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Species identification and antibiotic susceptibilities of coagulase-negative staphylococci isolated from clinical specimens.

ABSTRACT

Identification of potentially significant coagulase-negative staphylococci isolated from clinical specimens was performed along with antibiotic susceptibility determinations, S. epidermidis accounted for 75% of these isolates, with S. haemolyticus and S. hominis being the second and third most frequently encountered species, respectively. Although there were many instances of single blood culture isolations of questionable significance, all three species were also found in multiple blood cultures from individual patients, indicating the ability to cause significant bacteremia. The most common source for most species was blood, except for S. saprophyticus and S. simulans, which were found more frequently in urine. Of urinary tract isolates, however, S. epidermidis was more common than S. saprophyticus. Antibiotic susceptibility profiles demonstrated that S. haemolyticus and S. epidermidis were frequently multiply antibiotic resistant. S. haemolyticus had a higher percentage of isolates that were oxacillin, cephalothin, aminoglycoside, erythromycin, and clindamycin resistant than did S. epidermidis. We found that species identification could be of benefit for both epidemiological as well as patient care purposes, and that this additional information is readily available, using convenient and rapid new methods.

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• Skow, A., Mangold, K. A., Tajuddin, M., Huntington, A., Fritz, B., Thomson, R. B. Jr., Kaul, K. L. (2005). Species-Level Identification of Staphylococcal Isolates by Real-Time PCR and Melt Curve Analysis. J. Clin. Microbiol. 43: 2876-2880 [Abstract] [Full Text]