Susceptibility to Teicoplanin and Daptomycin among Coagulase-Negative Staphylococci Isolated from Bloodstream Infections in Patients with Hematological Malignancies
Introduction: Recently, a decreased susceptibility to teicoplanin has been observed among coagulase-negative staphylococci (CNS) isolated from bloodstream infections in patients with hematological malignancies. In this study, we aimed to determine the minimum inhibitory concentrations (MIC) of teico...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Bilimsel Tip Yayinevi
2011-06-01
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| Series: | Flora Infeksiyon Hastalıkları ve Klinik Mikrobiyoloji Dergisi |
| Subjects: | |
| Online Access: | http://www.floradergisi.org/getFileContent.aspx?op=REDPDF&file_name=2011-16-2-067-070.pdf |
| Summary: | Introduction: Recently, a decreased susceptibility to teicoplanin has been observed among coagulase-negative staphylococci (CNS) isolated from bloodstream infections in patients with hematological malignancies. In this study, we aimed to determine the minimum inhibitory concentrations (MIC) of teicoplanin, which is frequently used in the empirical treatment, and of a new agent, daptomycin, against CNS isolated from bloodstream infections. Materials and Methods: The study was performed on CNS strains isolated from bloodstream infections of patients with hematological malignancies during the period 2009-2011. Susceptibility to oxacillin was tested by disk diffusion method. Daptomycin and teicoplanin MIC were determined using the E-test method. Results: A total of 179 CNS strains causing bloodstream infections were studied. Among them, S. epidermidis (36.3%) and S. haemolyticus (35.2%) were the most frequent CNS species. The oxacillin resistance rate was found statistically higher among S. haemolyticus (61%) strains than among S. epidermidis (32%) (p= 0.001). Although teicoplanin and daptomycin resistance was not detected among the CNS isolates, two (1.1%) of the isolates demonstrated intermediate susceptibility to teicoplanin. Conclusions: S. haemolyticus and S. epidermidis were the major causes of bloodstream infections in patients with hematological malignancies. Oxacillin resistance was more frequent among S. haemolyticus isolates. Teicoplanin resistance was not detected among the CNS isolates. However, because two of the isolates demonstrated decreased susceptibility to teicoplanin, resistance rates to teicoplanin should be closely monitored. Daptomycin was found to be effective against both oxacillin-resistant and teicoplanin-intermediate CNS isolates. |
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| ISSN: | 1300-932X 1300-932X |