Streptococcus sanguis, Streptococcus mitis, Actinomyces viscosus, Actinomyces naeslundii, Peptostreptococcus micros, Fusobacterium nucleatum, Prevotella intermedia, and Campylobacter rectus

-May-

Infected clenched fist injuries usually contain several disease-causing bacteria, the most common being Streptococcus pyogenes, Staphylococcus aureus, Bacteroides sp., Peptostreptococcus sp., and Eikenella corrodens.

The human intestines are filled with what is known as gut flora. Gut flora is microbia found in the digestive tract that consists of Bacteroides, Clostridium, Fusobacterium, Eubacterium, Ruminococcus, Peptococcus, Peptostreptococcus, and Bifidobacterium.

The normal microbiota of gut are non-pathogenic and are
Enterococcus faecalis, lactobacillli Peptostreptococcus, yeasts, but gut alos contain some pathogenic bacteria but in very less no. i.e. less then 10 viable cells which are non effective like Streptococcus, Staphylococcus, Candida albicansetc.

A wide range of bacterial species in the gut are present there as friendly commensals. About a third of all bacteria in the gut are members of the Bacteroides species. Other species that are represented include Lactobacillus, the bacteria commonly used in probiotic foods such as live yogurt, Escherichia species, such as E. coli, some Clostridium bacteria, the Fusobacteria, the Eubacteria, members of the Bifidobacteria group and lesser known species such as Peptostreptococcus, Ruminococcus and Peptococcus.