In Buenos Aires, Argentina, officials and health experts are working diligently to investigate a possible outbreak of hantavirus linked to an Atlantic cruise ship. The MV Hondius, which departed from Ushuaia, Argentina, to Antarctica, has reported several cases of the deadly Andes virus, raising significant concerns as Argentina experiences a surge in hantavirus infections attributed largely to climate change. The World Health Organization (WHO) consistently ranks Argentina as having the highest incidence of this rare, rodent-borne disease in Latin America.
Amid rising temperatures, researchers believe that climate change has expanded the range of hantavirus. As ecosystems shift, rodents that carry the virus can inhabit new areas, increasing the risk of human exposure through contaminated droppings, urine, or saliva. Hugo Pizzi, an Argentine infectious disease specialist, noted that changing climate conditions have resulted in an environment conducive to the proliferation of hantavirus, with relevant outbreaks occurring against the backdrop of increased temperatures, altered rainfall patterns, and new tropical plants that support rodent populations.
According to the Argentine Health Ministry, there have been 101 reported cases of hantavirus since June 2025, nearly double the cases compared to the previous year. The Andes virus can lead to hantavirus pulmonary syndrome, a severe lung disease that has shown a high mortality rate in recent instances, reaching nearly 30% in the last year, as opposed to the previous average of 15% over five years.
Passengers aboard the MV Hondius have tested positive for the Andes virus, prompting Argentine authorities to dispatch genetic material and testing equipment to various countries, including Spain, Senegal, South Africa, the Netherlands, and the United Kingdom, to assist in tracking the virus's spread. Investigations are currently focused on retracing the travel itineraries of infected passengers in Argentina to identify possible points of infection. The government suspects that the outbreak may have originated from a bird-watching trip taken by a Dutch couple in Ushuaia.
The incubation period for hantavirus ranges from one to eight weeks, complicating efforts to pinpoint where passengers contracted the virus before boarding the cruise liner. The province of Tierra del Fuego, where the ship was docked, has not recorded any previous hantavirus cases, intensifying scrutiny on the couple's pre-cruise activities, which included trips to various locations in Argentina and Chile. Authorities are also examining hiking areas of Patagonia, where some infections have been reported.
Argentina has faced climate challenges in recent years, including historic droughts and unexpected heavy rainfall, creating conditions that facilitate the spread of hantavirus. Increased rainfall can lead to vegetation growth, which in turn attracts rodents and can spread the virus further among the animal population. As a result, hantavirus cases, once concentrated in southern Patagonia, have now shifted to the northern regions of Argentina, where 83% of cases are now reported.
In January, the Health Ministry issued alerts regarding several fatal outbreaks, including in Buenos Aires province. An alarming incident involved a 14-year-old boy, Rodrigo Morinigo, who was initially misdiagnosed with the flu before rapidly deteriorating and dying after testing positive for hantavirus. This emphasizes the danger of misidentifying early symptoms of the virus, which can resemble those of common viral infections.
As health officials continue to investigate and manage the outbreak, the urgent need for public awareness and timely medical intervention remains crucial. The interconnectedness of climate change, human activity, and animal diseases is becoming increasingly evident, necessitating a comprehensive approach to address the outbreak and prevent future occurrences.
