They were all hospitalized for stomach aches and diarrhoea. Three people remained in the hospital for further observation, said Wang Guobin, an official with the Guangzhou Municipal Public Health Bureau.
Wang said all of them had eaten pig organs, which, according to an initial investigation, were contaminated by
Clenbuterol, a feed additive.
The chemical, dubbed "shouroujing" which literally means "lean meat essences for pigs" in Chinese, can prevent pigs from accumulating fat, but is poisonous to humans and can be fatal.
It is banned as an additive in pig feed in China and in most other countries of the world.
Wang said a further investigation is underway to find out the source of the additive.