Scientists Analyze Andes Hantavirus Transmission and Environmental Factors in Patagonia

Experts in Argentina are investigating the Andes hantavirus strain following an outbreak linked to the cruise ship MV Hondius in Patagonia. While the virus is primarily spread by the long-tailed pygmy rice rat through contact with excreta, this strain uniquely allows for rare person-to-person transmission. Scientists emphasize that this human transmission is not due to recent mutations, as the virus remains genetically stable, but rather requires close, prolonged contact. Environmental factors, such as heavy rainfall from El Niño, increase rodent populations and subsequent human exposure risks, though these factors do not directly influence human-to-human spread. Research is hindered by the low number of annual cases and the rapid, severe progression of the disease, which complicates clinical studies and contact tracing. Currently, Argentina has recorded 102 hantavirus cases this season, nearly double the previous year. Specialists are also debating whether local rodent subspecies in Ushuaia act as reservoirs, prompting further investigation by national health institutes. The article highlights the ongoing scientific effort to understand why this specific strain occasionally generates transmission chains among humans despite its overall low transmissibility compared to viruses like influenza.