A health worker lowers dead pigs into a processing pit at a hog farm in Zhuji city.  In the past two weeks, more than 16,000 pig carcasses have been pulled from the river system that feeds into Shanghai. (Associated Press)

A health worker lowers dead pigs into a processing pit at a hog farm in Zhuji city. In the past two weeks, more than 16,000 pig carcasses have been pulled from the river system that feeds into Shanghai. (Associated Press)