If news reports can be relied upon, it seems that China's food chain is not only at risk, but that it is likely that things will get a lot worse before they get better:
China's food chain now at risk | The Australian
About 18 months ago a colleague of mine gave me an article about contaminated products (including food) coming out of China. I took little notice of it at the time, but it seems that this problem has been a time bomb just waiting to go off.