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Coagulase-negative staphylococcal adherence and persistence.

Coagulase-negative staphylococci, which are normal inhabitants of human mucous membranes and skin, have recently evolved as major contributors to systemic disease in hospitalized patients in the developed world [1]. Coagulase-negative staphylococci colonizing skin are capable of adherence to plastic and other therapeutic or prosthetic devices, and therefore, intensive-care patients or patients treated with reconstructive devices are especially susceptible to serious infections with these organisms. Staphylococcus epidermidis is the coagulase-negative species most frequently recovered from clinical specimens, although ^0 species of coagulase-negative staphylococci have been identified. At least two properties of S. epidermidis provide this organism with mechanisms for persistence. One of these properties is the capacity for adherence to surfaces by using lectins or other adhesins [2]. The other property is production of a surface slime material that protects the organisms from phagocytosis and from the action of antimicrobial agents [3]. Extracellular slime substance also inhibits inflammatory and specific adaptive immune responses [4, 5].