The skyline of downtown San Francisco with the Golden Gate Bridge. Gary Coronado//TNSNearly 160 people suffered from vomiting and diarrhea aboard a luxury cruise ship that has since departed from San Francisco, health officials confirmed, and it’s still unclear what caused the mysterious gastrointestinal outbreak. The Queen Victoria departed from San Francisco on Wednesday, Feb. 7, and is now headed toward Hawaii, Jackie Chase, a Cunard press representative, told SFGATE. Since the outbreak, cruise employees have isolated sick passengers and crew and increased its sanitization protocols, the CDC’s website said. Advertisement Article continues below this adAccording to the CDC, cruise ships create the perfect storm for gastrointestinal illness.