| Peptostreptococcus micros | A species found in natural cavities of humans and other animals; it has been isolated from various pathologic conditions. (05 Mar 2000) |
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| Peptostreptococcus morbillorum | A species found in the nose, throat, eyes, ears, mucous secretions, and blood in cases of measles, being irrelevant, however, to the aetiology of measles; probably present normally, developing as a secondary invader. (05 Mar 2000) |
| Peptostreptococcus paleopneumoniae | A species found in the buccal pharyngeal cavity and the upper respiratory tract of humans. (05 Mar 2000) |
| Peptostreptococcus parvulus | A species isolated from the mouth and the respiratory tract. (05 Mar 2000) |
| Peptostreptococcus plagarumbelli | A species commonly found in septic war wounds. (05 Mar 2000) |
| Peptostreptococcus productus | A species found in natural cavities of humans, especially respiratory cavities. (05 Mar 2000) |
| Peptostreptococcus putridus | A species found in the human mouth and intestinal tract but especially in the human vagina. (05 Mar 2000) |