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Streptogramins Use in Animals

ByMelissa A. Mercer, DVM, MS, DACVIM-LA
Reviewed/Revised Sept 2022

    The streptogramin antimicrobials include two distinct groups: Group A, a 23-member unsaturated ring with lactone and peptide bonds, and group B, the depsipeptides (lactone-cyclized peptides). These antimicrobials are included in the macrolide-lincosamide-streptogramin (MLS) group. However, whereas the individual A and B components act in a bacteriostatic fashion when used as sole agents, together the affinity for the ribosome is enhanced, causing them to be bactericidal. Streptogramins include virginiamycin. Streptogramins are used to treat vancomycin-resistant staphylococci and Enterococcus faecium.

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