Deadly Hantavirus Surges in Argentina, Spreads to Cruise Ship

Argentina is experiencing a severe hantavirus outbreak, with 101 cases reported since June 2025, a figure that has roughly doubled compared to the same period last year. This surge is being increasingly linked by public health researchers to the accelerating effects of climate change, which experts say is altering ecosystems and expanding the range of rodents that carry the virus.

The Andes virus strain, found in South America, can cause a fatal lung disease. In the past year, nearly a third of reported cases in Argentina resulted in death, a significant increase from the previous five-year average of 15%. While typically spread by inhaling contaminated rodent droppings, the Andes virus is known to transmit between humans, though this is rare.

A recent outbreak aboard the MV Hondius cruise ship, which departed from Argentina, has resulted in three passenger deaths: a 70-year-old Dutch man on April 11, his 69-year-old wife on April 26, and a German woman on May 2. Authorities are attempting to trace the passengers' travel history within Argentina and Chile to pinpoint the source of infection, which could have occurred before boarding, during a stop, or on the ship itself.

Experts note that changing weather patterns, including intense rainfall and droughts, create conditions conducive to rodent population growth, thereby increasing the risk of hantavirus transmission to humans. The disease's early flu-like symptoms can be misleading, potentially delaying diagnosis and treatment.