AN ANAEROBIC ORAL FILAMENTOUS MICROORGANISM

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Abstract
Studies were made of the isolation, cultural conditions, and physiological characteristics of 19 strains of a gram positive filamentous micro-organism isolated from materia alba of 9 subjects. The predominant cell type was a short filament, 1.0-1.2 [mu] x 15-35 [mu], with longer filaments as well as rods and chains of rods frequently occurring. All strains were strict anaerobes. All produced indole, none reduced nitrate, liquefied gelatin, hydrolyzed starch, produced catalase, or formed acetylmethylcarbinol. Carbon dioxide was formed from glucose. All strains produced acid from fructose, glucose, galactose, mannose, lactose, maltose, sucrose, raffinose, xylose, and -methyl glucoside, but not from salicin, rhamnose, cellobiose, glycerol, dulcitol, mannitol, or sorbitol. This group of organisms appears to differ from all other previously reported forms of filamentous oral bacteria.

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