The dreaded norovirus has struck the Queen Elizabeth 2 cruise ship. The ship docked on Wednesday (January 24) in San Francisco, California with dozens of sick passengers on board. So far, some 276 passengers and 28 crew members had shown signs of norovirus. That is about 16 percent of all the people on the ship. Norovirus is a common ailment that causes vomiting and diarrhoea for 48 to 72 hours. A team from the United States Center for Disease Control boarded the ship late last week in Acapulco, Mexico to investigate the outbreak.