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        Adhesion of Yeast and Bacteria to Oral Surfaces

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        Colonization of surfaces in the human body by microorganisms is an early, essential, step in the initiation of infectious disease. We have developed in vitro assays to investigate interactions between yeast or bacterial cells and human tissues, fluids, or prostheses. Such assays can be used to identify the adhesins, ligands, and receptors involved in these interactions, for example by determining which components of the microbe or human tissue/fluid interfere with adherence in the assay. The assays can also be applied to finding ways of preventing adhesion, and subsequent disease, by investigating the effects of different conditions and added compounds on adherence in the in vitro assays. We describe six assays for measuring adhesion of the oral yeast Candida albicans , a common commensal and opportunistic pathogen, or the bacterium Staphylococcus epidermidis , which is not normally pathogenic but is known to form biofilms on medical prostheses. The assays described represent two approaches to investigating adhesion; retention at a fixed time point following liquid washes; and retention against a continuous flow of medium.
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