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West Nile Virus Activity --- United States, July 3--9, 2003

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET as of 8 a.m. Mountain Daylight Time, July 9, 2003.

During the reporting week of July 3--9, the first verified human case of WNV meningoencephalitis in 2003 was reported from South Carolina in a man aged 70 years. The date of onset of illness was May 29.

During 2003, in addition to the one human case of WNV meningoencephalitis, 130 corvids (crows and related species) and 63 other dead birds with WNV infection were reported from 28 states (Figure); 22 WNV infections were reported in horses from Texas (n = four), Minnesota (n = three), Oklahoma (n = three), Wyoming (n = three), Kentucky (n = two), Wisconsin (n = two), Alabama (n = one), Arkansas (n = one), Georgia (n = one), Missouri (n = one), and North Dakota (n = one). One canine infection was reported from South Dakota. WNV seroconversions were reported in 55 sentinel chicken flocks from Florida and North Carolina. South Dakota reported nine seropositive sentinel horses. Fifty-three WNV-positive mosquito pools were reported from eight states (Colorado, Georgia, Illinois, Indiana, Kansas, Michigan, New Jersey, and Texas).

Additional information about WNV activity is available from CDC at and


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