Volume 88, Issue 5
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



A study of West Nile virus (WNV) ecology was conducted in St. Tammany Parish, Louisiana, from 2002 to 2004. Mosquitoes were collected weekly throughout the year using Centers for Disease Control and Prevention (CDC) light traps placed at 1.5 and 6 m above the ground and gravid traps. A total of 379,466 mosquitoes was collected. WNV was identified in 32 pools of mosquitoes comprising four species; 23 positive pools were from collected during 2003. Significantly more positive pools were obtained from collected in traps placed at 6 m than 1.5 m that year, but abundance did not differ by trap height. In contrast, abundance was significantly greater in traps placed at 6 m in 2002 and 2004. Annual temporal variation in peak seasonal abundance has important implications for WNV transmission in Louisiana. One WNV-positive pool, from , was collected during the winter of 2004, showing year-round transmission. The potential roles of additional mosquito species in WNV transmission in southeastern Louisiana are discussed.


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  • Received : 16 Feb 2012
  • Accepted : 21 Nov 2012
  • Published online : 01 May 2013

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