Johns Hopkins Antibiotic (ABX) Guide

Peptostreptococcus/Peptococcus

MICROBIOLOGY

  • Anaerobic gram positive cocci: part of normal flora of the mouth, GI tract, genital tract and skin.
  • Heterogeneous group of "anaerobic strep" now classified in 5 groups and changes in taxonomy can be confusing. For example, Finegoldia magna is the former Peptosteptococcus magnus.
  • Small, may be seen on Gram stain in short chains and pairs.
    • GPC seen may appear identical to aerobic streptococci (chains) or staphylococci (clusters).
  • Peptostreptococcus and Peptococcus account for nearly all anaerobic GPC except Finegoldia magna.
  • Most common and important: Finegoldia magna, P. asaccharolyticus. Less common: P. micros, P. anaerobius.

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