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. 2007 Apr;13(4):651–653. doi: 10.3201/eid1304.061383

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Collection sites for West Nile virus (WNV) in Venezuela. Symbols represent results of tests for specific antibodies to WNV in serum samples of birds and horses (viral titers in a 90% plaque reduction neutralization test >40 and a 4-fold differential inhibition in a neutralization assay to WNV compared with other related flaviviruses). Source: Instituto Geográfico de Venezuela Simón Bolivar, Caracas, Venezuela.