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Background    Salmonella  is one of major causes of foodborne outbreaks globally. This study was conducted to estimate the prevalence, typing and antibiotic susceptibilities of  Salmonella enterica  serovars isolated from 41 broiler chicken farms located in Kafr El-Sheikh Province in Northern Egypt during 2014–2015. The clinical signs and mortalities were observed.    Results  In total 615 clinical samples were collected from broiler flocks from different organs (liver, intestinal content and gall bladder).  Salmonella  infection was identified in 17 (41%) broiler chicken flocks and 67  Salmonella  isolates were collected. Recovered isolates were serotyped as 58 (86.6%)  S. enterica  serovar Typhimurium, 6 (9%)  S. enterica  serovar Enteritidis and 3 (4.5%) were non-typable. The significant high mortality rate was observed only in 1-week-old chicks.  sop E gene was detected in 92.5% of the isolates which indicating their ability to infect humans. All  S. enterica  serovar Enteritidis isolates were susceptible to all tested antimicrobials. The phenotypically resistant  S. enterica  serovar Typhimurium isolates against ampicillin, tetracycline, sulphamethoxazole and chloramphenicol were harbouring  Bla TEM, ( tet A and  tet C), ( sul 1 and  sul 3) and ( cat 1 and  flo R), respectively. The sensitivity rate of  S. enterica  serovar Typhimurium to gentamycin, trimethoprim/sulphamethoxazole and streptomycin were 100, 94.8, 89.7%, respectively. The silent streptomycin antimicrobial cassettes were detected in all  Salmonella  serovars. A class one integron ( dfr A12,  orf F and  aad A2) was identified in three of  S. enterica  serovar Typhimurium strains.    Conclusions  To the best of our knowledge, this study considered first report discussing the prevalence, genotyping, antibiotic susceptibility and public health significance of  S. enterica  serovars in broilers farms of different ages in Delta Egypt. Further studies are mandatory to verify the location of some resistance genes that are within or associated with the class one integron.

Epidemiological, molecular characterization and antibiotic resistance of Salmonella enterica serovars isolated from chicken farms in Egypt