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Health workers collect blood samples from chickens at a poultry farm on April 17, 2013 in Taizhou, China.
Health workers collect blood samples from chickens at a poultry farm on April 17, 2013 in Taizhou, China.

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    What is bird flu?

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What is bird flu?

Avian influenza usually only affects birds, but it's caused thousands of life-threatening infections in humans too.

What is bird flu?

Avian influenza usually only affects birds, but it's caused thousands of life-threatening infections in humans too.