Money Fast-food biz’s bottom line likely unaffected by E. coli romaine lettuce outbreak: Experts November 29, 2018November 29, 2018Zlati Meyer, USA TODAYComments Off on Fast-food biz’s bottom line likely unaffected by E. coli romaine lettuce outbreak: Experts Salads are a small part of fast-food chains' sales, and many don't even use romaine lettuce.