West Nile Monitoring Report

2020 Weekly Mosquito Monitoring Report

Week of Sept. 7, 2020

This week Forest Preserve District staff collected 0 positive West Nile virus samples this week. This brings the total number of positive West Nile virus samples for the 2020 season to 5. District staff began sampling for the presence of West Nile virus on June 1, 2020.

While the District collected no positive samples this week, a positive sample was obtained by the DuPage County Health Department near Churchill Woods in Glen Ellyn. The DuPage County Health Department is also reporting the first two human cases of West Nile virus in Illinois, both of which occurred in DuPage County.

Currently, the District is aware of 73 positive mosquito samples in DuPage County, 0 of which was found on District property. To date the DuPage County Health Department has reported 2 positive human cases for DuPage County. The DuPage County Health Department provides West Nile virus surveillance maps (link).

As of Sept. 11, 2020, the Illinois Department of Public Health has reported 2 human cases, 0 human deaths, 6 positive birds and 1,958 positive mosquito batches in Illinois. See the latest up-to-date IDPH mosquito surveillance data (link).


Fight the Bite

Below are some simple, common sense precautions people can take to avoid mosquito bites and protect themselves against West Nile virus:

1. Avoid being outdoors when mosquitoes are most active, especially between dusk and dawn.

2. 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.

3. 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.

4. 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.

5. Public health officials believe that a hot, dry summer could increase mosquito activity and the risk of disease from West Nile virus.

For more tips, visit: