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The Journal of Medical Microbiology, Vol 29, Issue 3 229-235, Copyright © 1989 by Society for General Microbiology

JOURNAL ARTICLE

Gardnerella vaginalis has a gram-positive cell-wall ultrastructure and lacks classical cell-wall lipopolysaccharide

K. Sadhu, P. A. Domingue, A. W. Chow, J. Nelligan, N. Cheng and J. W. Costerton
Department of Biological Sciences, University of Calgary, Alberta, Canada.

Gardnerella vaginalis has a very thin cell wall with a characteristic gram-negative staining pattern and an apparent lamellar structure when viewed at an oblique angle by electronmicroscopy. Examination at right angles to the cell-wall plane and by freeze-etching showed absence of an outer membrane or any other lamellar structure. Cell-wall extracts made by methods specific for lipopolysaccharide (LPS) gave negative reactions by silver staining and for endotoxin in the limulus amoebocyte lysate assay. 2-Keto-3-deoxy-D-manno-2-octonoic acid (KDO), heptose and hydroxy fatty acids specific for LPS were not detected in the extracts. G. vaginalis cell walls are unequivocally gram-positive in their ultrastructural characteristics and chemical composition.


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