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Nature 435, 542-543 (2 June 2005) | doi:10.1038/435542a; Published online 1 June 2005

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Flu in wild birds sparks fears of mutating virus

David Cyranoski

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Experts pressure China for samples that can be analysed.

The deaths in China of more than 1,000 migratory birds from the flu strain H5N1 has left experts struggling to square the outbreak with their knowledge of the virus. At the same time, rumours are beginning to circulate that humans in the region have also fallen victim to the disease — although official sources have so far denied this.