عنوان مقاله [English]
Avian infectious bronchitis (IB) is caused by corona viruses. Infectious bronchitis virus (IBV) is a major cause of economic losses in poultry and can be involved in respiratory disease, nephritis, and both poor egg production and quality by reproductive tract infection. IBV has many serotypes that do not confer cross protection against each other. The aim of this study was conducted to detect IBV serotypes in broiler chicken farms of Guilan province were involveled with clinical signs respiratory disease. In the present study, tracheal and lung tissue samples were collected randomly from 28 broiler chicken farms with respiratory signs. Reverse Transcription Polymerase Chain Reaction (RT-PCR) method was done after extraction of RNA virus from samples for diagnosis of IBV. 20 flocks (70%) out of 28 flocks were positive. Nested- PCR method was performed for detection of 3 serotypes of IBV (Mass, 793/B and D274) by using of specific primers. The results showed that 13samples (65%) belonged to Mass serotype, 7 samples(35%) to 793/B and both of Mass, 793/B serotypes were detected from 2 samples (10%), but in all of samples D274 serotype was not detected. In conclusion, for the best immunity against IB in broiler flocks of Guilan province, using of 2 serotypes (Mass, 793/B) in vaccination programs with biosecurity in farms are recommended.
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