Infectious bronchitis virus variants in chickens: evolution, surveillance, control and prevention
نویسندگان
چکیده
Infectious bronchitis is a disease of the upper respiratory tract chickens caused by Gammacoronavirus (infectious virus, IBV). Severe economic losses are IBV due to reduction in egg production and/or quality layers addition poor feed conversion and increased condemnations broiler chickens. The extreme variability this virus part its RNA genome, which predisposes it mutations generates genetic variation. In addition, recombination events add virus. was first described 1956 Jungherr. Since then, dozens serotypes hundreds genotypes have been reported. Variant strains those that, can escape from immunity generated conventional strains, despite not being ful ly different affecting geographic region. At genomic level, these differences be equal or greater than 5% hypervariable region S1 gene. These variant usually restricted regions most time transient, reason why diagnostics epidemiological surveillance crucial determine their existence persistence. main goal assist development efficient preventative measures field. This review aims critically analyse literature related judiciously comment discuss on howto better prevent poultry endemic disease.
منابع مشابه
Infectious Bronchitis Virus Variants: Molecular Analysis and Pathogenicity Investigation
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ژورنال
عنوان ژورنال: Austral journal of veterinary sciences
سال: 2021
ISSN: ['0719-8000', '0719-8132']
DOI: https://doi.org/10.4067/s0719-81322021000100055