BUENOS AIRES, Argentina (AP) — Officials and experts in Argentina are scrambling to determine if their country is the source of a deadly hantavirus outbreak that has gripped an Atlantic cruise.

The health emergency aboard the ship that’s moored across the ocean comes as Argentina sees a surge of hantavirus cases that many local public health researchers attribute to the recently accelerating effects of climate change. Argentina, where the cruise to Antarctica departed, is consistently ranked by the World Health Organization as having the highest incidence of the rare, rodent-borne disease in Latin America.

Higher temperatures expand the virus’ range because, in part, as it gets warmer and ecosystems change, rodents that carry the hantavirus can thrive in more places, experts say. People typically contract the virus from exposure to rodent droppings, urine or saliva.

“Argentina has become more tropical because of climate change, and that has brought disruptions, like dengue and yellow fever, but also new tropical plants that produce seeds for mice to proliferate,” said Hugo Pizzi, a prominent Argentine infectious disease specialist. “There is no doubt that as time goes by, the hantavirus is spreading more and more.”

The Argentine Health Ministry on Tuesday reported 101 hantavirus infections since June 2025, roughly double the caseload recorded over the same period the previous year.