عنوان مقاله [English]
نویسندگان [English]چکیده [English]
Among diseases caused by Escherichia coli, there is a severe systemic form termed colisepticaemia, which is characterized by the presence of E. coli in the blood, and colonization of organs including the heart, liver and spleen. The aim of the present study was to investigate different phylogenetic groups of E. coli isolated from broiler breeder with colibacillosis in Urmia. In this study, eighty swabs collected from liver and lung were cultured on MacConkey agar plates. Pink color colonies were isolated and confirmed as E.coli by biochemical tests and followed by multiplex-PCR to identify different phylogenetic groups. Out of 80 samples 21 isolates were identified as E.coli. Eight of isolates (38%) were belong to group A, 2 of them (9.5%) were belong to group B1, 6 of them (28.6%) were belong to group B2 and 5 of them (23.8%) were belong to group D2. According to the results of present study different phylogenetic group were observed in breeder herds. Most of them were classified as group A which is commensal. Studies showed that pathogenic E.coli has a considerable antibiotic resistance rate which might be transmitted to broilers in different ways and poses economic constraint to poultry industry. Thus, important strides must be made on eradication of different pathogenic E.coli.