In dense urban neighbourhoods like Montreal’s Parc-Extension, rodents are nothing new. Older buildings, busy alleyways, food waste and tightly packed housing can all contribute to mouse and rat activity. But public health experts warn that rodent infestations are more than just a nuisance. In rare cases, they can expose residents to hantavirus, a potentially deadly disease spread through rodent droppings and urine.
The virus has recently drawn international attention after suspected cases aboard a cruise ship led to multiple deaths and monitoring efforts in several countries.
Although hantavirus infections are uncommon in Canada, experts say urban residents should still understand the risks, especially in areas where rodents frequently enter homes, basements and storage areas.
Hantavirus spreads mainly when people breathe in microscopic particles contaminated by rodent urine, saliva or feces. According to Canadian public health authorities, deer mice are the primary carriers in Canada, though exposure to rodent-contaminated environments in general remains a concern.
What makes the virus particularly dangerous is that infection can happen during ordinary cleaning activities. Sweeping mouse droppings or vacuuming contaminated dust can release virus particles into the air.
Health experts strongly advise residents never to dry sweep rodent droppings. Instead, the area should first be soaked with disinfectant or diluted bleach before being wiped clean while wearing gloves.
Symptoms often begin like a common flu. Fever, fatigue, headaches and muscle aches are among the first warning signs. Some patients later develop coughing and severe breathing problems that may require hospitalization.
Doctors emphasize that anyone who develops flu-like symptoms after exposure to rodents or droppings should seek medical attention immediately and mention the exposure history.
Parc-Extension residents living in older apartment buildings are encouraged to report infestations quickly. Signs of rodent activity include droppings in cupboards, gnawed food packaging, nests made from paper or insulation and strong odours similar to ammonia.
Public health agencies recommend practical prevention measures: sealing holes around pipes and walls, keeping food sealed, reducing clutter and ensuring garbage is tightly contained.
Experts stress that hantavirus remains rare, and there is no reason for panic. However, proper cleaning and rodent control are essential because a simple mistake during cleanup can expose someone to a very serious illness.
