Oct 29 (Reuters) - McDonald's was sued on

Tuesday by consumers in a proposed class action stemming from

the E.coli outbreak linked to onions in the fast-food chain's

Quarter Pounders.

In a complaint filed in Chicago federal court, Amanda McCray

and William Michael Kraft said they experienced many symptoms

associated with E.coli infection after buying Quarter Pounders

this month. They said they would not have bought their burgers

had McDonald's disclosed the risk of contamination.

The lawsuit seeks damages for all people in the United

States who bought Quarter Pounders contaminated with E.coli.