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West Nile Virus Activity --- United States, July 31--August 6, 2003

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET as of 3 a.m., Mountain Daylight Time, August 6, 2003.

During the reporting week of July 31--August 6, a total of 109 human cases of WNV infection were reported from 13 states (Colorado, Iowa, Kansas, Kentucky, Louisiana, Minnesota, Mississippi, Nebraska, New Mexico, North Dakota, Ohio, South Dakota, and Texas), including four fatal cases from three states (Alabama, Colorado, and Texas). During the same period, WNV infections were reported in 622 dead birds, 191 horses, one dog, four unidentified animal species, and 359 mosquito pools.

During 2003, a total of 153 human cases of WNV infection have been reported from Colorado (n = 72), Texas (n = 19), Louisiana (n = 15), South Dakota (n = eight), Ohio (n = seven), Alabama (n = six), Nebraska (n= six), Florida (n = four), Minnesota (n = four), Mississippi (n = four), Iowa (n = two), New Mexico (n = two), Kansas (n = one), Kentucky (n = one), North Dakota (n = one), and South Carolina (n = one) (Figure). Among 150 (98%) cases for which demographic data were available, 81 (54%) occurred among men; the median age was 45 years (range: 17 months--87 years). Of the 153 cases, four fatal cases were reported from Alabama (n = one), Colorado (n = one), and Texas (n = two). In addition, 1,770 dead birds with WNV infection were reported from 36 states and New York City; 282 WNV infections in horses have been reported from 22 states (Alabama, Arkansas, Colorado, Florida, Georgia, Kansas, Kentucky, Minnesota, Mississippi, Missouri, Montana, Nebraska, New Mexico, North Carolina, North Dakota, Oklahoma, South Dakota, Tennessee, Texas, Virginia, Wisconsin, and Wyoming), three WNV infections were reported in dogs, and five infections were reported in unidentified animal species. During 2003, WNV seroconversions have been reported in 185 sentinel chicken flocks from eight states (Colorado, Florida, Georgia, Iowa, Louisiana, Nebraska, North Carolina, and Virginia). Louisiana and South Dekota each reported three seropositive sentinel horses. A total of 1038 WNV-positive mosquito pools have been reported from 20 states (Colorado, Connecticut, Georgia, Illinois, Indiana, Kansas, Louisiana, Maryland, Massachusetts, Michigan, Mississippi, Missouri, Nebraska, New Jersey, North Dakota, South Dakota, Tennessee, Texas, Virginia, and Wisconsin) and New York City.

Additional information about WNV activity is available from CDC at and


Figure 1
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