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J Med Microbiol 56 (2007), 1346-1349; DOI: 10.1099/jmm.0.47235-0
© 2007 Society for General Microbiology
ISSN 1473-5644

Development of a real-time PCR assay for the detection and identification of Staphylococcus capitis, Staphylococcus haemolyticus and Staphylococcus warneri

Tadayuki Iwase, Keiko Seki, Hitomi Shinji, Yoshimitsu Mizunoe and Shogo Masuda

Department of Microbiology II, Jikei University School of Medicine, 3-25-8 Nishi-Shinbashi, Minato-Ku, Tokyo 105-8461, Japan

Correspondence
Tadayuki Iwase
iwase.tadayuki{at}jikei.ac.jp

Received 17 February 2007
Accepted 13 June 2007

Staphylococcus capitis, Staphylococcus haemolyticus and Staphylococcus warneri are coagulase-negative staphylococci. Each species has different characteristics, and a difference in pathology is also seen in compromised hosts. Therefore, the development of a species-specific simple detection method for the identification of these staphylococci is important. Here, a species-specific real-time PCR assay is reported that targets the superoxide dismutase A-encoding gene of these bacteria. Primers were designed with a base that was non-complementary with regard to the other bacteria. This base was at the 3' end of the primer (3' mismatch primer) and conferred high specificity. These primers were then evaluated using real-time PCR. They reacted only with the target bacterium. In addition, stable quantitative reactions were observed when experiments were performed using genomic DNA extracted from varying numbers of staphylococci cells (101–107 cells). These results indicate that this method is useful for the identification and quantitative analysis of S. capitis, S. haemolyticus and S. warneri.

Abbreviations: CNS, coagulase-negative staphylococci.




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