Co-circulation of different Infectious Bronchitis Virus serotypes In Egypt During 2012
Co-circulation of different Infectious Bronchitis Virus serotypes In Egypt During 2012
Fawzy Rania1, AboElkhair M.1, Bazid A.M.1, Sultan H.2, Hussien A.H.3
ABSTRACT
Variant strains of Infectious bronchitis virus cause a major problem in the Egyptian poultry industry. A mixture of genetic mutations and or recombination events has been occurred during replication of coronaviruses including IBV which called quasispecies. Serotypic and or genotypic classification of IBV is mainly based on the S1 subunit of Spike (S) gene. In the present study, thirty tracheal samples of broiler flocks suspected to be infected with IBV were collected from different Egyptian governorates during 2012. Isolation and genetic characterizations were carried out for only ten samples which were positive for IBVs. Multiple nucleotide and amino acids alignments revealed prominent nucleotide substitutions which affect amino acids composition of HVR3 of S1 subunit. Phylogenetic analysis revealed that seven strains were belonging to variant 2 group of IBV of great similarity with Israeli IB strains, two strains were belonging to IS/1494/06 group like and one strain was belonging to 4/91 group like. This study reports the co-circulation of different IBV serotypes in broiler sectors. Regular monitoring for evolution, epidemiology and genotyping of Egyptian IBV field strains is very important for screening the emergence of new variant strains as well as evaluating the existing vaccination programs.
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