Streptogramins are a class of antibiotics. Streptogramins are effective in the treatment of vancomycin-resistant Staphylococcus aureus (VRSA) and vancomycin-resistant Enterococcus (VRE), two of the most rapidly growing strains of multidrug-resistant bacteria. They fall into two groups: streptogramin A and streptogramin B. Members include: Quinupristin/dalfopristin Pristinamycin Virginiamycin NXL 103, an experimental streptogramin in clinical trials for the treatment of respiratory tract infections. References Antibiotics