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Mosquito Management

Learn About Our Mosquito Management Program


2024 Weekly Mosquito Monitoring Report

The Forest Preserve District began testing forest preserves for West Nile virus on June 3.

Week of July 1

Positive Tests in Du Page Forest Preserves This Week


Forest Preserve District staff collected one positive West Nile virus sample this week at Waterfall Glen in Darien.

Positive Sample Locations (PDF)

Total Positive Tests in Du Page Forest Preserves in 2024


There have been two positive West Nile virus samples in the preserves this season.

Positive Samples in Du Page County


Currently, the District is aware of seven positive mosquito samples in DuPage County, one of which was found on District property this past week.

DuPage County Surveillance Maps

Reported Human Cases in Illinois


As of July 5, the Illinois Department of Public Health has not reported any human cases in Illinois.

Zero Human Deaths

11 Positive Birds

100 Positive Mosquito Batches

Illinois West Nile Virus Numbers At A Glance

Fight the Bite

Here are some simple, common sense precautions people can take to avoid mosquito bites and protect themselves against West Nile virus:
  • Avoid being outdoors when mosquitoes are most active, especially between dusk and dawn.
  • When outdoors, wear shoes and socks, long pants and a long-sleeved shirt, and apply insect repellent that includes DEET, picaridin, oil of lemon eucalyptus or IR 3535 according to label instructions. Consult a physician before using repellents on infants.
  • Make sure doors and windows have tight-fitting screens. Repair or replace screens that have tears or other openings. Try to keep doors and windows shut, especially at night.
  • Eliminate all sources of standing water that can support mosquito breeding, including water in bird baths, ponds, flowerpots, wading pools, old tires and any other receptacles. In areas outside of Forest Preserve property, contact your municipal government to report stagnant water in roadside ditches, flooded yards and similar locations that may produce mosquitoes.
  • Public health officials believe that a hot, dry summer could increase mosquito activity and the risk of disease from West Nile virus.