Johns Hopkins ABX Guide
Peptostreptococcus spp. (and Finegoldia magna)
MICROBIOLOGY
- Anaerobic Gram-positive cocci: part of the normal flora of the mouth, GI and GU tracts as well as skin.
- A heterogeneous group of "anaerobic streptococci" now classified into 5 groups and changes in the taxonomy that 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.
- Note: microaerophilic streptococci such as Streptococcus intermedius Group are pathogenic, often important in mixed infections. They are not Peptostreptococci and are not sensitive to metronidazole.
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Last updated: September 5, 2020
Citation
Auwaerter, Paul G. "Peptostreptococcus Spp. (and Finegoldia Magna)." Johns Hopkins ABX Guide, The Johns Hopkins University, 2020. Pediatrics Central, peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540426/all/Peptostreptococcus_spp___and_Finegoldia_magna_.
Auwaerter PG. Peptostreptococcus spp. (and Finegoldia magna). Johns Hopkins ABX Guide. The Johns Hopkins University; 2020. https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540426/all/Peptostreptococcus_spp___and_Finegoldia_magna_. Accessed December 1, 2023.
Auwaerter, P. G. (2020). Peptostreptococcus spp. (and Finegoldia magna). In Johns Hopkins ABX Guide. The Johns Hopkins University. https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540426/all/Peptostreptococcus_spp___and_Finegoldia_magna_
Auwaerter PG. Peptostreptococcus Spp. (and Finegoldia Magna) [Internet]. In: Johns Hopkins ABX Guide. The Johns Hopkins University; 2020. [cited 2023 December 01]. Available from: https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540426/all/Peptostreptococcus_spp___and_Finegoldia_magna_.
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