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West Nile Virus Leaves Forecasters Puzzled

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West Nile Virus Leaves Forecasters Puzzled

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West Nile Virus Leaves Forecasters Puzzled

West Nile Virus Leaves Forecasters Puzzled

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  • <iframe src="https://www.npr.org/player/embed/4224001/4224002" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

Scientists are having a hard time producing an accurate prediction of the impact of the West Nile virus. Epidemic outbreaks were forecast for California in 2004, but failed to materialize. NPR's John Nielsen reports.