Restaurant's lettuce wasn't the source of a St. Louis E. coli outbreak, officials say KSDK.comLettuce tests negative in St. Louis County E. coli outbreak KTVI Fox 2 St. LouisAt least 106 sick, 2 hospitalized by E. coli outbreak linked to St. Louis caterer for school events, funerals CBS NewsMissouri Health Department releases results of lettuce taken as part of investigation into E.