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NSMAD Weekly Report
October 12, 2018
Please click here to read the NSMAD Surveillance Summary for 2018.
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.
Did You Know?
West Nile virus was first detected in the United States in New York in 1999. Learn more about West Nile virus>>
We don’t just spray to reduce the number of adult mosquitoes. 90% of our abatement program is focused on larval control, including the use of mosquito fish that love to eat larvae. Learn more about our larval control methods>>