Hantavirus Outbreak in Argentina: Two Birdwatchers Contract Virus Near Abandoned Landfill

Berlin, Germany — May 6, 2026 — Two tourists have contracted hantavirus after visiting an abandoned landfill site in northwestern Argentina although birdwatching, according to health authorities. The case marks the third confirmed hantavirus infection in the region this year, raising concerns as Argentina enters its summer season—a period when rodent activity and virus transmission typically increase. Health officials are urging travelers and locals to exercise caution in rural and semi-rural areas where the virus is endemic.

The infected individuals, both international visitors, sought medical attention after experiencing flu-like symptoms, including high fever, muscle aches, and severe headaches, within days of their return home. While one patient has since recovered under medical supervision, the other remains hospitalized in critical condition, according to statements from Argentina’s Ministry of Health. Authorities have not yet disclosed the exact location of the landfill or the specific province where the exposure occurred, citing ongoing investigations.

Why it matters: Hantavirus is a potentially deadly zoonotic disease transmitted through contact with rodent urine, droppings, or saliva. The virus is not contagious between humans, but early diagnosis and supportive care are critical to survival. With Argentina reporting a 20% increase in hantavirus cases over the past five years, experts warn that climate change and deforestation may be expanding the virus’s geographic range.

How the Outbreak Unfolded: A Timeline of Events

Health officials confirmed the infection in the two tourists on April 28, 2026, after laboratory tests at the National Institute of Infectious Diseases “Dr. Carlos Malbrán” in Buenos Aires returned positive results for Andes hantavirus, the strain most commonly found in South America. The patients had visited the landfill site on April 15 during a guided birdwatching tour, unknowingly entering an area with high rodent activity.

In a statement released May 2, Argentina’s Health Ministry warned that the landfill—officially closed but still inhabited by feral rodent populations—poses a significant public health risk. “This is not an isolated incident,” said Dr. María Laura Burgos, director of Epidemiology at the Ministry. “We are seeing an alarming rise in cases linked to abandoned sites, construction zones, and rural properties where rodents have proliferated.” Burgos emphasized that the virus can survive for weeks in dried rodent urine, increasing exposure risks during dry seasons.

While the two tourists are the first confirmed cases linked to the landfill, local health authorities in the province of Salta reported a separate outbreak in early April affecting three farmworkers. Those individuals had been exposed to rodent droppings while clearing out storage sheds. All three recovered with intensive care, but the incidents underscored the necessitate for heightened vigilance.

Hantavirus in Argentina: A Growing Concern

Argentina has recorded an average of 50–70 hantavirus cases annually over the past decade, with seasonal spikes during the summer months (November–March). The virus is primarily carried by the Oligoryzomys longicaudatus (Andean long-tailed mouse) and Calomys musculinus (vesper mouse) species, both of which thrive in rural and peri-urban environments.

Dr. Roberto Debat, an infectious disease specialist at the University of Buenos Aires, noted that climate variability—such as prolonged droughts followed by heavy rains—disrupts rodent habitats, forcing them into closer contact with humans. “We’re observing a shift in transmission patterns,” Debat said in an interview with World Today Journal. “What was once a rural problem is now appearing in suburban areas as rodents migrate toward human settlements.”

Globally, hantavirus infections have been documented in over 30 countries, with the highest fatality rates reported in the Americas. The World Health Organization (WHO) estimates that hantavirus pulmonary syndrome (HPS) has a case-fatality rate of 30–40%, though early medical intervention can reduce this significantly.

What Travelers Need to Know: Safety Tips for Visiting Argentina

For tourists and expatriates planning trips to Argentina, especially during the summer season, health experts recommend the following precautions:

• Avoid rodent-infested areas: Stay on marked trails during hikes, and avoid entering abandoned buildings, landfills, or construction sites.
• Protect food and water: Store food in sealed, rodent-proof containers. Do not eat or drink outdoors where contamination is possible.
• Use repellent: Apply insect repellent containing DEET or picaridin to exposed skin, even in urban areas where rodents may nest.
• Clean thoroughly: If staying in rural accommodations, disinfect surfaces with a bleach solution (1 part bleach to 10 parts water).
• Seek medical attention immediately: If symptoms such as fever, cough, or difficulty breathing develop within weeks of returning from a high-risk area, consult a healthcare provider and mention potential hantavirus exposure.

Argentina’s Ministry of Health has not issued a travel advisory, but it advises visitors to monitor updates from local health authorities. The CDC’s travel health notice for Argentina currently lists hantavirus as a “Level 1: Practice usual precautions,” though it notes that risks vary by region.

Expert Perspectives: Addressing the Rising Threat

Dr. Bassetti, an infectious disease specialist based in Italy, has warned of the potential for hantavirus to spread beyond endemic regions if not properly contained. In a recent interview with Italian media, he highlighted the role of global travel in disseminating zoonotic diseases. “While hantavirus is not airborne, the movement of infected individuals—even those asymptomatic—can introduce the virus to recent areas,” Bassetti said. “This is why international coordination on surveillance and public health messaging is critical.”

In Argentina, efforts to combat hantavirus include public awareness campaigns, rodent control programs, and the distribution of protective gear to farmworkers and outdoor enthusiasts. Yet, experts argue that more resources are needed to address the root causes, such as poverty-driven deforestation and inadequate waste management in rural communities.

What’s Next: Monitoring and Response

Argentina’s Health Ministry has convened an emergency task force to investigate the landfill-related cases and assess the broader risk to public health. The next critical checkpoint is the release of the task force’s report, expected by May 20, 2026, which will outline recommendations for landfill management, rodent control strategies, and public health communications. Meanwhile, the Pan American Health Organization (PAHO) is collaborating with Argentine authorities to strengthen laboratory capacity for rapid hantavirus detection.

For readers traveling to Argentina or other hantavirus-endemic regions, the CDC and WHO recommend consulting their official hantavirus resources for region-specific guidance. The Argentine Consular Network provides health and safety updates for travelers.

Reader Questions: Hantavirus FAQ

Stay Informed: Official Resources

For the latest updates on hantavirus in Argentina and global health advisories, visit:

• Argentina Ministry of Health
• Pan American Health Organization (PAHO)
• CDC Travel Health Notice for Argentina
• WHO Hantavirus Fact Sheet

Have you or someone you know been exposed to hantavirus? Share your experience in the comments below or contact your local health department for guidance.

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