Gelbach states his claim in the context of discussing a single randomized controlled trial (ASCOT-LLA), but his broad pronouncements are carelessly framed such that others may take them to apply to a single observational study, with its greater threats to internal validity. [read post]

 E. coli O157:H7 is one of thousands of serotypes Escherichia coli.[1] The combination of letters and numbers in the name of the E. coli O157:H7 refers to the specific antigens (proteins which provoke an antibody response) found on the body and tail or flagellum[2]respectively and distinguish it from other types of E. coli.[3] Most serotypes of E. coli are harmless and live as normal flora in the intestines of healthy humans and… [read post]