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Volume 11, Number 8—August 2005

Perspective

Epidemiology and Transmission Dynamics of West Nile Virus Disease

Edward B. Hayes*Comments to Author , Nicholas Komar*, Roger S. Nasci*, Susan P. Montgomery*, Daniel R. O'Leary*, and Grant L. Campbell*
Author affiliations: *Centers for Disease Control and Prevention, Fort Collins, Colorado, USA

Main Article

Table 2

West Nile virus (WNV)–positive mosquito pools, by species, United States, 2001–2004*

2001
2002
2003
2004 (through 11/30/2004)
Positive pools, n = 612† Positive pools, n = 3,720† Positive pools, n = 5,538† Positive pools, n = 4,755†
Species
% of pools
Species
% of pools
Species
% of pools
Species
% of pools
Culex pipiens 57.0 Cx. pipiens 47.0 Cx. tarsalis 31.5 Cx. quinquefasciatus 51.4
Cx. restuans 12.4 Cx. quinquefasciatus 19.1 Cx. pipiens 20.8 Cx. tarsalis 20.4
Cx. salinarius 11.4 Cx. restuans 9.1 Cx. quinquefasciatus 19.1 Cx. pipiens 12.7
Culiseta melanura 4.2 Cx. tarsalis 7.6 Cx. restuans 15.3 Cx. restuans 4.4
Cx. quinquefasciatus 2.1 Cx. salinarius 3.6 Cx. salinarius 4.5 Cx. erythrothorax 3.6
Ochlerotatus. triseriatus 2.1 Aedes albopictus 2.0 Ae. vexans 2.3
21 other species‡ 10.6 23 other species‡ 11.5 35 other species‡ 6.4 35 other species‡ 7.5

*Data were derived from reports submitted by state health departments to the Centers for Disease Control and Prevention's Arbonet surveillance system. Mosquito specimens were collected, identified, and tested in the respective state surveillance systems. Pools were reported as positive if they contained detectable levels of one of the following: infectious WNV, WNV RNA, WN viral antigen.
†Includes only WNV-positive pools reported as monospecific, i.e., excludes mixed pools (e.g., Cx. pipiens/restuans) or pools identified only to genus (e.g., Culex species).
‡No other species individually comprised ≥2.0% of the WNV-positive pools.

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