For updated information see Microbiome Prescription
There are 690+ studies on PubMed
- “These included (increaased) Aggregatibacter (OTU id 4335776), Aggregatibacter segnis (A. segnis), Campylobacter, Capnocytophaga, Clostridiales, Dialister, Leptotrichia, Parvimonas, Peptostreptococcus, Peptococcus, Prevotella, Selenomonas, SR1, Tannerella, TM7-3 and Treponema in the Intra-oral halitosis group. ” 
- Infection of the foot with Peptococcus magnus .
- “Mixed Peptococcus magnus infections involved the following sites: bone and joint (32 cases), soft tissue (57 cases), foot ulcers (29 cases), abdominal cavity (16 cases), and miscellaneous (17 cases).” 
- “At the genus level, Peptococcuswere decreased in the cinnamon bark group.” 
- Gallate (tea)