الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 127 |  |  |
| | | from | 127 | | |
Abstract
Abstract
Infectious bronchitis virus (IBV) variant strains cause a major problem in
the Egyptian poultry industry. Genetic mutations has been occurred during
replication of coronaviruses including Infectious bronchitis. Serotypic and/or
genotypic classification of IBV is mainly based on the S1 subunit of Spike (S)
gene. In the present study, tracheal samples of broiler flocks were collected from
El-Bihara governorate. Samples collected from birds of high mortalities and
suspected to be infected by IBV. The collected samples were assayed for the
presence of IBV using RT-PCR assay. The obtained results showed that the
isolated strain was closely related to the previously isolated Egyptian strains of
IBV. Phylogenetic analysis revealed that it is belonging to IBV
IS/1494/06 . The results reports the association of the isolated IBV strain
IS/1494/06 – like with mortalities in broiler chicken. This study addressed the
importance of molecular characterization to study the evolution of IBV strains in
nature.