Investigators in Argentina are conducting a rodent trapping operation in the forests near Ushuaia, a city in Tierra del Fuego, to trace the source of a hantavirus outbreak linked to the MV Hondius cruise ship. This outbreak has resulted in three fatalities and several illnesses among passengers. The Malbrán Institute, Argentina’s leading infectious disease research center, is spearheading the investigation, which involves checking 150 box traps for rodents. Blood samples will be collected and tested for the hantavirus, with results expected in up to one month. The hantavirus has never been documented in Ushuaia or the surrounding region, raising questions about its origin. Health authorities are particularly focused on disproving the theory that the virus spread from a local landfill visited by the first victims, a Dutch couple who died after the cruise. The investigation is also significant as it may reveal whether hantavirus exists in Tierra del Fuego, especially given the rising number of cases in Argentina attributed to habitat changes due to climate change. This effort reflects broader concerns about the impact of global warming on disease transmission.