Authorities in Shanghai began the mass slaughter of poultry at a market after the H7N9 bird flu virus, which has killed five people in China, was detected there, state media reported today.

The new strain of the bird flu virus was detected in samples of pigeon, sparking the closure of the market, Xinhua news agency reported.

The cull started as experts were attempting to determine how the strain came to infect humans.

(This article was published on April 5, 2013)
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