Hamilton raises West Nile virus risk to “moderate” after mosquitoes test positive. Residents urged to remove standing water and use mosquito repellent.
First West Nile Detection in 2025 Triggers Moderate Risk Alert
Hamilton Public Health has confirmed the first positive case of West Nile virus in mosquitoes this year. A routine mosquito trap tested positive this week, prompting the city to elevate the local risk level from “low” to “moderate,” according to a statement issued Friday.
City’s Response to Virus-Carrying Insects
To curb the spread, municipal workers have already completed two rounds of larvicide treatments in catch-basins—Hamilton’s primary mosquito breeding sites. These measures are part of a broader public health effort to reduce the risk of mosquito-borne illnesses across the region.
Public Health Advises Prevention Measures
City officials are urging residents to protect themselves by eliminating standing water around homes and gardens at least once a week. Protective steps also include wearing insect repellent with DEET or Icaridin, avoiding mosquito-dense areas at dusk and dawn, and dressing in long-sleeved shirts and pants when outdoors.
Who’s Most at Risk?
While most people infected with West Nile virus show no symptoms, approximately 20% may develop West Nile fever. This includes flu-like symptoms such as headache, fatigue, and body aches. Older adults and individuals with weakened immune systems are more susceptible to severe outcomes.
Severe Complications Rare But Serious
Roughly one per cent of those infected can suffer from encephalitis or meningitis—inflammation of the brain or its lining. Symptoms may take two days to two weeks to appear post-exposure and can include high fever, neck stiffness, confusion, and muscle weakness.
Ongoing Monitoring and Community Awareness
Hamilton Public Health continues to monitor mosquito populations and conduct regular testing throughout the summer. Residents can stay informed by checking the city’s online West Nile virus updates and participating in local awareness campaigns.
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