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Open Veterinary Journal
Zagazig university
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| Abstract: |
Background: Food safety is a serious challenge in the face of increasing population and diminishing resources.
Staphylococcus aureus is a critical foodborne pathogen characterized by its capability to secret a diverse range of heatresistant enterotoxins. Antibiotic usage in dairy herds resulted in the occurrence of antimicrobial resistance (AMR)
patterns among bacterial species, which were consequently transmitted to humans via dairy products. Lactic acid
bacteria (LAB) produce bacteriocins, which provide an excellent source of natural antimicrobials with the further
advantage of being environmentally friendly and safe.
Aim: Detection of multidrug resistance (MDR) S. aureus isolates in concerned samples, molecular characteristics,
biofilm production, and the inhibitory role of LAB against it.
Methods: Random samples of raw milk and other dairy products were analyzed for S. aureus isolation. Phenotypic
and genotypic assessment of AMR was performed, in addition to detection of classical enterotoxin genes of S. aureus.
Finally, evaluation of the antimicrobial action of some Lactobacillus strains against S. aureus.
Results: Incidence rates of presumptive S. aureus in raw milk, Kariesh cheese, and yogurt samples were 50%, 40%,
and 60%, respectively. The highest resistance of S. aureus was to Kanamycin (100%) and Nalidixic acid (89.3%),
respectively. (78.66%) of S. aureus were MDR. 11.1% of S. aureus carried mecA gene. In concern with enterotoxins
genes, PCR showed that examined isolates harbored sea with a percentage of (22.2%), while sed was found in (11.1%)
of isolates. Regarding biofilm production, (88.88%) of S. aureus were biofilm producers. Finally, agar well diffusion
showed that Lactobacillus acidophilus had the strongest antimicrobial action against S. aureus with inhibition zone
diameter ranging from 18 to 22 mm.
Conclusion: There is a widespread prevalence of MDR S. aureus in raw milk and dairy products. Production of
staphylococcal enterotoxins, as well as biofilm production are responsible for public health risks. Therefore, installing
proper hygienic routines and harsh food safety policies at food chain levels is substantial.
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