Weekly West Nile Virus Test Results

Week of July 9, 2017 

This week Forest Preserve District staff collected 1 positive West Nile virus sample(s). This brings the total number of positive West Nile virus sample(s) for the 2017 season to 3. District staff began sampling for the presence of West Nile virus on June 1, 2017.

The positive sample(s) this week were obtained from mosquitoes collected in the following preserves: Green Meadows in Westmont. Please click on the preserve name to view detailed aerial photos of these sites. Or view the locations in a county-wide map. Though infected mosquitoes were collected from District traps located in these preserves, these mosquitoes may have originated from off-preserve breeding sites. Known District breeding sites that are near these positive samples are treated with a biologically derived larvicide to reduce the Culex mosquito population. Ongoing surveillance of these areas will continue in order to identify and treat all District locations that may be harboring Culex mosquito larvae.

Currently, the District is aware of 17 positive mosquito samples in DuPage County, 1 of which have been found on District property this week. To date the DuPage County Health Department has reported 0 positive human cases for DuPage County. The DuPage County Health Department provides an interactive West Nile virus case map

As of this week, the Illinois Department of Public Health has reported 0 human cases, 4 positive birds, and 137 positive mosquito batches in Illinois. Here's up-to-date IDPH mosquito surveillance data


Simple, common sense precautions people can take to avoid mosquito bites and protect themselves from 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.

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