The dental plaques of 20 young children were examined for bacteria having lytic activity against Streptococcus sanguis ATCC 10556, 10557, and 10558. Bacteria showing lytic activity against S. sanguis ATCC 10558 alone were isolated from dental plaques of all subjects. They were identified as Streptococcus mutansby their physiological characteristics and produced an extracellular enzyme that dissolved living cells of S. sanguis ATCC 10558, but not those of S. sanguis ATCC 10556 and 10557, Streptococcus salivarius ATCC 9222 and HHT, Streptococcus mitis ATCC 9811, Streptococcus milieu ATCC 10708, or Streptococcus mitior ATCC 903. However, this enzyme dissolved living cells of 43 (32.8%) out of 131 strains of S. sanguis isolated from dental plaques of all subjects at a rate similar to or higher than that against S. sanguis ATCC 10558 cells.

Keywords:
Lytic bacteria, Lytic enzymes, Plaque, Streptococcus mutans, Streptococcus sanguis
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© 1987 S. Karger AG, Basel
1987
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