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Daptomycin MICs by Broth Microdilution Method Against Staphylococcus aureus in Clinical Specimens: A Cross-Sectional Study from Pakistan

Author(s)
Mohammad Zeeshan Department of Pathology and Laboratory Medicine, Microbiology Section, The Aga Khan University Hospital,Karachi,Pakistan
Imran Ahmed Department of Pathology and Laboratory Medicine, Microbiology Section, The Aga Khan University Hospital,Karachi,Pakistan
Seema Irfan Department of Pathology and Laboratory Medicine, Microbiology Section, The Aga Khan University Hospital,Karachi,Pakistan
Moiz Ahmed Khan Department of Pathology, Indus Hospital and Health Network,Karachi,Pakistan
Afia zafar Department of Pathology and Laboratory Medicine, Microbiology Section, The Aga Khan University Hospital,Karachi,Pakistan
Abstract
Objective: To explore the distribution of daptomycin (DAP) minimum inhibitory concentrations (MICs) inStaphylococcus aureus isolated from complicated skin, soft tissue, and bloodstream infections collected from the Pakistani population using broth microdilution (BMD). Study Design: Descriptive, cross-sectional study. Place and Duration of the Study: Department of Pathology and Laboratory Medicine, The Aga Khan University Hospital, from May to October 2021. Methodology: Through consecutive sampling techniques, 169 Staphylococcus aureus (S. aureus) isolated from clinical specimens including pus, tissue, and blood were collected. Patients data including age, gender, geographical location, specimen site, and methicillin susceptibility were collected from the laboratory data. BMD was used to determine MICs of clinical isolates and S.aureus ATCC 29213. DAP MIC d1.0 µg/ml was considered susceptible according to the Clinical and Laboratory Standards Institute M100. Results: Among all the clinical isolates, 144 (85%) and 25 (15%) were from skin and soft tissue and blood, respectively. All isolates were susceptible to DAP with MIC50, MIC90, and MIC range of 0.25 µg/ml, 0.5 µg/ml, and 0.06 0.5 µg/ml, respectively. Conclusion: These study ndings demonstrated low in-vitro MICs for DAP against S. aureus in tested isolates from a diverse variety of patient specimens from across Pakistan.
Publication Details
Page(s) 27-31
Published Journal: Journal of College of Physicians and Surgeons--Pakistan : JCPSP, Volume: 34, Issue: 1, Year: 2024

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Keywords
Minimum inhibitory concentrations, Staphylococcus Aureus, Broth microdilution, Daptomycin
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