With four more human deaths in China, the death toll from H7N9 has reached 31, and 129 people have been infected since March, according to Chinese health officials. Transmission from poultry to humans has been confirmed. No evidence of human-to-human transmission exists, but 40% of infected people had no known direct exposure to poultry. According to the CDC, the current form of H7N9 will not cause a pandemic, but if it mutates, it could pose a serious global threat.
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