الفهرس 
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Abstract
The current study was carried out on a total of 100 abattoir swab samples represented as beef carcasses’ surfaces (brisket, rump), abattoir effluents, floors, and walls (20 of each) which were randomly collected from El-Qurein abattoir, Sharkia Governorate, Egypt. The present investigation was designed as follows: Microbiological assessment of abattoir samples including aerobic plate count (APC), total Staphylococcus count (TSC), detection of staphylococci and its serotypes, Salmonellae and its serotype, antimicrobial susceptibility of S. aureus and Salmonella species, molecular identification of Sal. Typhimurium virulence genes, the ability of Sal. Typhimurium to perform a biofilm, in addition, in vitro investigation of the efficiency of garlic and thyme essential oils against the biofilm formed by Sal. Typhimurium.
The obtained results revealed that APC had a mean value of 4.87±0.01 log10 CFU/cm2 in brisket, 4.41±0.05 log10 CFU/cm2 in rump, 5.89±0.01 log10 CFU/cm2 in abattoir effluents, 5.65±0.02 log10 CFU/cm2 in floors, and 5.06±0.01 log10 CFU/cm2 in walls.