Hantavirus Detected on Cruise Near World's Southernmost City
Argentine health investigators are combing the forests around Ushuaia — the southernmost city on earth and a popular port of call for cruise ships — trapping rodents in an effort to trace the source of a deadly hantavirus outbreak that has alarmed public health officials across the hemisphere.
The outbreak is linked to a cruise that set sail last month. Authorities are now focusing on the Ushuaia region, an area that had previously been considered unaffected by the virus, raising concerns that hantavirus may be spreading into new territories.
What Is Hantavirus?
Hantavirus is a potentially fatal illness transmitted primarily through contact with infected rodents — their droppings, urine, saliva, or nesting materials. In severe cases, it can cause Hantavirus Pulmonary Syndrome (HPS), a rapid-onset respiratory illness with a mortality rate that can exceed 30 per cent.
Unlike the flu or COVID-19, hantavirus does not spread easily from person to person. The danger lies in environments where infected wild rodents are present — forests, barns, cabins, or anywhere rodents nest and leave behind biological material. Cruise ships that dock near forested shorelines, as many Patagonian itineraries do, can create unexpected points of exposure for passengers who venture ashore.
Why It Matters for Canadian Travellers
Patagonia — encompassing southern Argentina and Chile — is one of the most sought-after adventure travel destinations for Canadians. Ushuaia, often called "the end of the world," serves as the gateway for Antarctic cruises and trekking expeditions through Tierra del Fuego. Tens of thousands of Canadians board South American cruises each year, with Patagonian routes among the most popular.
The discovery of hantavirus activity in a region previously thought free of the virus is significant. Argentine investigators are working quickly to determine whether local rodent populations are carrying the strain, which could affect how travel advisories are issued going forward.
Canadians planning trips to Patagonia or Antarctic cruises departing from Ushuaia are advised to check the Government of Canada's travel health notices at travel.gc.ca before departure and to consult a travel medicine clinic.
What Investigators Are Doing
As of this week, Argentine authorities were actively trapping rodents in forested areas surrounding Ushuaia. The goal is to test captured animals for hantavirus and determine whether the outbreak originated in the local environment — or whether it was introduced from elsewhere along the cruise route.
The work is painstaking. Hantavirus strains vary by region, and identifying which rodent species carries the responsible strain can take days of field and laboratory work. Results could reshape understanding of the virus's geographic range in the southernmost cone of South America.
A Reminder About Biosecurity on Expedition Travel
For travellers, the outbreak is a reminder that expedition-style tourism — hiking remote trails, sleeping in forest lodges, or even exploring port towns — carries real public health considerations. Avoiding contact with wild rodents, not disturbing nesting sites, and washing hands thoroughly after outdoor excursions are the most effective precautions.
Health authorities have not issued a blanket warning against travel to the region, but the investigation is ongoing and the situation bears watching.
Source: CBC Health — original reporting via CBC News.
