Infectious bronchitis virus CA99 serotype was isolated from several broiler flocks in Northern California. The virus caused late-onset respiratory disease and increased airsacculitis condemnation in affected flocks despite the use of an established infectious bronchitis virus vaccination program. An experimental study compared Holland/Arkansas and Massachusetts/Arkansas vaccination protocols to determine the efficacy of commercial infectious bronchitis virus vaccines in reducing respiratory disease and airsacculitis lesions found at processing that were associated with a CA99 field isolate. All vaccination groups were given Massachusetts/Connecticut strains of infectious bronchitis virus vaccines at age 1 day followed by vaccination with either Holland/Arkansas or Massachusetts/Arkansas vaccine strains at 18 days of age. Birds were challenged at age 31 days with a CA99 field isolate. Gross pathology, histopathology, and virus isolation were evaluated. Chickens vaccinated with Holland/Arkansas had marginally better protection against CA99 challenge than chickens vaccinated with Massachusetts/Arkansas, although differences were not statistically significant.
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1 June 2007
Evaluation of the Effectiveness of Two Infectious Bronchitis Virus Vaccine Programs for Preventing Disease Caused by a California IBV Field Isolate
Michael P. Martin,
P. S. Wakenell,
P. Woolcock,
B. O'Connor
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Avian Diseases
Vol. 51 • No. 2
June 2007
Vol. 51 • No. 2
June 2007
airsacculitis
broiler chickens
CA99
IBV vaccination
infectious bronchitis
poultry
respiratory disease