Effect of aerial insecticide spraying on West Nile virus disease--north-central Texas, 2012.
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.
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.
Duke J
DJ
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.
Shelley
S
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.
Nicole
N
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.
Janet
J
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.
Satish K
SK
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.
Kalanthe
K
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.
Mark
M
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.
Brad J
BJ
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.
Tom
T
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.
James
J
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.
Roger
R
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.
Marc
M
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 shills@cdc.gov.
Susan L
SL
Hills
D000401:Aircraft; D000818:Animals; D003465:Culex; D004196:Disease Outbreaks / Q000517:prevention & control*; D006801:Humans; D015994:Incidence; D007303:Insect Vectors; D007306:Insecticides; D011722:Pyrethrins; D013781:Texas / Q000453:epidemiology; D014901:West Nile Fever / Q000453:epidemiology* / Q000821:virology; D014902:West Nile virus / Q000502:physiology
D007306:Insecticides; D011722:Pyrethrins