Morphology and ultrastructure of oral strains of Actinobacillus actinomycetemcomitans and Haemophilus aphrophilus

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Abstract
Selected human oral and nonoral strains of the genera Actinobacillus and Haemophilus were examined by transmission and scanning electron microscopy. The strains examined were morphologically identical to recognized A. actinomycetemcomitans, H. aphrophilus and H. paraphrophilus. By transmission electron microscopy, the cells were typically gram negative in morphology, with several strains possessing some extracellular ruthenium red-staining polymeric material. Numerous vesicular structures, morphologically identical to lipopolysaccharide vesicles, originated from and were continuous with the surface of the outer membrane. Large numbers of these vesicles were found in the external environment. Scanning electron microscopic observations revealed that actinobacilli and haemophili possessed surface projections and an amorphous surface material which connected and covered adjacent cells.

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