Dutch ornithologist Leo Schilperoord has been identified as the first known case in the deadly hantavirus outbreak linked to the MV Hondius cruise ship , after falling ill during an April voyage in the South Atlantic . His case is central to efforts by global health officials to trace how the rare virus spread among passengers and across borders. Schilperoord, 70, and his wife Mirjam, 69, were experienced birdwatchers who had spent months traveling across South America before boarding the MV