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West Nile Virus Activity --- United States, July 24--30, 2003

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET as of 3 a.m., Mountain Daylight Time, July 30, 2003.

During the reporting week of July 24--30, a total of 32 human cases of WNV infection were reported from seven states (Alabama, Colorado, Florida, Louisiana, Mississippi, South Dakota, and Texas). During the same period, WNV infections were reported in 277 dead corvids (crows and related species), 70 other dead birds, 36 horses, one dog, one unidentified animal species, and 352 mosquito pools.

During 2003, a total of 44 human cases of WNV infection have been reported from Texas (n = 11), Louisiana (n = 10), Alabama (n = six), Colorado (n = four), Florida (n = four), South Dakota (n = four), Iowa (n = one), Minnesota (n = one), Mississippi (n = one), Ohio (n = one), and South Carolina (n = one) (Figure). Among 43 (98%) cases for which demographic data were available, 27 (63%) occurred among men; the median age was 55 years (range: 5--87 years), and the dates of illness onset ranged from May 29 to July 19. In addition, 828 dead corvids and 220 other dead birds with WNV infection were reported from 36 states; 90 WNV infections in horses have been reported from 19 states (Alabama, Arkansas, Colorado, Florida, Georgia, Kansas, Kentucky, Minnesota, Missouri, Montana, Nebraska, New Mexico, North Carolina, North Dakota, Oklahoma, South Dakota, Texas, Wisconsin, and Wyoming), one infection was reported in an unidentified species (Florida), and two WNV infections were reported in dogs (Florida and South Dakota). During 2003, WNV seroconversions have been reported in 86 sentinel chicken flocks from six states (Colorado, Florida, Iowa, Louisiana, North Carolina, and Nebraska). South Dakota and Louisiana each reported three seropositive sentinel horses; 679 WNV-positive mosquito pools have been reported from 18 states (Colorado, Connecticut, Georgia, Illinois, Indiana, Kansas, Louisiana, Maryland, Massachusetts, Michigan, Mississippi, Nebraska, New Jersey, South Dakota, Tennessee, Texas, Virginia, and Wisconsin).

Additional information about WNV activity is available from CDC at and


Figure 1
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