Purity >98%. Fusidic acid is a steroidal antibiotic produced by F. conccineum that inhibits the translocation function of the elongation factor EF-G (IC50 = ~10-200 μM) during bacterial protein synthesis. Fusidic acid is typically used to inhibit the replication of gram-positive bacteria including Staphylococcus, Streptococcus, and Corynebacterium species.