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. 1977 Apr;16(1):203–212. doi: 10.1128/iai.16.1.203-212.1977

Decreased oral colonization of Streptococcus mutans during aging of Sprague-Dawley rats.

J Van Houte, V N Upeslacis, S Edelstein
PMCID: PMC421509  PMID: 873607

Abstract

The colonization by streptomycin-resistant Streptococcus mutans strains of the teeth of conventional and ex-germfree Sprague-Dawley rats of various ages fed either a high-sucrose or a high-glucose diet was studied. Bacterial colonization occurred with increasingly greater difficulty as the rats became older. This was observed in studies of the implantation of the test organism after oral inoculation with different cell numbers as well as its transmission between infected and uninfected rats. With rat fed sucrose diet, the effect of age could not be demonstrated until they were age 3 months or older; the results from rats fed a glucose diet suggest that changes may already have occurred early after weaning. Changes in susceptibility to colonization during aging manifested themselves as a decrease in the proportions of rats which became infected as well as lower population levels in infected rats. The possible mechanism(s) involved as well as the possible significance of the findings was discussed.

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Selected References

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