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Open AccessArticle

Characterization of Staphylococci and Streptococci Isolated from Milk of Bovides with Mastitis in Egypt

Friedrich-Loeffler-Institut, Institute of Bacterial Infections and Zoonoses, Naumburger Str. 96a, 07743 Jena, Germany
Department of Microbiology, Faculty of Veterinary Medicine, Benha University, PO Box 13736 Moshtohor Toukh, Egypt
Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Str. 9, 07745 Jena, Germany
InfectoGnostics Research Campus Jena e. V., Philosophenweg 7, 07743 Jena, Germany
Author to whom correspondence should be addressed.
Pathogens 2020, 9(5), 381;
Received: 20 April 2020 / Revised: 13 May 2020 / Accepted: 14 May 2020 / Published: 15 May 2020
(This article belongs to the Section Animal Pathogens)
The aim of this study was to characterize staphylococci and streptococci in milk from Egyptian bovides. In total, 50 milk samples were collected from localities in the Nile Delta region of Egypt. Isolates were cultivated, identified using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS), and antibiotic susceptibility testing was performed by the broth microdilution method. PCR amplifications were carried out, targeting resistance-associated genes. Thirty-eight Staphylococcus isolates and six Streptococcus isolates could be cultivated. Staphylococcus aureus isolates revealed a high resistance rate to penicillin, ampicillin, clindamycin, and erythromycin. The mecA gene defining methicillin-resistant Staphylococcus aureus, erm(C) and aac-aphD genes was found in 87.5% of each. Coagulase-negative staphylococci showed a high prevalence of mecA, blaZ and tetK genes. Other resistance-associated genes were found. All Streptococcus dysgalactiae isolates carried blaZ, erm(A), erm(B), erm(C) and lnuA genes, while Streptococcus suis harbored erm(C), aphA-3, tetL and tetM genes, additionally. In Streptococcus gallolyticus, most of these genes were found. The Streptococcus agalactiae isolate harbored blaZ, erm(B), erm(C), lnuA, tetK, tetL and tetM genes. Streptococcus agalactiae isolate was analyzed by DNA microarray analysis. It was determined as sequence type 14, belonging to clonal complex 19 and represented capsule type VI. Pilus and cell wall protein genes, pavA, cadD and emrB/qacA genes were identified by microarray analysis. View Full-Text
Keywords: Staphylococcus; Streptococcus; resistance gene; DNA microarray; mastitis; Egypt Staphylococcus; Streptococcus; resistance gene; DNA microarray; mastitis; Egypt
MDPI and ACS Style

Ahmed, W.; Neubauer, H.; Tomaso, H.; El Hofy, F.I.; Monecke, S.; Abdeltawab, A.A.; Hotzel, H. Characterization of Staphylococci and Streptococci Isolated from Milk of Bovides with Mastitis in Egypt. Pathogens 2020, 9, 381.

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