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Infection and Immunity logoLink to Infection and Immunity
. 1975 Dec;12(6):1231–1236. doi: 10.1128/iai.12.6.1231-1236.1975

Antigenic variation of Streptococcus mutans colonizing gnotobiotic rats.

D Bratthall, R J Gibbons
PMCID: PMC415425  PMID: 1205615

Abstract

Strains of Streptococcus mutans representative of serotypes b and d exhibited antigenic variation in both the oral cavity and in the intestinal canal of gnotobiotic rats. Laboratory-maintained cultures did not vary. The antigenic alterations observed were: (i) loss of detectable levels of both weakly reacting "strain" antigens and the type antigen; (ii) decreased production of the type antigen; (ii) production of altered type antigen; and (iv) production of an antigen not possessed by the parent strain. Immunization of animals before monoinfection with S. mutans strain Bob-1 (serotype d) appeared to increase the rate of emergence of antigenically altered mutants in the intestinal canal, and more diversely altered isolates were obtained. Antigenic variation may account in part for the variation noted by several investigators in attempting to immunize animals against S. mutans-induced dental caries.

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Selected References

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