Abstract
Twelve strains having similar morphological and cultural characteristics were isolated from dental caries. They are strictly anaerobic and grow best on blood agar. Though utilizing carbohydrates to produce acid, their status as an etiological factor in dental caries is doubtful. They differ from the Leptothrix isolated by Vignal in that his organism grew well aerobically on ordinary laboratory media. The pleomorphism of this organism is very likely responsbile for differences of opinion advanced by early workers.

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