Benha University

اية عماد عبدالرحيم ابراهيم

مدرس مساعد

كلية الطب البيطري الجراثيم والفطريات والمناعة

Comprehensive phenotypic, MALDI-TOF, and molecular characterization of Listeria monocytogenes isolated from sheep with reproductive and neurological disorders in Egypt

Benha Veterinary Medical Journal • 2025
العودة
معلومات البحث
المؤلفون Aya E. Ibrahim, Ashraf A. Abd El-Tawab, Fatma I. El-hofy, Manar Elkhayat
الكلمات المفتاحية Sheep, Listeria monocytogenes, antimicrobial resistance, virulence genes, MALDI-TOF MS.
المجلة العلمية Benha Veterinary Medical Journal
الناشر Faculty of Veterinary Medicine, Benha University
المجلد 49
العدد 1
الصفحات 6
publication.type Local
رابط البحث Not Available
المواد المرفقة Not Available
الملخص
Listeria monocytogenes (L. monocytogenes) is a significant cause of abortion and neurological disorders in sheep, leading to substantial economic losses in livestock production. This study aimed to characterize L. monocytogenes isolated from sheep with reproductive and neurological disorders by assessing their antimicrobial resistance and virulence gene profiles using phenotypic, proteomic, and molecular approaches. Seventy clinical specimens (n=70) were obtained from sheep, including 40 placental tissues/uterine fluids and 30 brain abscesses. The overall prevalence was 14.28%, with slightly higher rates in placental tissues (15%) and brain abscesses (13.33%). Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) detected ten isolates as L. monocytogenes. Polymerase chain reaction (PCR) confirmed that all strains carried the hlyA and inlA genes linked to virulence and the ability to invade host cells. Antimicrobial susceptibility testing showed complete resistance to cefotaxime (100%) and varying levels of resistance to fosfomycin (60%), gentamicin (40%), ciprofloxacin (30%), and meropenem (10%). However, all strains were susceptible to amoxicillin-clavulanic acid, levofloxacin, amikacin, doxycycline, and linezolid. No multidrug-resistant (MDR) strains were detected for the used antibiotics. These findings emphasize the importance of continued surveillance of L. monocytogenes and prudent antibiotic use in sheep farming systems.
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