Abstract
DNA-DNA reassociation studies were performed with coagulase-positive staphylococci belonging to the biotypes A, B, C, D, E and F. These studies present genetic evidence for the existence of at least two distinct species within this group of organisms. The common Staphylococcus aureus strains were represented by organisms from biotypes A to D, and their DNA revealed over 80% nucleotide sequence homology under restrictive conditions. Less than 15% DNA homology was detected between strains from biotypes A to D (S. aureus) and those from biotypes E and F. The DNA of organisms from either the biotypes E or F displayed over 70% homology. Together, both biotypes are considered to represent the species S. intermedius. However, DNA homology values dropped to 50–65% between strains from different biotypes. This may justify the separation of S. intermedius biotypes E and F on a subspecies level.
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Abbreviations
- O.D.:
-
optical density
- SSC:
-
standard saline citrate buffer (0.15 M NaCl, 0.015 M sodium citrate, pH 7.0)
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This work was supported by Deutsche Forschungsgemeinschaft
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Meyer, S.A., Schleifer, K.H. Deoxyribonucleic acid reassociation in the classification of coagulase-positive staphylococci. Arch. Microbiol. 117, 183–188 (1978). https://doi.org/10.1007/BF00402306
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DOI: https://doi.org/10.1007/BF00402306