Abstract

Objective: The aim of this study was to evaluate the distribution and antimicrobial susceptibility of the microorganisms isolated from blood cultures in our hospital and to contribute the choice of empirical antibiotics for treatment.

Methods: The blood cultures were performed by BacT/Alert® 3D (bioMérieux, Marcy l’Etoile, France) and BACTEC 9050 (Becton Dickinson Co., Sparks, MD, USA). Beside standard microbiological methods, isolates were identified by VITEK® 2 (bioMérieux, Marcy l’Etoile, France) and Phoenix 100 (Becton Dickinson Co., Sparks, MD, USA) systems.

Results: A total of 11 559 blood cultures obtained from hospitalized patients between 2010 and 2015 were evaluated. Microbial growth was detected in 2809 (24.3%) of the blood cultures. The most common isolates included 1000 (35.6%) coagulase-negative staphylococci 782 (27.8%) S. aureus and 303 (10.8%) Escherichia coli. In our study, methicillin resistance ratio was 70.1% in Staphylococcus spp. Enterococcus spp. had a vancomycin resistance of 3%. The most effective antibiotics for Enterobacteriaceae were found as carbapenems and amikacin. Carbapenem resistance has been observed in Klebsiella spp. since 2014. Imipenem and meropenem were the most effective antibiotics for Pseudomonas aeruginosa in nonfermenters, whereas tigecycline and colistin for Acinetobacter baumannii.

Conclusions: The distribution of microorganisms isolated from bloodstream infections and their antibiotic susceptibility changes by time. These changes should continually be monitored in healthcare centers, because monitoring decreases morbidity and mortality by guiding empirical treatment. 

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