Frequency of Salmonella Typhimurium in Egg Shell and Determination of Antibiotic Resistance of Isolates

Egg products are most often associated with outbreaks of Salmonella typhimurium (S. typhimurium) infection. Salmonella is the leading cause of foodborne illnesses and several outbreaks have been reported where eggs were the source of human infection. A total of 230 samples were randomly collected from various shops in Chaharmahal Va Bakhtiari province located in southwest of Iran. Conventional biochemical and serological test methods were used to identify the suspected salmonella. All the isolates were indicated the zoonotic potential of S. typhimurium. An antimicrobial susceptibility test was performed by using disk diffusion method. S. typhimurium was detected in the egg contents of 21 samples (9.13 %) and 19 samples (8.26%) out of 230 samples by PCR and culture methods respectively. The overall of isolated samples strains to antimicrobial agents was 86.1% for Ampicillin, 86.1% for Cephalexin and 45% for Kanamycin, have more resistant, respectively. The findings of the present study indicate pandemic multiple drug resistant S. typhimurium in egg shell samples; there is an urgent need to improve the hygienic level of consumed eggs.

Salmonella Typhimurium, Egg Shell