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Antibiotic susceptibility of Listeria monocytogenes in Denmark 1958–2001

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Hansen JM, Gerner-Smidt P, Bruun B. Antibiotic susceptibility of Listeria monocytogenes in Denmark 1958–2001. APMIS 2005;113:31–6.

In order to see whether the susceptibility of Danish Listeria monocytogenes strains has changed over the years we examined a collection of human isolates from the period 1958–2001. We, furthermore, wanted to compare L. monocytogenes susceptibility testing using a disc diffusion assay with MIC measurements performed by the E-test. 106 strains isolated predominantly from blood cultures and cerebrospinal fluids were examined together with three reference strains. Susceptibility to the following antibiotics was tested by the E-test and by Oxoid discs using Iso-sensitest agar: penicillin G, ampicillin, meropenem, gentamicin, sulphamethoxazole, trimethoprim, ciprofloxacin, erythromycin, vancomycin, linezolid, chloramphenicol and tetracycline. The strains were in the main sensitive to all antibiotics examined using both methods, except for ciprofloxacin, where the strains were intermediate sensitive. However, for penicillin, ampicillin and sulphamethoxazole, while the disc diffusion assay found the strains to be sensitive, MIC measurements generally placed the strains one dilution above the breakpoint for sensitivity in the intermediate sensitive group. Based on the MIC measurements, the antibiotic susceptibility of L. monocytogenes has not changed in Denmark from 1958 to 2001, and the multiresistant strains found in human infections elsewhere have not been found in Denmark.
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Keywords: E-test; Listeria monocytogenes; disc diffusion; in vitro susceptibility

Document Type: Research Article

Affiliations: 1: Statens Serum Institut, Copenhagen, Denmark 2: Department of Clinical Microbiology, Hillerød Hospital, Hillerød,

Publication date: 2005-01-01

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