RESUMO
Salmonellosis is one of the most important zoonotic diseases throughout the world. The purpose of this study was to characterize a large collection of Salmonella isolates from different poultry sources in Iran. A total of 123 Salmonella isolates from different poultry sources were subjected to drug susceptibility test, hemolysin production, motility test, and plasmid profile [50 isolates]. Seventy-one resistance patterns were found to 29 antimicrobial agents among 123 Salmonella isolates, in which 81% of isolates were resistant to more than one antibacterial agent. The resistance patterns of 123 isolates to 10 commonly used antibacterials in Iranian poultry industry were also quite variable and included 31 patterns. Four different plasmid patterns were found among 50 Salmonella isolates. Fifty four percent of Salmonella isolates harbored one or three plasmids with approximate molecular size ranging from 2.3 to 68 kb. No plasmid was detected in 46% of isolates. A band of 68 kb size was detected in all isolates that harbored plasmid. All isolates were motile but no isolate showed hemolysin production. The frequency of resistance to antibacterial agents among avian Salmonella isolates is a major public health concern
RESUMO
Salmonella Enteritidis [SE] is frequently isolated from poultry and humans. Chicken meat and egg are two important sources of SE infection for humans. This study was conducted to detect the SE infection in Iranian poultry farms using serological methods. A number of 8208 serum samples were provided from 171 poultry flocks [pullet, commercial layer, broiler breeder, layer breeder, grandparent breeder, and broiler] and were analyzed by rapid slide agglutination test [RSA] and ELISA. All samples were negative in RSA but 45% 1 of samples [from 112 flocks] contained anti-SE antibody in ELISA. The titres ranged 0.476-0.590, which were at low level and showed the value of ELISA vs. RSA. The results indicated that the poultry flocks had been infected with SE at least once during the course of production. This is the first comprehensive study, at this sample size, in Iran regarding the serologic profile of SE in poultry flocks and its findings are very important for poultry industry and the control strategy for SE infection