الفهرس | Only 14 pages are availabe for public view |
Abstract In the present work, 400 swabs (200 nasal and 200 tracheal swabs) of 20 flkocks chickens with respiratory manifestations collected from EI- Sharkia and El-Dakahlia Governorates from different breeds with different ages all over the year seasons. The specimens were examined phenotypically and genotypic ally for the detection of the most important virulence genes of MG and E. coli ORT and Haemophilus paragallinarum. Concerning to the prevalence of single and mixed infection with MG, E. coli, ORT and Haemophilus paragallinarum in respiratory manifested birds , the recorded results revealed that E. coli was highly detected with a percentage of 19/20 flocks followed by ORT 6/20 then MG 4/20 and Haemophilus paragallinarum 3/20 and discuss the mixed infection between different microorganisms as Flock No. 6, 8, 15,20 are mixed between E. coli and MG also Flock No 4, 10,12,18,20 mixed between E. coli and ORT but Flock No 7, 17 are mixed between E. coli and Haemophilus paragallinarum, Flock No 13 are mixed infection between ORT and Haemophilus paragallinarum flock No 20 the flock is mixed infection between E. coli, MG and ORT. In our study, none the flocks had single infection by either ORT or Haemophilus paragallinarum. The two microorganisms were persistent either mixed with E. coli infection or mixed with each other (flock No 13). E. coli infection is a predisposing factor playing an important role in the severity and spread ofORT infection. |