For isolation of Clostridium difficile. Clostridium Difficile Agar is a formula recommended by George et al. for isolation of C. difficile. The medium contains fructose which enhances the recovery and growth of C. difficile. The addition of the antibiotics, cefoxitin and cycloserine, inhibit the growth of Enterobacteriaceae, Enterococcus faecalis, Staphylococci, Gram negative non-sporulating anaerobic bacilli, and Clostridia sp. but not C. difficile. Supplementing the medium with horse blood and egg yolk further improves the recovery of C. difficile.