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Open AccessCommunication

Characterization of Enterococci- and ESBL-Producing Escherichia coli Isolated from Milk of Bovides with Mastitis in Egypt

1
Friedrich-Loeffler-Institut, Institute of Bacterial Infections and Zoonoses, Naumburger Str. 96a, 07743 Jena, Germany
2
Department of Microbiology, Faculty of Veterinary Medicine, Benha University, Moshtohor Toukh P.O. Box 13736, Benha 13511, Egypt
3
Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Str. 9, 07745 Jena, Germany
4
InfectoGnostics Research Campus Jena e. V., Philosophenweg 7, 07743 Jena, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: George Fthenakis
Pathogens 2021, 10(2), 97; https://doi.org/10.3390/pathogens10020097
Received: 27 December 2020 / Revised: 13 January 2021 / Accepted: 19 January 2021 / Published: 21 January 2021
(This article belongs to the Special Issue Mastitis in Dairy Ruminants)
This study aimed to investigate the prevalence and antimicrobial resistance of enterococci- and ESBL-producing E. coli isolated from milk of bovine mastitis cases in Egypt. Fifty milk samples of dairy animals were collected from localities in the Nile Delta region of Egypt. Isolates were identified using MALDI-TOF MS, and antibiotic susceptibility testing was performed by the broth microdilution method. PCR amplifications were carried out, targeting resistance-associated genes. Seventeen Enterococcus isolates and eight coliform isolates could be cultivated. Vancomycin resistance rate was high in Ent. faecalis. The VITEK 2 system confirmed all E. coli isolates as ESBL-producing. All Ent. faecalis isolates harbored erm(B), tetL and aac-aphD genes. The vanA gene was detected in Ent. faecalis isolate, vanB was found in other Enterococcus, while one isolate of E. casseliflavus exhibited the vanA gene. E. coli isolates exhibited high prevalence of erm(B) and tetL. E. coli isolates were analyzed by DNA microarray analysis. Four isolates were determined by O-serotyping as O8 (n = 1), O86 (n = 2) and O157 (n = 1). H-serotyping resulted in H11, H12, H21 (two isolates each) and one was of H16 type. Different virulence-associated genes were detected in E. coli isolates including lpfA, astA, celB, cmahemL, intI1 and intI2, and the iroN gene was identified by DNA microarray analysis. View Full-Text
Keywords: enterococci; Escherichia coli; resistance gene; DNA microarray; mastitis; Egypt enterococci; Escherichia coli; resistance gene; DNA microarray; mastitis; Egypt
MDPI and ACS Style

Ahmed, W.; Neubauer, H.; Tomaso, H.; El Hofy, F.I.; Monecke, S.; Abd El-Tawab, A.A.; Hotzel, H. Characterization of Enterococci- and ESBL-Producing Escherichia coli Isolated from Milk of Bovides with Mastitis in Egypt. Pathogens 2021, 10, 97. https://doi.org/10.3390/pathogens10020097

AMA Style

Ahmed W, Neubauer H, Tomaso H, El Hofy FI, Monecke S, Abd El-Tawab AA, Hotzel H. Characterization of Enterococci- and ESBL-Producing Escherichia coli Isolated from Milk of Bovides with Mastitis in Egypt. Pathogens. 2021; 10(2):97. https://doi.org/10.3390/pathogens10020097

Chicago/Turabian Style

Ahmed, Wedad; Neubauer, Heinrich; Tomaso, Herbert; El Hofy, Fatma I.; Monecke, Stefan; Abd El-Tawab, Ashraf A.; Hotzel, Helmut. 2021. "Characterization of Enterococci- and ESBL-Producing Escherichia coli Isolated from Milk of Bovides with Mastitis in Egypt" Pathogens 10, no. 2: 97. https://doi.org/10.3390/pathogens10020097

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