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  • Title: [Antagonism between oral cavity streptococci and staphylococci].
    Author: Krzemiński Z, Raczyńska A.
    Journal: Med Dosw Mikrobiol; 1993; 45(1):33-6. PubMed ID: 8231439.
    Abstract:
    The subject of this study was investigation of quantitative relations between streptococci, lactic acid bacilli and actinomycetes and staphylococci present in the oral cavity. It was found that in each tested sample of saliva streptococci are present which inhibit growth of an indicator strain Staphylococcus aureus 209P. Percentage of such streptococci varies from 11.1% to 100% (mean value 52.9 +/- 19.7%). There is a negative correlation between number of streptococci and staphylococci in samples of saliva delivered from the same oral cavity. Pearson's linear correlation coefficient was r = -0.7962 (p < 0.0001), and Spearman's correlation rank was rs = -0.7667 (p < 0.0001). Lactic acid bacilli were inhibiting growth of staphylococci only in conditions in which there were not neutralized by organic acids produced by these microorganisms. Actinomycetes had no influence at all on growth of these microorganisms. These results suggest that streptococci are responsible for antagonistic properties of oral cavity bacterial flora in relation to staphylococci. Numbers of streptococci conditions size of staphylococcal population in this environment. Staphylococci practically exert no antagonistic activity against cohabiting with them streptococci.
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