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The existence of gram negative asaccharolytic rod-shaped bacteria in the human oral cavity has been reported by a number of investigators. However, the data on motile anaerobic bacteria are considered to be less numerous. Van Palenstein Heldermanl) isolated hydrogen dependent organisms resembling Vibrio succinogenes which had been previously reported by Wolin et al.2) Recently, Tanner et al. isolated anerobic gram negative asaccharolytic bacteria with a polar flagellum from the human dental plaque and proposed a new genus Wolinella31. We also isolated strict anaerobic gram negative, motile, asaccharolytic rods from the human gingival crevice area. They were similar, in some biochemical characters, to the organisms reported by Van Palenstein Helderman and Rosman and Wolinella, but were distinct from them, especially in their morphological characters. In this communication, the morphology and some biochemical characteristics of the newly isolated organisms are reported and discussed. Fourteen strains of bacteria were isolated from the clinical healthy gingival crevice of man in a modified CBRCA medium described by Van Palensterin and Winkler4) in an anaerobic glove box (Anaerobox, Hirasawa, Tokyo) under a gaseous atmosphere of N2:H2: CO2 = 80:10: 10. They were purified in a RCA medium (Oxoid), and maintained in the RCA medium or in a BHI agar medium (Difco). The morphological characteristics of the

Strict anaerobic organisms resembling Wolinella isolated from human gingival crevice.