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Published online 5 March 2004 | Nature | doi:10.1038/news040301-10

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Mosquitoes give clues to West Nile's spread

Hybrid insects may explain disease's rampant rise.

The United States harbours mosquitoes that are particularly adept at spreading West Nile virus, researchers have discovered. This may be one reason why the disease it causes has stormed across the country.

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