(AP) — A Texas mother and son who say they were sickened at a Lincoln restaurant have filed a lawsuit against the company that owns Olive Garden restaurants in a Nebraska court.

Houston-based law firm Simon & Luke issued a news release Saturday saying it had filed the lawsuit in Lancaster County District Court on behalf of Laurenda Sanguinetti and her son, Richard Sanguinetti, both of Midlothian, Texas. The pair are suing Orlando-based Darden Restaurants, which owns both Olive Garden and Red Lobster restaurants.

The Food and Drug Administration has blamed an outbreak of severe stomach illnesses in Iowa and Nebraska on salad served at the restaurants.

The Sanguinettis say they were among hundreds sickened by the rare parasite cyclospora when they ate at an Olive Garden restaurant in Lincoln.