Number of sera tested (proportion positive for West Nile virus antibodies) in Los Angeles summarized by species and year.

Only frequently sampled birds included. A more complete listing is presented in Kwan et al. (2010b). *Included within yearly totals were 8 positives from 110 sera collected from 29 species of birds.仅纳入采样频次较高的鸟类。完整名录详见Kwan等人（2010b）的研究。 *年度统计总数中包含从29种鸟类采集的110份血清中检出的8份阳性样本。