Volume 10, Number 6—June 2004
Dispatch
Antibody Prevalence of West Nile Virus in Birds, Illinois, 2002
Figure 2

Figure 2. Monthly percentage of West Nile virus antibody–positive birds in Illinois during 2002, with corresponding sample size. First human, mosquito, and equine cases for Illinois are reported for comparison. Bars show the monthly sample size and lines indicate the monthly seroprevalence.
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