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Volume 10, Number 9—September 2004
Dispatch

Year-round West Nile Virus Activity, Gulf Coast Region, Texas and Louisiana

Robert B. Tesh*Comments to Author , Ray Parsons†, Marina Siirin*, Yvonne Randle†, Chris Sargent†, Hilda Guzman*, Taweesak Wuithiranyagool†, Stephen Higgs*, Dana L. Vanlandingham*, Adil A. Bala†, Keith Haas‡, and Brian Zerinque§
Author affiliations: *University of Texas Medical Branch, Galveston, Texas, USA; †Harris County Public Health and Environmental Services, Houston, Texas, USA; ‡Galveston County Mosquito Control District, Dickinson, Texas, USA; §Mosquito Control Contractors, Inc., New Iberia, Louisiana, USA

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Table 1

Monthly summary of dead birds and mosquitoes tested for West Nile virus (WNV) in Harris County, Texas

Year/month Mean 
temperature (°C)a Total birds tested No. WNV-positive 
(% positive) Total mosquitoes tested No. WNV-positive mosquito poolsb WNV minimum infection rate
2003
  January 10.6 46 0 2,164 0 0.00
  February 12.5 62 0 1,146 0 0.00
  March 16.7 80 0 5,304 0 0.00
  April 21.4 98 1 (1.0) 39,000 0 0.00
  May 27.1 213 4 (1.9) 58,698 2 0.03
  June 27.9 219 33 (15.1) 42,041 40 0.95
  July 28.2 205 72 (35.1) 54,582 203 3.72
  August 28.9 164 83 (50.6) 40,184 128 3.19
  September 25.5 127 38 (29.9) 34,691 21 0.61
  October 22.2 73 11 (15.1) 41,465 4 0.10
  November 18.7 20 2 (10) 7,562 2 0.13
  December 12.6 7 1 (14.3) 8,411 0 0.00
2004
  January 13.2 26 1 (3.8) 12,816 0 0.00
  February 12.3 146 3 (2.1) 9,790 0 0.00
  March 19.5 137 1 (0.7) 14,714 0 0.00
Total 1,623 250 (15.4) 372,568 400 1.07

aMean monthly temperature in Houston (Harris County) (11).
bMean pool size was 28.2 mosquitoes/pool.

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References
  1. Nash  D, Mostashari  F, Fine  A, Miller  J, O’Leary  D, Murray  K, The outbreak of West Nile infection in the New York City area in 1999. N Engl J Med. 2001;344:180714. DOIPubMedGoogle Scholar
  2. Reeves  WC. Overwintering of arthropod-borne viruses. Prog Med Virol. 1961;3:5978.PubMedGoogle Scholar
  3. Tesh  RB. Transovarial transmission of arboviruses in their invertebrate vectors. In: Harris KG, editor. Current topics in vector research, Vol. 2. New York: Praeger Scientific; 1984. p. 57–76.
  4. Reeves  WC. Overwintering of arboviruses. In: Reeves WC, Asman SM, Hardy JL, Milby MM, Reisen WK, editors. Epidemiology and control of mosquito-borne arboviruses in California, 1943–1987. Sacramento: California Mosquito and Vector Control Association, Inc; 1990. p. 357–82.
  5. Reiter  P. Weather, vector biology and arboviral recrudescence. In: Monath TP, editor. The arboviruses: epidemiology and ecology, Vol. 1. Boca Raton (FL): CRC Press; 1988. p. 245–55.
  6. Nasci  RS, Savage  HM, White  DJ, Miller  J, Cropp  BC, Godsey  MS, West Nile in overwintering Culex mosquitoes, New York City, 2000. Emerg Infect Dis. 2001;7:7424. DOIPubMedGoogle Scholar
  7. Garmendia  AE, Van Kruiningen  HJ, Franch  RA, Anderson  JF, Andreadis  TG, Kumar  A, Recovery and identification of West Nile virus from a hawk in winter. J Clin Microbiol. 2000;38:31101.PubMedGoogle Scholar
  8. Bailey  CL, Eldridge  BF, Hayes  DE, Watts  DM, Tammariello  RF, Dalrymple  JM. Isolation of St. Louis encephalitis virus from overwintering Culex pipiens mosquitoes. Science. 1978;199:13469. DOIPubMedGoogle Scholar
  9. Lillibridge  KM, Parsons  R, Randle  Y, Travassos da Rosa  APA, Guzman  H, Siirin  M, The 2002 introduction of West Nile virus into Harris County, Texas, an area historically endemic for St. Louis encephalitis. Am J Trop Med Hyg. 2004;70:67681.PubMedGoogle Scholar
  10. Davis  CT, Beasley  DWC, Guzman  H, Pushker  R, D’Anton  M, Novak  RJ, Genetic variation among temporally and geographically distinct West Nile virus isolates, United States, 2001, 2002. Emerg Infect Dis. 2003;9:14239.PubMedGoogle Scholar
  11. National Climatic Data Center. Climate at a glance: Houston, TX, 2004. [cited Jun 29, 2004]. Available from: http://www.ncdc.noaa.gov/oa/climate/research/caz/V1.html
  12. Campbell  GL, Marfin  AA, Lanciotti  RS, Gubler  DJ. West Nile virus. Lancet Infect Dis. 2002;2:51929. DOIPubMedGoogle Scholar
  13. Spielman  A. Structure and seasonality of nearctic Culex pipiens populations. Ann N Y Acad Sci. 2001;951:22033. DOIPubMedGoogle Scholar
  14. Guptill  SC, Julian  KG, Campbell  GL, Price  SD, Marfin  AA. Early-season avian deaths from West Nile virus as warnings of human infection. Emerg Infect Dis. 2003;9:4834.PubMedGoogle Scholar
  15. Milby  MM, Reeves  WC. Natural infection in vertebrate hosts other than man. In: Reeves WC, Asman SM, Hardy JL, Milby MM, Reisen WK, editors. Epidemiology and control of mosquito-borne arboviruses in California, 1943–1987. Sacramento: California Mosquito and Vector Control Association, Inc.; 1990. p. 26–65.

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