Observations on the ecology of streptococci in the human mouth
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Abstract
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.
Description
Thesis (M.Sc.D.)--Boston University, School of Graduate Dentistry, 1970 (Periodontology)
Includes bibliography (leaves 34-39)
Includes bibliography (leaves 34-39)
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This work is being made available in OpenBU by permission of its author, and is available for research purposes only. All rights are reserved to the author.