Argentina is experiencing the most severe hantavirus season in recent years. Official records show a sustained increase in cases and a higher lethality rate than in previous periods, in a context marked by forest fires, extreme climate changes, and a growing human pressure on wild environments.
Moreover, specialists warn that the urban expansion into rural and natural areas has increased contact between people and virus-carrying rodents. Simultaneously, environmental changes have altered wildlife movements and favored new contagion hotspots.
The Ministry of Health confirmed that the 2025-2026 season has already surpassed the threshold considered an outbreak. So far, 101 confirmed cases have been recorded, almost double those registered during the same period of the previous cycle.
At the same time, the mortality rate reached 32%, a figure that concerns health authorities due to the speed at which the disease progresses and the difficulty in detecting it in early stages.
Affected regions and new areas under surveillance
Although historically hantavirus has been associated with Patagonia, especially due to the circulation of the Andes virus, the epidemiological map has changed in recent years. Currently, the highest number of infections is concentrated in the Central and Northwestern regions of the country.
The province of Buenos Aires leads the records with 42 confirmed cases. However, the highest incidence was detected in Salta and other areas of Northwestern Argentina, where climatic conditions favored the growth of wild rodent populations.
Infections have also been reported in Río Negro and Chubut. In the latter territory, an intrafamilial cluster was detected in Cerro Centinela, while in Río Colorado, a case appeared outside the historically considered endemic areas.
On the other hand, experts link this phenomenon to recent forest fires, prolonged droughts, and intense rains that alter the availability of food and water for the natural reservoirs of the virus.
What is hantavirus and how is it transmitted?
The hantavirus is a zoonotic disease caused by viruses primarily carried by certain wild rodents. People can become infected by inhaling particles present in the urine, saliva, or dried excrement of infected animals.
Additionally, contact with contaminated surfaces or the handling of materials in enclosed environments also pose risk factors. In some variants, such as the Andes virus present in southern Argentina, person-to-person transmission may occur.
Initial symptoms are often confused with other common illnesses. Fever, muscle aches, fatigue, and gastrointestinal disorders appear in the early stages, while a severe respiratory condition may develop later.
Since there is no vaccine or specific treatment, early detection is crucial. For this reason, authorities recommend ventilating closed spaces before entering, avoiding contact with rodents, and keeping rural or camping areas clean.
The environmental crisis behind the increase in cases
Climate change is increasingly linked to the behavior of hantavirus. Intense rains favor the growth of vegetation and seeds, increasing the food available for rodents.
However, droughts and fires also cause animal movements towards urbanized or inhabited areas. As a result, the possibilities of contact with humans multiply.
In regions like Patagonia, the Northwest, and the province of Buenos Aires, environmental modifications have already altered entire ecosystems. In this scenario, scientists and epidemiologists agree that health prevention must advance alongside environmental conservation policies and responsible land management.
