Argentine health officials launched an intensive field investigation Tuesday to determine whether a deadly hantavirus outbreak that killed three cruise passengers originated in Ushuaia, a popular tourism gateway previously considered free of the rat-borne disease. The probe carries significant implications for the region's vital tourism industry and raises questions about the government's initial response to the outbreak.
Scientists from the state-backed Malbrán Institute, Argentina's leading research center for infectious diseases, set 150 box traps in forests surrounding Ushuaia, collecting rodent specimens for testing in what marks the first systematic examination of hantavirus presence in the southernmost city. Wearing bright blue gloves and surgical masks, researchers dropped dead rats into black plastic bags and transported them to a makeshift laboratory for blood sampling.
Investigation Timeline and Costs
The fieldwork began almost two weeks after the Argentine Health Ministry first announced it would send the Malbrán Institute team to Ushuaia. The team planned to repeat the trapping routine for three days before returning samples to the institute's main Buenos Aires laboratory, where testing could take up to one month. Officials declined to provide details on the investigation's cost or scope beyond the initial trapping operations.
Martín Alfaro, spokesperson for the local health ministry of Tierra del Fuego, confirmed that investigators "were able to capture what was expected," though authorities remained tight-lipped about further details.
Tourism Hub at Risk
The investigation centers on Ushuaia, famed for its location at the "end of the world" and serving as the main gateway to the Antarctic. The city's tourism-dependent economy faces potential disruption as investigators work to determine whether the hantavirus has established a presence in an area previously thought unaffected.
The outbreak struck the MV Hondius cruise ship, killing three people and sickening several others, setting off a global scramble to trace passengers and their close contacts. The first known victims were a Dutch couple passionate about birds who concluded a sprawling road trip across Chile and Argentina in late March with bird-watching and trekking in Ushuaia before boarding the ship April 1. Both have since died, complicating efforts to retrace their path through the country.
Government's Shifting Hypothesis
Health authorities rejected the national government's initial hypothesis that the chain of infections began when the Dutch couple visited an Ushuaia landfill. Provincial officials further north in Patagonia, where hantavirus is endemic, insist the couple didn't visit during the window in which they are believed to have contracted the infection.
The hantavirus has never been recorded in Ushuaia or the wider archipelago of Tierra del Fuego. Found throughout southern Chile and Argentina, the Andes virus may spread between people in rare cases. Most clusters emerge from exposure to air contaminated with feces and urine of the long-tailed pygmy rice rat known as the colilargo that runs rampant through forests of northern Patagonia.
Climate and Geographic Factors
The colilargo itself has no presence across the Strait of Magellan in Tierra del Fuego, believed to be too cold and isolated for the rat. However, a subspecies can be found in forests around Ushuaia, and scientists have never examined whether it can transmit hantavirus.
Health authorities in Tierra del Fuego said scientists were trapping rats in two areas where the colilargo subspecies proliferates: the national park and wooded hillsides overlooking Ushuaia's main pebble beach. Alfaro said, "The province has never done this kind of testing before," adding, "It's important that we rule out the possibility of transmission occurring here."
The number of hantavirus cases has increased in recent years in Argentina, a trend scientists attribute to colilargos vastly increasing their range as a result of climate change and human encroachment.
Why This Matters:
The investigation's outcome will determine whether one of Argentina's premier tourism destinations requires new public health protocols and visitor warnings, potentially affecting the region's economic viability. The government's initial misidentification of the outbreak's source raises questions about the adequacy of existing disease surveillance systems in remote areas. If hantavirus is confirmed in Ushuaia, cruise operators and tour companies serving the Antarctic gateway face increased liability and operational costs. The expanding range of disease-carrying rodents demonstrates the tangible economic consequences of environmental changes, requiring private sector adaptation and potentially costly government intervention in areas previously considered disease-free. The month-long testing timeline highlights the challenges facing local businesses that depend on immediate clarity about health risks affecting their operations.