Recommendations for diagnosis of shiga toxin--producing Escherichia coli infections by clinical laboratories. - Gould LH; Bopp C; Strockbine N; Atkinson R; Baselski V; Body B; Carey R; Crandall C; Hurd S; Kaplan R; Neill M; Shea S; et al. (MMWR. Recommendations and reports : Morbidity and mortality weekly report. Recommendations and reports, 2009)