Key result
Antibodies to at least three types of avian infectious bronchitis virus were detected in up to 8.7% of sera from diseased unvaccinated chickens in Pakistan, compared to 0% in healthy flocks.
Cross-Sectional (n=1,000)
Absolute Event Rate: 8.7% vs 0%
At least three AIBV types are circulating in chicken flocks in Pakistan.
Multiple AIBV types may circulate in diseased Pakistani flocks; leaves open needs for targeted surveillance and vaccines.
Using the hemagglutination inhibition test, sera from 20 diseased and 3 apparently healthy chicken flocks in Pakistan were examined for antibodies to four types of avian infectious bronchitis virus (AIBV). These flocks were not vaccinated against AIBV. Of the 900 serum samples from diseased flocks, 78 (8.7%) had antibodies to the Massachusetts (M41) type, 23 (2.6%) to the Arkansas type and 20 (2.2%) to the Connecticut type of AIBV. None had antibodies to the JMK type. None of the sera (n = 100) from apparently healthy layers was positive to any of the four AIBV types tested. Some of the birds with antibody titers exhibited no signs of illness except that they laid pale colored eggs or had a history of poor hatchability. These results indicate that at least three AIBV types are circulating in chicken flocks in Pakistan.
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Muneer et al. (1987) conducted a cross-sectional in Avian infectious bronchitis virus (AIBV) (n=1,000). Diseased chicken flocks vs. Apparently healthy chicken flocks was evaluated on Presence of antibodies to Massachusetts (M41) type AIBV. Antibodies to at least three types of avian infectious bronchitis virus were detected in up to 8.7% of sera from diseased unvaccinated chickens in Pakistan, compared to 0% in healthy flocks.
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