here is the link that will take you to the list of ships which have been affected. however, not all outbreaks may be on this list as the medical facilities are only required to report an outbreak when it affects a certain % of people on board (I think it is about 8%). The key to not getting sick is washing your hands frequently, carry a small bottle of hand sanitizer. I heard that eating yogurt (has active cultures in it) can help prevent Norovirus... but not sure if it is myth or fact. Still... I always have one for breakfast on my cruises and have been fortunate not to get sick.