(CNN)Gastrointestinal illness has gripped 100 people on the cruise ship Celebrity Infinity, according to a report from the Centers for Disease Control. Of the ship's 2,117 passengers, 95 have suffered from vomiting, diarrhea and other symptoms, the CDC said. The illness has also affected five members of the 964-person crew. The CDC has yet to determine what's causing the ailments. Two staffers from the agency are scheduled to meet the West Coast-based ship in San Diego on Monday. The Infinity left San Diego on March 29. It made its last stop in Puerto Vallarta, Mexico, on April 10, according to MarineTraffic.com. Celebrity Cruises has been taking action since the outbreak began, including increasing cleaning and disinfection procedures, keeping passengers informed and taking specimens from the afflicted for testing by the CDC, the agency says. According to the Maritime Executive, this is the third time the Celebrity Infinity has suffered an outbreak of gastrointestinal illness, with others occurring in 2006 and 2013. The ship was built in 2001 and refurbished in 2011.
100 passengers and crew members have been sickened on Celebrity Infinity . The ship, which is based on the West Coast, left San Diego in late March . The CDC is scheduled to board the ship Monday .