Photo: New Bird Flu Strain Spreads Fast, Is Resistant to Vaccine

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Chickens are kept in a cage in a poultry shop in Hong Kong, China, to minimize their exposure to humans.

A new, vaccine-resistant strain of bird flu has emerged in China and spread rapidly through poultry and humans in Southeast Asia, intensifying warnings of a deadly worldwide pandemic.

Photograph by Samantha Sin/AFP/Getty Images

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