Identification, Shiga toxin subtypes and prevalence of minor serogroups of Shiga toxin-producing Escherichia coli in feedlot cattle feces oleh Kaylen M. Capps, Justin B. Ludwig, Pragathi B. Shridhar, Xiaorong Shi, Elisabeth Roberts, Chitrita DebRoy, Natalia Cernicchiaro, Randall K. Phebus, Jianfa Bai, T. G. Nagaraja