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West Nile Virus Activity --- United States, July 17--23, 2003

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET as of 8 a.m., Mountain Daylight Time, July 23, 2003.

During the reporting week of July 17--23, six human cases of WNV infection were reported from five states (Iowa, Minnesota, Ohio, South Dakota, and Texas). During the same period, WNV infections were reported in 309 dead corvids (crows and related species), 69 other dead birds, 12 horses, and 144 mosquito pools.

During 2003, a total of 11 human cases of WNV infection have been reported from Texas (n = five), Alabama (n = one), Iowa (n = one), Minnesota (n = one), Ohio (n = one), South Carolina (n = one), and South Dakota (n = one) (Figure). Among these cases, seven (64%) occurred among men; the median age was 70 years (range: 42--80 years), and the dates of illness onset ranged from May 29 to July 13. In addition, 551 dead corvids and 150 other dead birds with WNV infection were reported from 34 states; 55 WNV infections in horses have been reported from 16 states (Alabama, Arkansas, Colorado, Georgia, Kansas, Kentucky, Minnesota, Missouri, Nebraska, New Mexico, North Carolina, North Dakota, Oklahoma, Texas, Wisconsin, and Wyoming), and one WNV infection was reported in a dog (South Dakota). During 2003, WNV seroconversions have been reported in 56 sentinel chicken flocks from Florida, Iowa, and North Carolina. South Dakota reported three seropositive sentinel horses; 327 WNV-positive mosquito pools have been reported from 15 states (Colorado, Georgia, Illinois, Indiana, Kansas, Maryland, Massachusetts, Michigan, Mississippi, Nebraska, New Jersey, South Dakota, Texas, Virginia, and Wisconsin).

Additional information about WNV activity is available from CDC at and


Figure 1
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