What We Know About Hantavirus Now That People linked To Outbreak Are Back In Canada

Canadian health officials are continuing to closely monitor travellers connected to the international hantavirus outbreak linked to the expedition cruise ship MV Hondius after several passengers and contacts returned to Canada in recent days. Authorities say the overall risk to the public remains low, but health agencies across the country are taking extra precautions because the outbreak involves the rare Andes strain of hantavirus, which can spread between humans in limited situations.

The outbreak first gained global attention earlier this month after multiple passengers aboard the Dutch-flagged cruise ship became seriously ill during a voyage that began in Argentina. According to the World Health Organization, at least eight confirmed or suspected cases have been linked to the outbreak, including three deaths. Several infected passengers required hospitalization in countries including South Africa, France and Spain.

Canadian public health officials confirmed that a number of Canadians were aboard the MV Hondius during the outbreak, while others may have been exposed through international flights connected to infected passengers. Canada’s Public Health Agency said some travellers have already returned home and are now isolating while being monitored for symptoms. Officials recently confirmed that additional people in Ontario were also asked to self-isolate as precautionary “low-risk contacts.”

Health experts say the virus involved in this outbreak is especially important because it is the Andes strain, the only known form of hantavirus capable of spreading from person to person. Most hantavirus infections normally spread through contact with infected rodents, rodent droppings or contaminated dust particles. Human-to-human transmission is considered rare and usually requires close and prolonged contact with an infected person.

Doctors say symptoms can begin with fever, headaches, muscle pain, nausea and fatigue before progressing to severe breathing problems in some patients. In serious cases, hantavirus can lead to hantavirus pulmonary syndrome, a dangerous lung infection that may require hospitalization and breathing support. Medical experts say there is currently no specific cure or approved vaccine for the virus, meaning treatment mainly focuses on supportive care and early medical attention.

One major challenge facing health authorities is the virus’s long incubation period. The World Health Organization and several national health agencies have recommended up to 42 days of monitoring or quarantine for people who may have been exposed during the cruise. Officials say this long observation period is necessary because symptoms can appear weeks after exposure.

International monitoring efforts have expanded rapidly as passengers from the ship travelled to multiple countries before the outbreak was fully recognized. Authorities in the United States, Britain, Canada and several European nations are now tracing contacts and monitoring passengers who may have had close exposure to infected individuals. Some travellers have been placed in specialized medical isolation facilities as a precaution.

Despite growing public attention online, infectious disease experts continue stressing that the outbreak is not considered another COVID-19-style global emergency. Researchers say hantavirus spreads far less easily than respiratory viruses like COVID-19 or influenza. Public health officials also note that the outbreak appears mostly limited to people directly connected to the cruise ship and close-contact exposures.

The Public Health Agency of Canada says it is working closely with provincial governments, international health organizations and border officials to monitor the situation. Officials have continued urging Canadians not to panic but to remain informed about symptoms and follow public health advice if they recently travelled internationally or had possible exposure to confirmed cases.