Detection of Coagulase-Negative Staphylococci (CoNS) in some Pathogenic Samples and Medical Devices and Determining Their Antibiotic Resistance Pattern
Rafidain Journal of Science,
2020, Volume 29, Issue 4, Pages 11-24
AbstractThis study was conducted to detection of bacterial types belonged to (CoNS) group from pathogenic sources and medical devices and studying the pattern of their resistance to different antibiotics. 120 samples (pathogenic samples, surgical instruments and tools) were collected from some hospitals in Mosul city for the period from August 2019 until January 2020, Various diagnostic methods were used, which included phenotypic methods (Cultural, microscopic and biochemical) and the use of the Api Staph system, and Vitek system. The sensitivity of the isolated bacteria to (12) antibiotics was tested.
The CoNS bacterium group was isolated from all studied sources and (37) isolates were obtained, at a rate of (52.8%) of the total staphylococci, and it prevailed on Staphylococcus aureus in many cases, and the isolated species included Staphylococcus epidermidis (12 isolates 32.4%) followed by Staphylococcus saprophyticus (8 isolates 21.6%), then Staphylococcus hemolyticus and Staphylococcus hominis (6 isolates 16.2%) for each of them, then Staphylococcus lentus (3 isolates 8.1%) Finally, Staphylococcus sciuri (2 isolates 5.4%).
Antibiotic sensitivity results of CoNS isolates showed high resistance to Tetracyclin 89.1% (%), Penicillin (86.4%), Erythromycin 81%), and Oxacillin 78.3%), respectively, and in lower percentage to the rest of the studied antibiotics. Isolates are absolutely sensitive (100%) to the Vancomycin and high sensitivity for Ofloxacin (89.1%) and Novobiocin (72.9%). These results confirm the prevalence of different bacteria belonging to the CoNS group in the various pathogenic sources, and their health importance and severity associated with their high resistance to antibiotics.
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