In the summer of 1999, two strange seemingly unrelated events in New York City were reported in the news ("Anatomy of an Outbreak," 1999). In the hospital, aging patients with an unknown cause were confused, feverish, and weak to the point of paralysis. At the Bronx Zoo, crows were hobbling around shaky and disoriented and dying in record numbers. After several false starts, researchers were able to link the strange afflictions--both human and avian--to the West Nile virus (WNV).

Recognizing the importance of monitoring avian death rates, a surveillance system was quickly set up to track spread of West Nile virus in the eastern and southern United States. Surveillance ...

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