Phenotypic and genotypic features of Staphylococcus aureus strains isolated from cattle and humans

Abstract

The aim of this study was to determine susceptibility patterns of S. aureus strains (46 were isolated from bovine milk samples with mastitis, 35 from bovine teat skins, 3 from bovine noses, 3 from caretaker hands and 3 from caretaker noses) to various antibiotics by E-tets and was to define genotypic characteristics of these isolates by plasmid and Pulsed Field Gel Electrophoresis (PFGE) analyses. According to E-test results, the percentages of S. aureus isolates resistant to penicilin G, tetracycline, erythromycin, oxacilline and enrofloxacin were found to be 85.4% (82), 39.6% (38), 5.2% (5), 3.1% (3) and 1.0% (1), respectively. Nine different types were determined in the plasmid analyses of the isolates. In 87 (90.6%) of the isolates, 10 different types of plasmids with the sizes between 1.8 -19 kb were determined while no plasmid was detected from the 9 (9.4%) of the isolates. Genetic relationships among S. aureus isolates were performed using PFGE method and 42 distinct PFGE patterns were identified. Strains were assigned as 13 major lineage groups (A, B, C, D, E, F, G, H, I, J, K, L, M) with respect to the genetic relationships. 58.3% (56 samples) of strains were clustered as pulsotype A. In conclusion, according to plasmid analysis and PFGE data, a clone of S. aureus was broadly detected in dairy farms in Kırıkkale province

Keywords

• Antibiotic resistance
• MIC
• PFGE
• plasmid analyses
• Staphylococcus aureus

İnsan ve sığır kökenli Staphylococcus aureus izolatlarının fenotipik ve genotipik özelliklerinin araştırılması

Abstract

Bu çalışma, Staphylococcus aureus izolatlarının (46 mastitisli inek sütü, 35 inek meme başı derisi, 3 inek burun, 3 bakıcı el ve 9 bakıcı burun sürüntü örneğinden) E-test metoduyla çeşitli antibiyotiklere karşı duyarlılık profilleri ile plazmid ve Pulsed Field Gel Elektroforez (PFGE) analizleriyle genotipik özelliklerini belirlemek amacıyla yapıldı. E-test sonuçlarına göre, S. aureus izolatlarının penisilin G, tetrasiklin, eritromisin, oksasilin ve enrofloksasin dirençleri sırasıyla %85.4 (82), %39.6 (38), %5.2 (5), %3.1 (3) ve %1.0 (1) olarak belirlendi. Plazmid analizleri ile 9 farklı tipte plazmid profili belirlendi. Analizleri yapılan izolatların 87 (%90.6) tanesinde 1.8-19 kb arasında değişen büyüklükte on farklı plazmid belirlendi ve izolatların 9 tanesinde (%9.4) plazmid saptanamadı. PFGE tiplendirme verilerine göre S. aureus izolatları genetik yakınlık bakımından 42 farklı paterne ve 13 ana gruba (A, B, C, D, E, F, G, H, I, J, K, L, M) ayrıldı. İzolatların % 58.3’ü (56 adet) A pulsotipinde gruplandırıldı. Sonuç olarak plazmid analizleri ve PFGE verilerine göre, Kırıkkale ve çevresindeki süt sığırcığı işletmelerinde mastitislerden sorumlu yaygın bir S. aureus klonunun var olduğu görüldü

Keywords

• Antibiyotik direnci
• MİK
• PFGE
• plazmid analizi
• Staphylococcus aureus

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