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An ultrastructural study of adherence to buccal epithelial cells of Simonsiella sp.

Simonsiella, an unusual aerobic Gram‐negative multicellular, filamentous bacterium present in the oral flora, possesses a marked dorsal‐ventral differentiation. The morphology and ultrastructure of the structural appendages on the ventral surface were examined. Two types of fibrils could be distinguished; in vitro adherence of Simonsiella to buccal epithelial cells was by means of the short fibrils.