<p>E. coli is not generally harmful, it is a normal part of the gut microbiota. The specific strain or serotype called E. coli O157:H7 is pathogenic and is the cause of these incidents.</p>
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<p>I think a law suit is ethical under the legal doctrine that prevails where the incident occurred. In this case, the principle is strict liability, the restaurant did you harm so it should pay.</p>
<p>There is no recourse to blaming bad luck in food safety management. The presence of E. coli O157:H7 comes from fecal contamination, often from cattle manure coming in contact with irrigation water. The producers are responsible for avoiding the contamination, and the sellers are responsible for buying from reliable producers.</p>
<p>If the restaurant thinks it can’t operate a safe salad bar, it should close it.</p>