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Published online 17 November 2003 | Nature | doi:10.1038/news031110-18
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West Nile rife in Mexico
Horse sense hints some South American virus did not cross US border.
Some of the West Nile virus (WNV) circulating in Mexico may be different from that in the United States, a study has found1. The discovery suggests that WNV's spread in Central and South America and its public-health impact may be more complicated than in North America.
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