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Summary of house finch and house sparrow seroprevalence in Los Angeles County during 2004–2008 (number positive/total collected/month) compared with the counts of human cases and positive dead birds by monthly interval. Positive dead birds indicates virus detection in bird carcasses by reverse transcription–polymerase chain reaction and seroprevalence indicates detection of antibody to West Nile virus by enzyme immunoassay in live-captured house finches and house sparrows.
