The fast food giant is seeking compensation of 1.5 million yuan ($242,000) and an apology.
One of the posts said chickens used by KFC were genetically modified to have six wings and eight legs.
A case has now been filed before a court in Shanghai.
KFC says the rumors appeared in posts on the WeChat app.
The company said in a statement that the rumors had spread through at least 4,000 subsequent posts.
KFC China’s president Qu Cuirong said: “This not only seriously misled consumers, but also hurt our brand.”
The fast food giant named the original posters as Shanxi Weilukuang Technology Company Ltd, Taiyuan Zero Point Technology Company and Yingchenanzhi Success and Culture Communication Ltd.
The companies have not commented on the court complaint.
At least 158 people have died in Spain's worst flooding disaster in generations. On October…
Google has been fined two undecillion (a two followed by 36 zeroes) roubles by a…
Embarking on a home remodel is an exciting journey, promising enhanced comfort, increased property value,…
The US presidential candidates continued to campaign across key swing states on October 20. Footage…
Elon Musk has said he will give away $1 million a day to a registered…
India and Canada have decided to expel their top envoys along with other diplomats as…
