Ferguson and Henderson (1947) described the isolation of a motile coliform organism possessing the major somatic antigen of Shigella sonnei, form I, from the feces of a patient whose clinical history was not available. They called the organism strain C27. It was also found in man and animals by Wheeler (1947), van de Pitt (1953), and Schmid, Velaudapilli and Niles (1954). Recently, similar orga...