Combined Sewage Overflows (CSO) Are Major Urban Breeding Sites for Culex quinquefasciatus in Atlanta, Georgia

Lisa M. Calhoun Division of Parasitic Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia

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Melissa Avery Division of Parasitic Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia

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LeeAnn Jones Division of Parasitic Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia

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Karina Gunarto Division of Parasitic Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia

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Raymond King Division of Parasitic Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia

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Jacquelin Roberts Division of Parasitic Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia

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Thomas R. Burkot Division of Parasitic Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia

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A longitudinal study of mosquito ecology in Tanyard Creek, an urban stream in Atlanta, GA, that receives combined storm and waste water effluent from the Atlanta combined sewage overflow system, was undertaken in 2006. Culex quinquefasciatus was the dominant species found, but Culex restuans was also abundant during the spring with limited numbers of Culex nigripalpis and Anopheles punctipennis also collected. Significant differences in mosquito densities were found with greater densities associated with side pools of water and stagnant water. Mosquito numbers are regulated largely by flooding of the stream by effluent discharges exceeding 15 kgal/min. These floods are associated with significant immediate reductions, but not complete elimination, of mosquitoes from Tanyard Creek. Mosquito numbers rebound within 5–10 days after such floods and rapidly reach high densities.

Author Notes

Reprint requests: Tom Burkot, Division of Parasitic Diseases, Centers for Disease Control and Prevention, 4770 Buford Hwy., MS F-42, Atlanta, GA 30341, E-mail: Tburkot@cdc.gov.
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