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Cited by 454

The DOI matches its Crossref record; 18 of the 18 references it cites were found in a registry or an index.

Practical Disk Diffusion Method for Detection of Inducible Clindamycin Resistance in Staphylococcus aureus and Coagulase-Negative Staphylococci

Open access
Fiebelkorn, K. R., Crawford, S. A., McElmeel, M. L., Jorgensen, J. H.·2003·Journal of Clinical Microbiology

Abstract

Resistance to macrolides in staphylococci may be due to active efflux (encoded by msrA ) or ribosomal target modification (macrolide-lincosamide-streptogramin B [MLS B ] resistance; usually encoded by ermA or ermC ). MLS B resistance is either constitutive or inducible following exposure to a macrolide. Induction tests utilize closely approximated erythromycin and clindamycin disks; the flattening of the clindamycin zone adjacent to the erythromycin disk indicates inducible MLS B resistance. The present study reassessed the reliability of placing erythromycin and clindamycin disks in adjacent positions (26 to 28 mm apart) in a standard disk dispenser, compared to distances of 15 or 20 mm. A group of 130 clinical isolates of Staphylococcus aureus and 100 isolates of erythromycin-resistant coagulase-negative staphylococci (CNS) were examined by disk approximation; all CNS isolates and a subset of S. aureus isolates were examined by PCR for ermA , ermC , and msrA . Of 114 erythromycin-resistant S. aureus isolates, 39 demonstrated constitutive resistance to clindamycin, while 33 showed inducible resistance by disk approximation at all three distances. Only one isolate failed to clearly demonstrate induction at 26 mm. Of 82 erythromycin-resistant CNS isolates that contained ermA or ermC , 57 demonstrated constitutive clindamycin resistance, and 25 demonstrated inducible resistance, at 20 and 26 mm. None of the 42 S. aureus isolates or 18 CNS isolates containing only msrA and none of the erythromycin-susceptible isolates yielded positive disk approximation tests. Simple placement of erythromycin and clindamycin disks at a distance achieved with a standard disk dispenser allowed detection of 97% of S. aureus strains and 100% of CNS strains with inducible MLS B resistance in this study.

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Metadata

Authors
Fiebelkorn, K. R., Crawford, S. A., McElmeel, M. L., & Jorgensen, J. H.
Venue
Journal of Clinical Microbiology
Published
2003-10
Volume
41
Issue
10
Pages
4740-4744
ISSN
  • 0095-1137 (ISSN-L)
  • 1098-660X
OpenAlex
W2115362037
Cited by
454
References
18
FWCI
10.40
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Practical Disk Diffusion Method for Detection of Inducible Clindamycin Resistance in Staphylococcus aureus and Coagulase-Negative Staphylococci. https://app.cochat.ai/papers/10.1128/jcm.41.10.4740-4744.2003
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Fiebelkorn, K. R., Crawford, S. A., McElmeel, M. L., & Jorgensen, J. H. (2003). Practical Disk Diffusion Method for Detection of Inducible Clindamycin Resistance in Staphylococcus aureus and Coagulase-Negative Staphylococci. Journal of Clinical Microbiology. https://doi.org/10.1128/jcm.41.10.4740-4744.2003

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