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Antimicrobial resistance in colonizing group B Streptococci before the implementation of a Swedish intrapartum antibiotic prophylaxis program
Umeå University, Faculty of Medicine, Department of Clinical Microbiology, Clinical Bacteriology.
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2010 (English)In: European Journal of Clinical Microbiology and Infectious Diseases, ISSN 0934-9723, E-ISSN 1435-4373, Vol. 29, no 10, 1195-1201 p.Article in journal (Refereed) Published
Abstract [en]

The prevalence of antibiotic resistance and their genetic determinants in colonizing group B streptococci (GBS) sampled in a Swedish nationwide survey was examined. In five GBS isolates (1.3%), kanamycin/amikacin resistance and the presence of the aphA-3 gene was identified. Three of these isolates carried the aad-6 gene and were streptomycin-resistant. Screening with kanamycin and streptomycin 1,000-μg disks enabled a rapid and easy detection of these isolates. In all, 312/396 (79%) GBS were tetracycline-resistant and 95% of the examined isolates harbored the tetM gene. Among the 22 (5.5%) GBS resistant to erythromycin and/or clindamycin, the ermB gene was detected in nine isolates (41%) and erm(A/TR) in ten isolates (45%). A high level of erythromycin and clindamycin resistance with minimum inhibitory concentrations (MICs) >256 mg/L was found in four serotype V isolates that harbored ermB. The erythromycin/clindamycin resistance was distributed among all of the common serotypes Ia, Ib, II, III, IV, and V, but was not present in any of the 44 serotype III isolates associated to clonal complex 17. Screening for penicillin resistance with 1-μg oxacillin disks showed a homogenous population with a mean inhibition zone of 20 mm. A change in the present oxacillin breakpoints for GBS is suggested.

Place, publisher, year, edition, pages
2010. Vol. 29, no 10, 1195-1201 p.
National Category
Infectious Medicine
URN: urn:nbn:se:umu:diva-40769DOI: 10.1007/s10096-010-0877-3PubMedID: 20706855OAI: diva2:402707
Available from: 2011-03-09 Created: 2011-03-09 Last updated: 2011-12-15Bibliographically approved

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Granlund, MargaretaHåkansson, Stellan
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