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Department of Otolaryngology, University of Tromsø, Norway.
Bacterial adherence to the oropharyngeal epithelium is a significant factor in normal microecology, etiopathogenesis of diseases (tonsillitis, gingivitis) and possibly also induction of immune response. Bacterial adhesion to human tonsillar epithelium of whole tonsils and swabs was studied by fluorescence, scanning, and transmission electron microscopy. The epithelial cell borders were well demarcated. On the apical surface of the cells there were irregular microridges. All forms of microscopy visualized epithelial cells with attached bacteria, often forming microcolonies on the free surface. Some bacteria formed excavations on the cell surface. Most attached bacteria were coccoid, but variously sized rods were also visible. In transmission electron microscopy, epithelial cells with intracellular bacteria were regularly observed.
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