B. endodontalis, n a strain of B. melaninogenicus associated with papal infections.
B. forsythus, n a recently identified anaerobic gram-negative species of Bacteroides found in periodontal pockets.
B. fragilis, n the most common and virulent strain of a genus of obligate anerobic bacilli normally found in the mouth, upper respiratory system, colon, and genital tract.
B. gingivalis, n a strain of B. melaninogenicus associated with acute periodontitis.
B. intermedius, n a strain of B. melaninogenicus associated with acute necrotizing ulcerative gingivitis.
B. melaninogenicus, n a small, gram-negative diplobacillus, also known as Bacterium melaninogenicum, found in the mouth and pharynx.
