Observations on the ecology of streptococci in the human mouth
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Patterns of bacteriocin production and sensitivity have been found to be highly specific for individual types of the same bacterial species. To determine if plaque samples normally harbored more than one type of Streptococcus mutans, and Streptococcus sanguis, 6-10 isolates of Strep.mu1ans and Strep.sanguis were obtained from 8 samples of human plaque present on sound enamel surfaces in 4 individuals. On the basis of their patterns of bacteriocin production and sensitivity, it was found that the isolates of Strep.mutans per plaque sample represented from 6 to 8 types. The isolates of Strep.sanguis represented from 4 to 6 types. The colonization of a single site by multiple types occurred with other species of streptococci, for it was found that the population of Streptococcus sa I ivarius on a given site on the tongue comprised from l to 8 types per l O isolates from 20 samples examined. In 8 of the 10 individuals studied, the same strain of Strep.salivarius was isolated from different parts of the same tongue surface. In two sets of twins studied 2 identical strains per set of twins were found to be present on the tongue surface.
PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please click Download and log in with a valid BU account to access. If you are the author of this work and would like to make it publicly available, please contact firstname.lastname@example.org.Thesis (M.Sc.D.)--Boston University, School of Graduate Dentistry, 1970 (Periodontology)Includes bibliography (leaves 34-39)
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