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  • NSMAD Weekly Report


    October 12, 2018

    Please click here to read the NSMAD Surveillance Summary for 2018.

  • Informational


    September 25, 2018

    Chicago Area Experiencing Excessive Biting Mosquito  Activity

    Populations of mosquitoes within the NSMAD are high at this time. Our surveillance indicates that the most abundant mosquito species present is the inland floodwater mosquito (Aedes vexans). This brood of mosquitoes is a result of the heavy precipitation during the last week of August when the area received almost three inches of rain. While the inland floodwater mosquito is a serious nuisance and bites aggressively at all hours of the day and night, it is not a vector of West Nile virus. Populations of the mosquito that can transmit West Nile virus (Culex pipiens) remain low at this time. Additionally, the West Nile virus infection rate and vector index are below thresholds where transmission to humans tends to occur. While the risk from WNV is low, personal protective measures such as long-sleeve clothing and the use of a mosquito repellant are still recommended to minimize bites from all mosquitoes.

    We are doing our best to perform adult control operations throughout the District when conditions are favorable for effective control. High winds (>10 mph), cool night time temperatures (<65°F) and rain prevent these treatments from occurring. The forecast for the next few nights calls for a combination of cool temperatures, high winds and possibly, rain.  Adult mosquito control operations will commence if weather conditions and mosquito abundance indicate these operations would be effective.


Our Mission

The NSMAD manages local mosquito populations to:
• Reduce the risk of disease from mosquito-borne viruses.
• Minimize the negative impact mosquitoes have on the quality of life in the District.


You can help us minimize your exposure to mosquito bites by reporting standing water and excessive biting mosquito activity.