S. boulardii is recommended to fight Clostridium difficile, and I am afraid other species under the Clostridium genus might also be sensitive to it.
Clostridium butyricum (Wikipedia)
Its usefulness stems primarily from its ability to interfere with the growth of highly pathogenic Clostridium difficile by antagonizing its multiplication.[3] It is often used in Japanese hospitals for C. difficile prophylaxis amongst in-patients and, particularly, during administration of certain powerful antibiotics (i.e.: Levofloxacin) associated with opportunistic C. difficile infection.
Its usefulness stems primarily from its ability to interfere with the growth of highly pathogenic Clostridium difficile by antagonizing its multiplication.[3] It is often used in Japanese hospitals for C. difficile prophylaxis amongst in-patients and, particularly, during administration of certain powerful antibiotics (i.e.: Levofloxacin) associated with opportunistic C. difficile infection.