A doctor traveling as a passenger on the MV Hondius cruise ship has revealed how he stepped in to treat hantavirus patients after the ship’s medic was one of those sickened by the outbreak that has killed at least three people. “I sort of fell into the role of becoming the ship doctor,” Stephen Kornfeld told CNN Thursday of his unexpected work role after the cruise ship’s primary doctor was sickened. “I knew one of the passengers was getting ill. This is at the end of April, and I just reached