Research conducted in various parts of Argentina continues to provide key information to understand the hantavirus outbreak associated with the MV Hondius cruise ship. Preliminary results indicate that the rodents captured during monitoring operations do not belong to the species considered the main reservoir of the Andes strain, the only known variant capable of being transmitted between people.
The studies were conducted in Mendoza and Tierra del Fuego, two provinces linked to the journey of one of the passengers who may have contracted the disease before boarding. In addition to strengthening epidemiological surveillance, these tasks allow for a better understanding of the relationship between wildlife, Patagonian ecosystems, and emerging diseases.
While laboratory analyses continue, health authorities emphasize that there is no evidence indicating an uncontrolled spread of the virus in the investigated areas.
Rodent Monitoring in Patagonian Ecosystems
As part of the research, specialists installed more than 250 traps in different sectors of the outskirts of Malargüe, in Mendoza. The objective was to identify possible natural reservoirs of hantavirus and determine if there was active circulation of the Andes strain in the region.
However, the specimens captured did not correspond to Oligoryzomys longicaudatus, popularly known as long-tailed mouse, the main carrier of the virus in much of Argentine and Chilean Patagonia.
In parallel, surveys were also conducted in Tierra del Fuego during May, including areas near Ushuaia, the city from which the cruise departed on April 1. There, no individuals of this species were detected either.
Preliminary Results and New Lines of Study
During the fieldwork, researchers identified specimens of Abrothrix olivacea, a small rodent that showed presence of antibodies against the Andes strain in previous investigations.
However, this species is not currently considered a relevant epidemiological vector for the transmission of the virus. Additionally, preliminary evaluations did not detect signs that would confirm active infection in the captured animals.
Meanwhile, the samples obtained continue to be analyzed in specialized laboratories. The studies aim to determine more precisely if there is any link between the local fauna and the investigated outbreak.
The Hantavirus Outbreak on the Tierra del Fuego Cruise
The case drew international attention after infections associated with the MV Hondius cruise were recorded, an expedition vessel that departed from Ushuaia bound for southern regions.
So far, the World Health Organization has recorded 13 confirmed or probable cases linked to the episode, including three fatalities. Investigations suggest that the initial case may have been related to prior exposure on the mainland.
The Andes strain poses a particular health concern because it is the only known hantavirus variant capable of transmission between humans. However, specialists emphasize that these events remain infrequent and require specific conditions to occur.
The Ecological Importance of Health Monitoring
The monitoring of rodent populations is a fundamental tool for understanding the dynamics of zoonotic diseases and protecting both human health and biodiversity.
Additionally, monitoring allows for the detection of environmental changes that may favor the expansion of certain species or alter the distribution of pathogens in ecosystems.
In this context, the surveys conducted in Mendoza, Malargüe, Tierra del Fuego, and Ushuaia provide valuable information to strengthen prevention and move towards an integrated management of environmental health, where the conservation of ecosystems and epidemiological surveillance act complementarily.
