Effect of Aerial Insecticide Spraying on West Nile Virus Disease—North-Central Texas, 2012

Duke J. Ruktanonchai Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia; Health Service Region 2/3, Texas Department of State Health Services, Arlington, Texas; Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Zoonosis Control Branch, Texas Department of State Health Services, Austin, Texas

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Shelley Stonecipher Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia; Health Service Region 2/3, Texas Department of State Health Services, Arlington, Texas; Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Zoonosis Control Branch, Texas Department of State Health Services, Austin, Texas

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Nicole Lindsey Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia; Health Service Region 2/3, Texas Department of State Health Services, Arlington, Texas; Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Zoonosis Control Branch, Texas Department of State Health Services, Austin, Texas

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Janet McAllister Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia; Health Service Region 2/3, Texas Department of State Health Services, Arlington, Texas; Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Zoonosis Control Branch, Texas Department of State Health Services, Austin, Texas

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Satish K. Pillai Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia; Health Service Region 2/3, Texas Department of State Health Services, Arlington, Texas; Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Zoonosis Control Branch, Texas Department of State Health Services, Austin, Texas

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Kalanthe Horiuchi Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia; Health Service Region 2/3, Texas Department of State Health Services, Arlington, Texas; Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Zoonosis Control Branch, Texas Department of State Health Services, Austin, Texas

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Mark Delorey Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia; Health Service Region 2/3, Texas Department of State Health Services, Arlington, Texas; Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Zoonosis Control Branch, Texas Department of State Health Services, Austin, Texas

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Brad J. Biggerstaff Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia; Health Service Region 2/3, Texas Department of State Health Services, Arlington, Texas; Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Zoonosis Control Branch, Texas Department of State Health Services, Austin, Texas

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Tom Sidwa Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia; Health Service Region 2/3, Texas Department of State Health Services, Arlington, Texas; Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Zoonosis Control Branch, Texas Department of State Health Services, Austin, Texas

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James Zoretic Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia; Health Service Region 2/3, Texas Department of State Health Services, Arlington, Texas; Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Zoonosis Control Branch, Texas Department of State Health Services, Austin, Texas

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Roger Nasci Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia; Health Service Region 2/3, Texas Department of State Health Services, Arlington, Texas; Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Zoonosis Control Branch, Texas Department of State Health Services, Austin, Texas

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Marc Fischer Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia; Health Service Region 2/3, Texas Department of State Health Services, Arlington, Texas; Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Zoonosis Control Branch, Texas Department of State Health Services, Austin, Texas

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Susan L. Hills Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia; Health Service Region 2/3, Texas Department of State Health Services, Arlington, Texas; Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Zoonosis Control Branch, Texas Department of State Health Services, Austin, Texas

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DOI:
https://doi.org/10.4269/ajtmh.14-0072
Volume/Issue:
Volume 91: Issue 2
Page(s):
240–245
Restricted access
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During 2012, four north-central Texas counties experienced high West Nile virus (WNV) disease incidence. Aerial insecticide spraying was conducted in two counties. To evaluate the effect of spraying on WNV disease, we calculated incidence rate ratios (IRRs) in treated and untreated areas by comparing incidence before and after spraying; for unsprayed areas, before and after periods were defined by using dates from a corresponding sprayed area. In treated areas, WNV neuroinvasive disease incidence before and after spraying was 7.31/100,000 persons and 0.28/100,000 persons, respectively; the IRR was 26.42 (95% confidence interval [CI]: 12.42–56.20). In untreated areas, the before and after incidence was 4.80/100,000 persons and 0.45/100,000 persons, respectively; the IRR was 10.57 (95% CI: 6.11–18.28). The ratio of IRRs was 2.50 (95% CI: 0.98–6.35). Disease incidence decreased in both areas, but the relative change was greater in aerial-sprayed areas.

Author Notes

* Address correspondence to Susan L. Hills, Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, 3150 Rampart Road, Fort Collins, CO 80521. E-mail: shills@cdc.gov

Authors' addresses: Duke J. Ruktanonchai and Satish K. Pillai, Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, GA, E-mails: DRuktanonchai@cdc.gov and SPillai@cdc.gov. Shelley Stonecipher and James Zoretic, Health Service Region 2/3, Texas Department of State Health Services, Arlington, TX, E-mails: Shelley.Stonecipher@dshs.state.tx.us and James.Zoretic@dshs.state.tx.us. Nicole Lindsey, Janet McAllister, Kalanthe Horiuchi, Mark Delorey, Brad J. Biggerstaff, Roger Nasci, Marc Fischer, and Susan L. Hills, Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, CO, E-mails: NPLindsey@cdc.gov, JMcAllister@cdc.gov, KHoriuchi@cdc.gov, MDelorey@cdc.gov, BBiggerstaff@cdc.gov, RNasci@cdc.gov, Mfischer@cdc.gov, and Shills@cdc.gov. Tom Sidwa, Zoonosis Control Branch, Texas Department of State Health Services, Austin, TX, E-mail: Tom.Sidwa@dshs.state.tx.us.

Copyright:
© The American Society of Tropical Medicine and Hygiene 2014
Received:
03 Feb 2014
|
Accepted:
28 Mar 2014
|
Published Online:
06 Aug 2014
Cover The American Journal of Tropical Medicine and Hygiene
The American Journal of Tropical Medicine and Hygiene
Print ISSN:
0002-9637
Online ISSN:
1476-1645
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