Chinese authorities have killed more than 20,000 birds from a live-poultry trading zone in Shanghai after an unusual strain of bird flu was found in pigeons, state-run media Xinhua reported today.
The H7N9 virus, or bird flu, has killed six people. It had not previously been found in humans until 14 cases were reported in China this week -- all in a coastal area of eastern China.
No cases of human-to-human transmission have been confirmed so far. The Centers for Disease Control and Prevention, based in Atlanta, says its working closely with Chinese authorities to find the source of the human infections.
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