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Journal of Dental Research, Vol 56, 166-176, Copyright © 1977 by International & American Associations for Dental Research Online Journals

ARTICLES

Microcapsules on Streptococcus mutans serotypes by electron microscopy

E. M. Grenier, R. H. Gray, W. J. Loesche and W. C. Eveland

Extracellular microcapsules have been demonstrated on cells of most serotypes of Streptococcus mutans by electron microscopy, using bacterial strains of the various serotypes and peroxidase labeled or unlabeled immune serum. A correlation was noted between the amount of capsular substance on the strains of S mutans examined and degree of antigenicity as expressed by the indirect fluorescent antibody (FA) title. A serotype d strain was shown to lose both antigenicity as determined by the FA reaction and capsular material as seen by electron microscopy with repeated in vitro passage. When 10% unheated rabbit serum was added to the medium, antigenicity and capsular material were restored.




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