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Avian infectious bronchitis (IB) is a highly contagious respiratory disease of chickens caused by a Coronavirus, infectious bronchitis virus (IBV). Although IBV is primarily a respiratory tract pathogen, it is also a common cause of reduced egg production and egg quality in laying hens, and certain strains of IBV cause kidney lesions with significant mortality. Mortality by tracheal blockage also occurs. The disease has high economic importance due the loss of production, which is more important than the loss by mortality. The occurrence of multiple serotypes and mutants of the IBV have complicated and increased the production costs and have impaired its prevention through immunization. Recently, a variant IBV has been reported associated with pectoral muscle myopathy in many parts of world including Brazil.

Key words
Avian infectious bronchitis virus; pectoral muscle myopathy; antigenic variation

Instituto Biológico Av. Conselheiro Rodrigues Alves, 1252 - Vila Mariana - São Paulo - SP, 04014-002 - São Paulo - SP - Brazil