The deaths were not caused by an epidemic or the new H7N9 bird flu strain, and nearby chemical factories were being investigated, they added.
BBC: China pig and dog deaths prompt probe into factories
Only occasionally, as with the M strain of HIV-1, does the chatter lead to a serious epidemic.
ECONOMIST: Human malaria started in chimpanzees
The H7N9 strain has lead to the usual concerns about the virus causing a deadly influenza epidemic in China.
FORBES: Bird Flu Claims More Lives In Shanghai
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