Merck Manual

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Professional Version

Streptogramins Use in Animals

By

Melissa A. Mercer

, DVM, MS, DACVIM-LA, Virginia Maryland College of Veterinary Medicine

Reviewed/Revised Sep 2022 | Modified Nov 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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