Miyarisan is a commercial Japanese probiotic clostridium butyricum. It is often used to treat C. Difficile, Candida albicans, enterotoxigenic Escherichia coli, Klebsiella spp.*, Salmonella spp.* and Vibrio spp* intestinal infections. It is named after Dr. Miyairi who discovered it in 1933 at the department of Hygiene at Chiba Medical College (now located at the Chiba University School of Medicine), Japan.
(*ssp in used when it applies to many species within a genus but not the entire genus)