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West Nile Virus Activity --- United States, October 30--November 5, 2003

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET as of 3 a.m., Mountain Standard Time, November 5, 2003.

During the reporting week of October 30--November 5, a total of 502 human cases of WNV infection were reported from 24 states (Alabama, Colorado, Illinois, Iowa, Kansas, Maryland, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, New Hampshire, New Jersey, New Mexico, North Carolina, Ohio, Oklahoma, Rhode Island, South Dakota, Tennessee, Texas, West Virginia, and Wyoming), including 16 fatal cases from six states (Colorado, Missouri, Nebraska, Pennsylvania, South Dakota, and Texas). During the same period, WNV infections were reported in 293 dead birds, 473 mosquito pools, 520 horses, five dogs, three squirrels, and six unidentified animal species.

During 2003, a total of 8,219 human cases of WNV infection have been reported from Colorado (n = 2,477), Nebraska (n = 1,594), South Dakota (n = 972), Texas (n = 513), North Dakota (n = 422), Wyoming (n = 339), Montana (n = 220), Pennsylvania (n = 212), New Mexico (n = 199), Minnesota (n = 144), Iowa (n = 143), Ohio (n = 104), Kansas (n = 86), Louisiana (n = 84), Oklahoma (n = 75), New York (n = 67), Mississippi (n = 62), Missouri (n = 59), Illinois (n = 50), Maryland (n = 47), Georgia (n = 36), Alabama (n = 33), Florida (n = 32), Indiana (n = 30), New Jersey (n = 28), North Carolina (n = 24), Tennessee (n = 22), Arkansas (n = 21), Virginia (n = 21), Massachusetts (n = 16), Kentucky (n = 14), Delaware (n = 13), Wisconsin (n = 13), Connecticut (n = 12), Michigan (n = eight), Rhode Island (n = six), Arizona (n = three), District of Columbia (n = three), New Hampshire (n = three), Vermont (n = three), West Virginia (n = three), California (n = two), Nevada (n = two), South Carolina (n = one), and Utah (n = one) (Figure). Of 8,087 (98%) cases for which demographic data were available, 4,253 (53%) occurred among males; the median age was 47 years (range: 1 month--99 years), and the dates of illness onset ranged from March 28 to October 22. Of the 8,087 cases, 182 fatal cases were reported from Colorado (n = 45), Texas (n = 26), Nebraska (n = 21), South Dakota (n = 13), New York (n = eight), Wyoming (n = eight), Pennsylvania (n = seven), Maryland (n = five), Missouri (n = five), Georgia (n = four), Iowa (n = four), Kansas (n = four), Minnesota (n = four), New Mexico (n = four), North Dakota (n = four), Alabama (n = three), Ohio (n = three), Indiana (n = two), Montana (n = two), New Jersey (n = two), Delaware (n = one), Illinois (n = one), Kentucky (n = one), Louisiana (n = one), Michigan (n = one), Mississippi (n = one), Tennessee (n = one), and Virginia (n = one). A total of 713 presumptive West Nile viremic blood donors have been reported to ArboNET, including 621 (87%) from the following nine western and midwestern states: Colorado, Kansas, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas, and Wyoming. Of the 583 donors for whom data were reported completely, six (1%) subsequently had neuroinvasive disease (median age: 45 years; range: 28--76 years), and 89 (15%) had West Nile fever.

In addition, 11,076 dead birds with WNV infection have been reported from 42 states, the District of Columbia, and New York City. WNV infections also have been reported from 41 states in horses (n = 3,991), dogs (n = 21), squirrels (n = 17), and unidentified animal species (n = 31). During 2003, WNV seroconversions have been reported in 1,377 sentinel chicken flocks from 15 states. Of the 61 seropositive sentinel horses reported, Illinois reported 43, West Virginia, eight; Minnesota, seven; and South Dakota, three. In addition, seropositivity was reported from one other unidentified animal species. A total of 7,590 WNV-positive mosquito pools have been reported from 38 states, the District of Columbia, and New York City.

Additional information about WNV activity is available from CDC at http://www.cdc.gov/ncidod/dvbid/westnile/index.htm and http://westnilemaps.usgs.gov.


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