It contains three antibiotics&colon; neomycin, polymyxin B, and bacitracin. Some important antibiotics besides penicillin are cephalosporins, azythromycin, bacitracin, gentamycin, rifamycin, streptomycin, tetracycline, and vancomycin. The use of neomycin/polymyxin B/bacitracin, decreases infection rates in minor-contaminated wounds. Other popular recommendations include triple dye, betadine, bacitracin, or silver sulfadiazine. Bacitracin is also commonly used as an aftercare antibiotic on tattoos and circumcision. The enzyme has been implicated in conferring resistance to the antibiotic bacitracin. Several antibiotics, e.g. bacitracin, contain D-amino acid residues. Bacitracin is a narrow-spectrum antibiotic. Most "Streptococcus milleri" strains are resistant to bacitracin and nitrofurazone, and sulfonamides are totally ineffective. "Kocuria" is susceptibility towards bacitracin and lysozyme and resistance to nitrofurantoin, furazolidone and lysostaphin. To confirm it is not "Staphylococcus aureus," a bacitracin susceptibility test can be performed. Species in this genus are resistant to bacitracin and lysozyme and sensitive to furazolidone. Bacitracin is composed of a mixture of related compounds with varying degrees of antibacterial activity. Chocolate agar with the addition of bacitracin becomes selective for the genus "Haemophilus". Bacitracin was approved by FDA in 1948.