Ottawa, IL – Mosquitoes collected in Marseilles have tested positive for West Nile virus, marking the first confirmed West Nile activity in LaSalle County for 2025.
According to the LaSalle County Health Department, mosquitoes were collected on Tuesday and tested by Environmental Health staff, who confirmed the results Wednesday. Jennifer Arroyo, Director of Environmental Health, said this time of year typically brings increased risk for West Nile virus activity. “The rain we have experienced recently could contribute to areas of standing water and mosquito breeding,” she said, urging residents to wear insect repellent, especially during evening hours.
West Nile virus is spread through the bite of infected Culex mosquitoes. While many people show no symptoms, the virus can cause fever, nausea, and in rare cases, serious neurological conditions such as encephalitis or meningitis. Those over 60 and individuals with weakened immune systems are at greater risk of severe illness.
The Illinois Department of Public Health recommends the “Three R’s” for preventing West Nile exposure:
- Reduce standing water and keep screens intact to limit mosquito breeding.
- Repel bites by using EPA-approved repellents containing DEET, picaridin, or oil of lemon eucalyptus.
- Report stagnant water or neglected areas to local authorities for mosquito control.
Residents can track local virus statistics by visiting www.lasallecountyil.gov under Environmental Health. Statewide data is available at the Illinois Department of Public Health’s website.
Local authorities, including the Marseilles Police Department, are urging the public to take precautions.
This article was produced by a journalist and may include AI-assisted input. All content is reviewed for accuracy and fairness.
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