This week’s science news was dominated by coverage of a cluster of hantavirus infections aboard the Dutch-flagged cruise ship MV Hondius. The cases first received public attention at the end of last week, but the identification of the hantavirus type as the Andes virus — the only hantavirus type known to pass between people — has led to a flurry of reporting as global health organizations race to trace the contacts of those who disembarked. Cruise passengers in at least five U.S. state...