The Yeasts of the Normal Mouth and Their Relation to Salivary Acidity

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Abstract
Yeasts were cultivated from the salivas of 48.6% of 584 healthy college students. Of the yeast-positive group, 79% were still positive after 2 months. The numbers of yeasts ranged from 10 to 10,000 per ml. of saliva, the majority of specimens showing counts of 1000 or less. Candida albicans was identified in 93.8% of the cultures; 5 other spp. of Candida were also found, and 2 of Cryptococcus. All subjects were classified, according to salivary acidity, at one-half pH units from 5 to 7.5. Yeasts were isolated from some salivas at all pH levels, but the incidence was considerably higher in the more acid salivas. A direct relation was shown between the incidence of C. albicans and the degree of salivary acidity.

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