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. 2004 Aug;10(8):1369–1378. doi: 10.3201/eid1008.040077

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Wild bird Flavivirus seroprevalence rates (Flavi pos %) in Coachella Valley during 2003. Shown are percentages of total serum samples that tested positive each month by enzyme immunoassay. Positives include infections caused by West Nile virus and St. Louis encephalitis.