A total of 304 random chicken egg samples obtained from layers of Balady and Battery systems. 144 of chicken Balady and Battery eggs (72 of each sample were divided into 18 batches) were used for bacteriological evaluation. Enterobactriacae (94.4, 33.3 and 27.7%), Salmonella (77, 29 and 22%), E.coli (44, 0 and 22%) and Staphylococcus aureus (100, 97 and 98%) were detected in shell, albumen and yolk in Balady eggs, respectively. Battery system showed lower incidence in Enterobactriacae (50, 16.6 and 22%), Salmonella (41.6, 8 and 0%), E.coli (27.7, 9 and 19%) and Staphylococcus aureus (100, 83 and 95%), respectively. Results concluded that the system in which the hens are housed contribute in rate of contamination of eggs. Staphylococcus aureus showed a higher prevalence rate compared to other pathogens in both laying systems. About 160 Balady eggs were selected for studying the effect of different pathogen inhibitors, 80 eggs for detecting preservation after 21 days at room temperature and the other 80 fertile Balady eggs for detecting hatchability and mortality. The efficacy of application of different pathogen inhibitors as Propionic acid at different concentration 10, 30, 50, 70 and 100%, Hydrogen Peroxides (H 2 O 2 ) 3% and Virkon S 1% on eggs were recorded. Propionic acid10%, Virkon S and H 2 O 2 showed nearly similar significant inhibitory effect on pathogens on egg shells ranged from 86 to 100%, albumin from 33.4 to 100% and yolk from 34.3 to100%, while 30% Propionic acid has highly significant inhibitory effect on pathogen load ranged from 99.8 to100%. About 30% propionic acid concentration had a preservative effect on table eggs for 21 days at room temperature and increasing hatching percent up to 90% and lowering embryonic mortality to10% in fertile eggs. The findings of this study indicate that 30% Propionic acid may be considered as a favorable disinfectant agent for the egg shell spraying.

The present study aimed to investigate the molecular epidemiology and resistance patterns of S. Ohio isolates. All the Ohio isolates were resistant to more than three of the antibiotics, upto 10 antimicrobial agents. Overall, the highest proportions were found for resistance to the following agents: Tetracycline (100%), Nalidixic acid (94.7%), Doxycycline (94.7%), low level resistance to Ciprofloxacin  (89.4%),Kanamycin (84.2%), Sulphafurazole (78.9%), and Co-Trimoxazole(52.6%).A total of 11 (DI = 0.958) antimicrobial  resistance patterns were observed among 19 isolates of S. Ohio, with a MAR index value ranged between 0.2 to 0.43. The frequency of resistance to Te/Cip/Na/Dox was found in 17 (90%) of the 19 MDR S. Ohio isolates. Genotyping of S. Ohio isolates using 10-mer arbitrary primer, p1254 revealed five RAPD types, denoted by English letters from A to E yielding DI of 0.53, whereas RAPD analysis with primer OPA-4 discriminated only four patterns which assigned F to I (figure), yielding DI of 0.44. When the results of RAPD (with two primers) and antibiotic susceptibility tests are combined, 19 isolates of S. Ohio could be divided into 12 different profiles (DI=0.97). The finding of this study indicated that the broiler chicken can serve as a zoonotic reservoir of MDR bacteria which can be transmitted to human. This is an important implication for human health, because infections with MDR bacteria are difficult to treat and often requires expensive and long term therapy. The RAPD technique can be a useful tool for the analysis of S. Ohio strains. The method might be used as easy, faster, and cost-effective tool for molecular epidemiology research in each laboratory.