recover within three days.

The Infinity was on a 15-night cruise.