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Weekly Update: West Nile Virus Activity --- United States, July 10--16, 2003

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET as of 7 a.m. Mountain Daylight Time, July 16, 2003.

During the reporting week of July 10--16, four human cases of WNV infection were reported from two states (Alabama and Texas). During the same period, WNV infections were reported in 112 dead corvids (crows and related species), 18 other dead birds, 20 horses, and 130 mosquito pools.

During 2003, a total of five human cases of WNV infection have been reported from Texas (n = three), Alabama (n = one), and South Carolina (n = one) (Figure). Among these cases, three (60%) occurred among men; the median age was 64 years (range: 42--73 years), and the dates of illness onset ranged from May 29 to June 24. In addition, 242 dead corvids and 81 other dead birds with WNV infection were reported from 29 states; 42 WNV infections in horses have been reported from 14 states (Alabama, Arkansas, Georgia, Kansas, Kentucky, Minnesota, Missouri, 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 nine seropositive sentinel horses; 183 WNV-positive mosquito pools have been reported from 10 states (Colorado, Georgia, Illinois, Indiana, Kansas, Michigan, Mississippi, Nebraska, New Jersey, and Texas).

Additional information about WNV activity is available from CDC at and


Figure 1
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