The pigs appear to be infected with porcine circovirus, a virus affecting pigs. It seem likely that the pigs were dumped once found to be contaminated. They were first found in the Huangpu River about 40 miles north of Shanghai. Tags on their ears trace them to the city of Jiaxing in Zhejiang province which is known for pig raising. However, Jiaxing city government officials denied responsibility for the dead pigs and said that the tags may only show where they were born.
The government has tried blaming farmers in Jiaxing but this seems more likely the result of a large factory operation. Farmers routinely throw tainted animals in the river and there are reports of the dead animals being pulled from the river and used for food in China.
Source: ABC
