WATERLOO, Wis. -

The president of an award-winning cheese company in Wisconsin said the source of contamination that led to the death of a Minnesota man and sickened four others is still uncertain.

George Crave said production and distribution of the three recalled cheeses linked to the illnesses has ceased. The U.S. Food and Drug Administration and state agriculture officials have inspected Crave Brothers Farmstead Cheese Co., near Waterloo.

All five people sickened by listeria were diagnosed between May 20 and June 17. The FDA said they range in age from 31 to 67 years old. Minnesota health officials say one of the state's two victims died.

The Journal Sentinel said the products involved, Les Frères cheese, Petit Frère cheese, and Petit Frère with Truffles, have previously won awards from the American Cheese Society.