The ship's previous cruise had cases of the illness but was unloaded and relaoded and away again before anyone actually stepped in and did anything, so now the ship is out at sea with quite a few sick passengers and crew and by the looks of it, ports don't want her anywhere near them - for understandable reasons...
http://www.timesonline.co.uk/tol/travel/news/article6373015.ece
http://www.pocruises.com.au/html/p-o-cruises-changes-pacific-dawn-itinerary.cfm
http://www.timesonline.co.uk/tol/travel/news/article6373015.ece
http://www.pocruises.com.au/html/p-o-cruises-changes-pacific-dawn-itinerary.cfm