The issue with lettuce and salads from fast food is the risk of cross contamination because the the people working in them don't wash their hands often enough, do not follow the procedures they should, or wear plastic gloves while preparing food. Cross contamination occurs more often when preperation staff wear plastic gloves as they cannot feel when their hands are dirty, and also fall into the false belief that plastic gloves are cleaner and safer than their bare hands, which is false. They aren't changed often enough and by extension, the contamination occurs.
HTH clear up some confusion.
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