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Peptostreptococcus is a topic covered in the Johns Hopkins ABX Guide.

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  • Anaerobic Gram-positive cocci: part of normal flora of the mouth, GI and GU tracts as well as 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 cocci, may be seen on Gram stain in short chains and pairs.
    • GPC seen may appear identical to aerobic streptococci (chains) or staphylococci (clusters) [Fig].
    • Non-spore forming
  • Peptostreptococcus (which includes the former 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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Last updated: July 2, 2016


Auwaerter, Paul G, and John G Bartlett. "Peptostreptococcus." Johns Hopkins ABX Guide, The Johns Hopkins University, 2016. Pediatrics Central, peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540426/all/Peptostreptococcus.
Auwaerter PG, Bartlett JG. Peptostreptococcus. Johns Hopkins ABX Guide. The Johns Hopkins University; 2016. https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540426/all/Peptostreptococcus. Accessed June 25, 2019.
Auwaerter, P. G., & Bartlett, J. G. (2016). Peptostreptococcus. In Johns Hopkins ABX Guide. Available from https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540426/all/Peptostreptococcus
Auwaerter PG, Bartlett JG. Peptostreptococcus [Internet]. In: Johns Hopkins ABX Guide. The Johns Hopkins University; 2016. [cited 2019 June 25]. Available from: https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540426/all/Peptostreptococcus.
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TY - ELEC T1 - Peptostreptococcus ID - 540426 A1 - Auwaerter,Paul,M.D. AU - Bartlett,John,M.D. Y1 - 2016/07/02/ BT - Johns Hopkins ABX Guide UR - https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540426/all/Peptostreptococcus PB - The Johns Hopkins University DB - Pediatrics Central DP - Unbound Medicine ER -