Abstract
Cross-inhibition within the group of black-pigmented Bacteroides, including both oral and non-oral strains, was studied by means of a membrane filter technique. It was found that B. gingivalis possessed the most extended inhibitory capacity among all species tested. B. gingivalis showed inhibitory activity against B. intermedius, B. endodontalis, B. loescheii, and B. melaninogenicus. B. endodontalis was active against some B. intermedius strains. Among the saccharolytic species, some B. melaninogenicus strains were inhibitory for some B. endodontalis strains, some B. gingivalis strains, and some B. intermedius strains. These inhibitory activities observed in vitro may play a role in the colonization of the periodontal pocket.
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