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Infectious Bronchitis Virus Field Vaccination Coverage and Persistence of Arkansas-type Viruses in Commercial Broilers

Important Findings This study showed that infection with infectious bronchitis virus (IBV) vaccines administered to commercial broiler flocks in the field follow either a parabolic type curve or a sinusoidal type wave and in none of the studies did vaccine virus completely clear from the flock. In addition, the data showed that Arkansas-type vaccines were persisting in the birds and that adequate protection against Arkansas challenge was lacking, which suggests that locally protective antibodies against Arkansas were not present in the trachea.