Ultrastructures of Bacteroides gracilis, Campylobacter concisus, Wolinella recta, and Eikenella corrodens, All from Humans with Periodontal Disease

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Abstract
Using transmission electron microscopy, the ultrastructures of 13 isolates and 2 reference strains of E. corrodens, 6 isolates of B. gracilis, 6 isolates of W. recta, 5 isolates of C. concisus, 2 reference strains of B. ureolyticus, 2 reference strains of C. fetus, 2 reference strains of C. sputorum and 1 reference strain (VPI 9584) that was originally identified as Vibrio succinogenes were examined. All E. corrodens strains were nonflagellated rods that were ultrastructurally distinct from another group of nonflagellated rod-shaped bacteria (B. gracilis and B. ureolyticus). The cells of W. recta strains were short rods, each having a single polar flagellum and a characteristic outer membrane covered with a distinctive array of hexagonally packed macromolecular subunits. C. concisus, C. fetus, C. sputorum and strain VPI 9584 formed a heterogeneous group of monoflagellated rod-shaped bacteria. All of the strains examined had cell wall structures compatible with the structures of gram-negative microorganisms. The morphological distinctions among species appeared to be helpful in the identification of similar isolates.