Argentine authorities have expanded their investigation into the recent Andes hantavirus outbreak on the MV Hondius cruise ship. Consequently, scientific teams are expanding their search to Mendoza province. They are trapping and testing wild rodents to locate the original source of the infection. US Centers for Disease Control and Prevention (CDC) specialists are actively supporting this mission.

Investigating the Andes Hantavirus Outbreak

Initially, epidemiologists focused their investigation on the southern city of Ushuaia, where the cruise ship departed. However, local authorities in Ushuaia strongly disputed that the virus originated there. They noted that researchers have never detected the Andes hantavirus in the wider Tierra del Fuego archipelago. Therefore, investigators are now expanding their geographic scope to other regions the index patients visited.

The primary suspects in the transmission chain are a Dutch couple who tragically died in April. Specifically, they spent several weeks driving through Argentina, including the Mendoza winemaking region, before boarding the cruise. Consequently, the research teams are focusing their rodent trapping efforts in the city of Malargue, Mendoza. Biologists from the Malbran government research institute and the CDC are conducting these tests. Specifically, they aim to collect blood samples from local rodents to check for the virus.

Clinical Features and Transmission Dynamics

While most hantaviruses spread solely via rodent contact, the Andes hantavirus is unique. Specifically, it is the only strain that transmits directly from person to person. Although this mode of transmission remains marginal, it represents a significant public health concern. The virus causes hantavirus pulmonary syndrome, which has a mortality rate of up to 30 percent. Currently, no approved vaccines or targeted antiviral treatments exist.

Furthermore, reconstructing the chain of transmission is highly complex. The incubation period for hantavirus pulmonary syndrome is typically three weeks, but it can extend up to eight weeks. Because of this long window, tracing patient exposure sites remains extremely difficult. Nonetheless, experts believe that understanding this outbreak will yield critical insights into how the virus behaves in closed environments.

Frequently Asked Questions

Q1: What makes the Andes hantavirus strain unique compared to other hantaviruses?

Unlike other hantaviruses, the Andes strain can transmit directly between humans through close, sustained contact, in addition to the typical route of inhaling aerosolized rodent excreta.

Q2: Where is the current investigation in Argentina focused?

The investigation has expanded to Malargue in Mendoza province, where the infected Dutch couple traveled prior to boarding the MV Hondius cruise ship.

Q3: Is there a pandemic risk associated with this hantavirus?

No, the World Health Organization has indicated that the risk of a widespread pandemic is extremely low due to the limited nature of human-to-human transmission.

Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice or replace professional judgment. Refer to the latest local and national guidelines for clinical practice.

References

1. Argentina expands hantavirus probe, sends teams to test rats in Mendoza - ETHealthworld


2. World Health Organization. Hantavirus outbreak linked to cruise ship travel, Multi-locations. May 2026.


3. Centers for Disease Control and Prevention. Andes Virus Outbreak on a Cruise Ship: Current Situation. June 2026.