Is it safe to use vegetables (e.g. Romaine lettuce) that may be contaminated with E. coli if they are fully cooked?
From what I have read, some strains of E. Coli are heat-resistant, so it's not a good idea to think that cooking it will kill the bacteria if present. Also, you might contaminate your cooking utensils or other surfaces that do not encounter the heat. It's safest to just get rid of it.