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West Nile Virus Activity --- United States, August 7--13, 2003

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET as of 3 a.m., Mountain Daylight Time, August 13, 2003.

During the reporting week of August 7--13, a total of 240 human cases of WNV infection were reported from 18 states (Alabama, Arkansas, Colorado, Georgia, Iowa, Kentucky, Louisiana, Minnesota, Mississippi, Missouri, New Mexico, North Dakota, Oklahoma, Pennsylvania, South Dakota, Texas, Wisconsin, and Wyoming), including five fatal cases from two states (Alabama and Colorado). During the same period, WNV infections were reported in 492 dead birds, 212 horses, one squirrel, and 430 mosquito pools.

During 2003, a total of 393 human cases of WNV infection have been reported from Colorado (n = 195), South Dakota (n = 51), Texas (n = 39), Louisiana (n = 21), Mississippi (n = 14), Pennsylvania (n = 12), Alabama (n = 10), Minnesota (n= seven), Ohio (n = seven), Nebraska (n = six), North Dakota (n= six), Florida (n = four), Iowa (n = four), Kentucky (n = three), New Mexico (n = three), Wyoming (n = three), Oklahoma (n = two), Arkansas (n = one), Georgia (n = one), Kansas (n = one), Missouri (n = one), South Carolina (n = one), and Wisconsin (n = one) (Figure). Among 383 (97%) cases for which demographic data were available, 213 (54%) occurred among men; the median age was 46 years (range: 17 months--89 years). Of the 393 cases, nine fatal cases were reported from Colorado (n = five), Alabama (n = two), and Texas (n = two). In addition, 2,262 dead birds with WNV infection were reported from 38 states and New York City; 403 WNV infections in horses have been reported from 27 states (Alabama, Arkansas, Colorado, Delaware, Florida, Georgia, Iowa, Kansas, Kentucky, Maryland, Minnesota, Mississippi, Missouri, Montana, Nebraska, New Mexico, North Carolina, North Dakota, Oklahoma, Pennsylvania, South Carolina, South Dakota, Tennessee, Texas, Virginia, Wisconsin, and Wyoming), three WNV infections were reported in dogs, one infection was reported in a squirrel, and five infections were reported in unidentified animal species. During 2003, WNV seroconversions have been reported in 261 sentinel chicken flocks from 10 states (Colorado, Delaware, Florida, Georgia, Iowa, Louisiana, Nebraska, North Carolina, Pennsylvania, and Virginia). Louisiana and South Dakota each reported three seropositive sentinel horses. A total of 1,468 WNV-positive mosquito pools have been reported from 28 states (Arkansas, Arizona, Colorado, Connecticut, Georgia, Illinois, Indiana, Kansas, Kentucky, Louisiana, Massachusetts, Maryland, Michigan, Minnesota, Missouri, Mississippi, Montana, Nebraska, New Jersey, North Dakota, Ohio, Oklahoma, Pennsylvania, 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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