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Articles on Avian flu strains

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Although H5N1 typically infects wild birds, the virus has spilled over into domesticated animal populations, like dairy cows. Peter Cade/Stone via Getty Images

Avian flu has infected dairy cows in more than a dozen states – a microbiologist explains how the virus is spreading

The H5N1 virus has infected about 900 people since 2003, and more than half of them died. But so far there is no evidence of human-to-human transmission.

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