Dead Crow Reports and Location of Human West Nile Virus Cases, Chicago, 2002
Dead Crow Reports and Location of Human West Nile Virus Cases, Chicago, 2002
During the summer and fall of 2002, an epidemic (223 cases) and epizootic of West Nile virus infections occurred in Chicago. Retrospective spatial analysis demonstrated that age-adjusted human case rates were three times higher inside geographic areas with high early-season crow deaths than outside these areas.