National chain Jimmy John’s and a Marion-based wholesale food service distributor last week were issued letters from the U.S. Food and Drug Administration, over a reported link between their vegetables and multiple cases of E. coli.According to the FDA’s letter, the Champaign, Ill.-based sandwich chain “engaged in a pattern of receiving and offering for sale adulterated fresh produce, specifically clover sprouts and cucumbers,” resulting in five outbreaks of E.