Human cases of West Nile virus climbs to 495 in 2004

CAL/AAEM News Service calaaem_news at
Thu Aug 19 00:52:25 PDT 2004

West Nile Virus Activity --- United States, August 4--10, 2004

August 13, 2004

During August 4--10, a total of 89 cases of human West Nile virus (WNV) illness were
reported from 14 states (Alabama, Arizona, California, Florida, Illinois, Kentucky,
Louisiana, Minnesota, Mississippi, Missouri, New Mexico, North Dakota, South Dakota, and

During 2004, a total of 24 states have reported a total of 495 cases of human WNV illness
to CDC through ArboNET (Table, Figure). Of these, 274 (55%) cases were reported from
Arizona. A total of 281 (58%) of the 495 cases occurred in males; the median age of
patients was 51 years (range: 1 month--99 years). Illness onset ranged from April 20 to
August 3; 10 cases were fatal. 

A total of 46 presumptive West Nile viremic blood donors (PVDs) have been reported to
ArboNET in 2004. Of these, 33 (72%) were reported from Arizona, seven from California,
three from South Dakota, and one each from Colorado, Iowa, and New Mexico. Of the 46
PVDs, two persons aged 66 and 69 years subsequently had neuroinvasive illness, and seven
persons (median age: 55 years; range: 22--72 years) subsequently had West Nile fever. 

In addition, during 2004, a total of 2,171 dead corvids and 342 other dead birds with WNV
infection have been reported from 35 states. WNV infections have been reported in horses
from 24 states (Alabama, Arizona, Arkansas, California, Colorado, Florida, Idaho,
Illinois, Iowa, Kentucky, Minnesota, Mississippi, Missouri, Nevada, New Mexico, North
Carolina, Ohio, Oklahoma, South Dakota, Tennessee, Texas, Virginia, Wisconsin, and
Wyoming) and in a dog from New Mexico. Two unidentified animal species with WNV infection
were reported from Illinois and Nevada. WNV seroconversions have been reported in 336
sentinel chicken flocks from seven states (Arizona, California, Delaware, Florida,
Louisiana, Nebraska, and Nevada) and in two wild hatchling birds from Ohio. Three
seropositive sentinel horses were reported from Puerto Rico. A total of 2,216
WNV-positive mosquito pools have been reported from 27 states (Arizona, Arkansas,
California, Colorado, Connecticut, Georgia, Illinois, Indiana, Kansas, Kentucky,
Louisiana, Maryland, Michigan, Mississippi, Missouri, Nebraska, Nevada, New Jersey, New
Mexico, New York, Ohio, Pennsylvania, South Dakota, Tennessee, Texas, Utah, and

Additional information about national WNV activity is available from CDC at and at

Source: Morbidity and Mortality Weekly Report, CDC.

Cyrus Shahpar & Brian Potts 
Managing Editors, CAL/AAEM News Service 

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