Coagulase-Negative Staphylococci Isolated from Various Skin Lesions

We isolated 162 coagulase-negative staphylococci (48: from infection, 114: from colonization) from various skin diseases between January, 1995, and January, 1998. From eighteen infected cysts, 10 Staphylococcus epidermidis strains, 3 S. capitis strains, 2 S. hominis strains, 2 S. auricularis strains, and one S. saprophyticus strain were individually detected. Similarly, from ten folliculitis lesions, 6 S. epidermidis strains, 2 S. capitis strains, and 2 S. hominis strains, and from five furuncle lesions, 3 S. lugdunensis strains, one S. epidermidis strains, and one S. hominis strain were detected, respectively. Four abscesses with mild inflammatory signs were localized on the scalp; S. epidermidis strains alone were detected from them. From two felons, one S. lugdunensis strain and one S. haemolyticus strain were detected, respectively. Staphylococus epidermidis and S. lugdunensis strains seems to be more frequently associated with skin suppurative lesions than other strains. Staphylococcus hominis strains and S. capitis strains were suggested to be potential pathogens in the initiation of suppuration in various purulent skin lesions. Among the 28 S. epidermidis strains, 13 (46.4%) were methicillin-resistant (oxacillin. minimum inhibitory concentration ≥4 μg/ml). Twelve (29.3%) out of the other 41 coagulase-negative staphylococci were methicillin-resisitant. Coagulase-positive and -negative staphylococci showed no differences in susceptibility tests against various antistaphylococcal agents.