West Nile virus has been detected in a mosquito sample collected in the Town of Arnprior, marking the first confirmed case of the virus in the Renfrew County and District region for the year 2026, according to the Renfrew County and District Health Unit (RCDHU).
Monitoring and Surveillance Across Renfrew County and District
The RCDHU tracks West Nile virus activity annually through a network of 13 mosquito trapping locations spread across the county and district. Throughout the summer months, mosquitoes from these traps are collected on a weekly basis to test for the presence of the virus.
Did you know? RCDHU operates 13 distinct trapping sites across the region all summer long to catch and test mosquitoes weekly, helping officials track disease spread before human cases emerge.
Despite this recent positive sample, Dr. Jason Morgenstern, Medical Officer of Health for RCDHU, noted via a media release that the immediate risk of infection remains low. However, no local human cases of West Nile virus disease have been reported to the health unit so far in 2026.
Understanding Health Risks and Symptoms
West Nile virus spreads to humans primarily through the bite of an infected mosquito. While four out of five infected individuals will never show symptoms, others may experience fever, headache, body aches, skin rash, and vomiting, according to RCDHU data.
More severe complications are relatively rare. Approximately 1 in 150 people develop illnesses affecting the central nervous system, such as encephalitis or meningitis. Symptoms of these severe cases include a stiff neck, confusion, tremors, numbness, or sudden sensitivity to light. Older adults and people with weakened immune systems face a higher risk of developing severe illness and should seek medical attention promptly if warning signs appear.
Practical Steps to Prevent Mosquito Bites
Public health officials recommend specific measures to reduce personal exposure, particularly between dusk and dawn when mosquitoes are most active. Residents should cover up by wearing light-coloured clothing, including long-sleeved shirts, jackets, long pants, hats, and socks.
Additionally, applying Health Canada-approved insect repellent containing DEET or Icaridin on exposed skin provides essential protection. Users must follow product label instructions carefully for proper application.
Pro Tip: When applying insect repellent, follow label instructions for proper application.
Reducing Breeding Grounds Around Properties
Eliminating stagnant water is critical because mosquitoes require it to lay eggs. Homeowners, cottagers, and campers should regularly clear out standing water from bird baths, old tires, and unused containers.
Property maintenance also plays a role in control efforts. Keeping bushes and shrubs clear of overgrowth and debris prevents adult mosquitoes from finding resting spots in dense foliage. Turning over compost piles regularly and ensuring that windows and door screens fit tightly to keep homes and businesses bug-tight further minimizes local risks.
Frequently Asked Questions
What are the primary symptoms of West Nile virus?
Most infected individuals show no symptoms. Those who do fall ill may experience fever, headache, body aches, skin rash, and vomiting. Severe neurological symptoms like a stiff neck, confusion, or tremors require prompt medical evaluation.
Who is most at risk of severe illness?
According to RCDHU, older adults and individuals with weakened immune systems face a higher risk of developing severe central nervous system complications.
Where can I find more information on local health updates?
Residents can visit the Renfrew County and District Health Unit website for comprehensive disease prevention tips and updates.
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