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Update: West Nile Virus Activity --- United States, 2005

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through Arbo-NET as of 3 a.m. Mountain Daylight Time, October 4, 2005.

Forty-one states have reported 2,016 cases of human WNV illness in 2005 (Figure and Table 1). By comparison, in 2004, a total of 1,865 WNV cases had been reported as of October 5, 2004 (Table 2). A total of 1,058 (57%) of the 1,865 cases for which such data were available in 2005 occurred in males; the median age of patients was 51 years (range: 3 months--98 years). Date of illness onset ranged from January 2 to September 29; a total of 55 cases were fatal.

A total of 345 presumptive West Nile viremic blood donors (PVDs) have been reported to ArboNET during 2005. Of these, 92 were reported from California; 52 from Nebraska; 50 from Texas; 22 each from Arizona and Louisiana; 19 from Kansas; 16 from South Dakota; 11 from Iowa; 10 from Minnesota; nine from Illinois; seven from Oklahoma; five from New Mexico; four each from Alabama, Pennsylvania, and Utah; three from Michigan; two each from Colorado, Mississippi, Nevada, and Wisconsin; and one each from Idaho, Montana, New York, North Carolina, North Dakota, Ohio, and Oregon. Of the 345 PVDs, three persons aged 53, 56, and 72 years subsequently had neuroinvasive illness; seven persons (median age: 25 years) subsequently had other illnesses; and 76 persons (median age: 46 years [range: 17--78 years]) subsequently had West Nile fever.

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


Figure

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Table 1

Table 1
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Table 2

Table 2
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Date last reviewed: 10/5/2005

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