As Canadians begin opening cottages, cabins, garages, and sheds after the winter season, public health experts are reminding the public about an important—but often overlooked—health risk: hantaviruses.
Recent international attention surrounding an outbreak of Andes virus linked to the MV Hondius cruise ship has brought hantaviruses into the spotlight. While the Andes virus is not present in North America, Canadian experts say the situation serves as an important reminder that Canadians can still be exposed to another dangerous hantavirus carried by deer mice here at home.
At Destinations Travel Clinic (DTC), our physician- and nurse-led travel health team believes prevention and education are critical components of protecting Canadians from infectious diseases—both abroad and within Canada itself.
What Is Hantavirus?
Hantaviruses are a group of viruses carried primarily by rodents, including mice and rats. There is currently no vaccine for Hantavirus. Humans can become infected through exposure to:
- Rodent droppings
- Urine
- Saliva
- Contaminated dust particles that become airborne
In Canada, the primary concern is the Sin Nombre virus, which is carried by deer mice and can cause Hantavirus Pulmonary Syndrome (HPS).
Although rare, HPS is a serious illness with a mortality rate estimated at approximately 30%.
Is the Cruise Ship Outbreak a Risk to Canadians?
The recent outbreak associated with the MV Hondius cruise ship involved the Andes virus, which is found only in South America. Unlike the Sin Nombre virus in North America, Andes virus is capable of limited human-to-human transmission.
According to infectious disease experts at the Public Health Agency of Canada’s National Microbiology Laboratory, the risk of widespread transmission in Canada remains low because Andes virus transmission generally requires prolonged close contact with an infected individual.
Why Spring Is Peak Hantavirus Season in Canada
Spring is when many Canadians begin:
- Opening seasonal cottages
- Cleaning sheds and garages
- Accessing cabins and rural buildings
- Clearing storage areas
- Opening campers or trailers
These enclosed spaces may have accumulated rodent activity during the winter months.
Even if rodents are not immediately visible, deer mice may still have left contaminated droppings, urine, or nesting materials behind.
The greatest risk occurs when contaminated particles become aerosolized and inhaled during sweeping, vacuuming, or cleaning.
Where Are Most Canadian Cases Found?
Most reported Canadian cases of hantavirus pulmonary syndrome have occurred in:
- Alberta
- Saskatchewan
- Manitoba
- British Columbia
Because deer mice are common across Western Canada, rural and recreational property owners should remain especially cautious during spring cleaning activities.
Symptoms of Hantavirus Pulmonary Syndrome (HPS)
Early symptoms can resemble many common viral illnesses and may include:
- Fever
- Fatigue
- Muscle aches
- Headache
- Nausea
- Vomiting
- Diarrhea
As the illness progresses, patients may develop:
- Cough
- Shortness of breath
- Severe respiratory distress
- Low oxygen levels
HPS can rapidly become life-threatening and often requires hospitalization and supportive respiratory care.
How to Safely Open Cottages, Cabins, and Sheds
The most important protection against hantavirus is avoiding inhalation of contaminated dust.
Recommended Safety Precautions
1. Air Out Buildings First
Before cleaning:
- Open windows and doors
- Let buildings ventilate for at least 30 minutes if possible
- Avoid entering enclosed dusty spaces immediately
Good ventilation helps reduce airborne particles.
2. Do NOT Sweep or Vacuum Dry Rodent Droppings
Sweeping or vacuuming can aerosolize virus-containing particles.
Instead:
- Spray droppings with disinfectant first
- Use a bleach or mild detergent solution
- Allow the solution to soak for several minutes
This helps inactivate the virus before cleanup.
3. Wear Proper Protective Equipment
Experts recommend wearing:
- Disposable gloves
- An N95 respirator or equivalent mask
- Protective clothing if contamination is significant
N95 masks are especially important when cleaning enclosed areas with potential rodent exposure.
4. Dispose of Waste Safely
After cleanup:
- Place contaminated materials in sealed bags
- Wash hands thoroughly
- Disinfect reusable tools and surfaces
Is There Treatment for Hantavirus?
There is currently:
- No specific antiviral medication for HPS
- No approved vaccine for general public use in Canada
Treatment is primarily supportive and may include:
- Oxygen therapy
- Intravenous fluids
- Intensive care monitoring
- Mechanical ventilation in severe cases
Early recognition and prompt medical attention can improve outcomes.
When Should You Seek Medical Attention?
Seek urgent medical care if you develop:
- Fever after rodent exposure
- Severe fatigue
- Worsening cough
- Difficulty breathing
This is particularly important if symptoms occur within several weeks of cleaning rodent-contaminated areas.
Travel Health and Environmental Infection Risks
At Destinations Travel Clinic, our travel medicine physicians and nurses help patients understand infectious disease risks associated with:
- International travel
- Wilderness and outdoor exposure
- Cruise travel
- Rural accommodations
- Environmental and zoonotic infections
Travel medicine is not limited to vaccines alone. Understanding environmental health risks—including diseases carried by rodents, insects, animals, and contaminated environments—is an important part of comprehensive preventive care.
Whether preparing for international travel, seasonal cottage visits, or wilderness adventures, professional travel health guidance can help reduce preventable health risks.
Frequently Asked Questions About Hantavirus
Most hantaviruses cannot spread between humans. The Andes virus in South America is the main exception.
No. Canada typically sees only a small number of cases annually, but infections can be very serious.
Yes. Deer mice are widespread across Western Canada and rural areas.
Potentially yes, especially if rodent droppings become airborne during cleaning.
An N95 respirator is preferred when cleaning areas that may contain rodent contamination.
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