A hantavirus outbreak tied to a South American cruise ship has now spilled into Canada. Health officials in British Columbia confirmed the country's first case from the deadly cluster, isolating a passenger from the MV Hondius, a Dutch expedition vessel that has drawn significant attention after reports of multiple infections and several deaths among travelers.
It is not just the fact that hantavirus made landfall in Canada that has raised concerns. The Andes strain involved here is the only one that can spread, albeit minimally, from person to person. On top of that, new research suggests the virus might persist in human semen years after recovery.
Combining a live outbreak with troubling new findings on long-term persistence has put hantavirus on everyone's radar, even though most people barely knew it existed.
Canada Confirms First Hantavirus Case in British Columbia: What Happened?
According to The Guardian, Canadian officials explained that the infected patient returned from the cruise earlier this month and developed mild symptoms like fever and headache. Currently, they are in hospital isolation in Victoria, BC, while further testing is completed at Canada's National Microbiology Lab in Winnipeg.
Four Canadians who traveled on the Hondius ended up quarantined after arriving home; one has tested positive. Authorities say the general public is not at high risk, but they are closely monitoring the situation because this strain behaves differently from others.
The cruise outbreak is already linked to deaths in Europe. Investigators suspect passengers were exposed during excursions in South America, where rodents naturally carry the Andes hantavirus.
What Is Hantavirus?
Hantaviruses originate from rodents. People usually become infected by inhaling particles contaminated by rodent urine, droppings, or saliva. Once the virus reaches the lungs, it can progress rapidly, leading to Hantavirus Pulmonary Syndrome (HPS).
Symptoms begin like the flu: fever, muscle aches, exhaustion, nausea, headaches, and then, in severe cases, quickly progress to breathing difficulties and even lung failure. The mortality rate is high, especially with the Andes variant.
Most strains do not spread from person to person. However, the Andes virus, mainly found in Chile and Argentina, is a rare exception. Scientists have documented human transmission, mostly among close contacts like family members or partners.
That contagious twist is why the Hondius outbreak has raised alarm.
The Study That Changed Perception About Hantavirus: What Does It Say?
Recently, a peer-reviewed study heightened concerns by showing that Andes hantavirus genetic material can persist in human semen for nearly six years after infection.
Scientists at Switzerland's Spiez Laboratory, a government institute specializing in biological threats, tracked a 55-year-old man who became infected with hantavirus in South America. According to the study, published in 2023, although the virus disappeared from his blood, urine, and respiratory tract as he recovered, researchers found detectable viral genetic material in his semen 71 months (five years and 11 months) after infection.
Scientists noted that they found genetic material, not necessarily live virus. Still, the discovery raises new questions: Could recovered patients transmit the virus sexually, long after they appear fully healed?
The testes are known as an immune-privileged site, allowing some viruses to hide there, protected from the body's defenses. This phenomenon has been observed with Ebola and Zika viruses.
No confirmed cases of sexual transmission of hantavirus have been reported so far. However, given the Andes strain's unique ability to spread between people, experts are not dismissing the possibility.
How Long Does Hantavirus Persist After Infection?
That is now a pressing question.
Outside the body, hantavirus can survive for days, especially in cool indoor areas contaminated with rodent droppings. The American Lung Association states it can survive up to four days, depending on conditions.
Inside humans, the situation is more complex. For most individuals, the virus clears from blood and lung samples relatively quickly after recovery. However, new research shows that fragments of the Andes virus genome can persist in reproductive tissue for years after the initial infection.
Experts caution that the presence of viral RNA in the body does not necessarily mean a person is contagious. Many diseases leave genetic remnants long after the infectious virus is eliminated.
Nevertheless, further research is urgently needed to determine whether these lingering viral traces could lead to rare or delayed transmission.
Why Experts Are Not Calling This 'Another COVID'
Despite online fears, doctors emphasize that hantavirus is not like COVID-19. It is far less contagious, outbreaks are small, and transmission is typically linked to direct exposure—there is no widespread community spread. According to the World Health Organization, rodent contact remains the primary risk worldwide, but cruise ships and close shared spaces create unusual transmission conditions, especially for the Andes strain.
As of now, Canadian health officials continue isolation and monitoring, collaborating with global agencies to track the outbreak's reach and determine next steps.
