Maggie Rulli, Dragana Jovanovic After the doctor on the cruise ship MV Hondius contracted the hantavirus, an American doctor onboard jumped into action to help passengers navigate the outbreak. Dr. Stephen Kornfeld, an oncologist from Bend, Oregon, told ABC News that he quickly realized he was leading the response to a full-blown medical crisis on board the cruise ship. The ship's unidentified doctor was among the six people onboard who tested positive for the virus.