welcome back to "the lead," live from capitol hill. some other national news now. cruise ship passengers should be rock climbing and zip lining, not running to the bathroom because your dinner will not stay down. such is the case for a ship because of an outbreak of norovirus. 577 passengers and 49 crew members reported symptoms, such as vomiting and diarrhea. some of this may sound way too familiar because it's happened before, including nine times last year alone. cnn's medical correspondent, elizabeth cohen, has more. >> reporter: another cruise ship cutting short its planned caribbean island hopping and