Key result
The frequency of histopathologically confirmed renal lesions in chickens with infectious bronchitis virus was significantly higher from 2014 to 2018 (72.7%) compared to 2008 to 2009 (16.7%).
Observational (n=17)
The study demonstrates an altered pathotype of infectious bronchitis virus in chickens in Kagoshima, Japan, with an increase in renal lesions and predominance of JP-III and JP-I genotypes.
Rising IBV renal lesions in Japanese poultry suggest pathotype shift; leaves open whether vaccines need updating.
Infectious bronchitis (IB) is a highly contagious disease in chickens, induced by IB virus (IBV) infection. The pathotype and S1 genotype of IBV field strain that was detected from 2008 to 2018 were investigated in Kagoshima prefecture, Japan. The frequency of cases that the renal lesion characteristic of IBV infection was histopathologically confirmed was significantly higher from 2014 to 2018 than from 2008 to 2009, suggesting the altered pathotype of IBV. Of 7 genotypes (JP-I, JP-II, JP-III, JP-IV, Mass, Gray, and 4/91) that have been detected in Japan, 6 genotypes except for JP-II were detected since 2008 and it appeared that the JP-III and JP-I have been predominant. The JP-IV with different antigenicity from other genotypes was detected since 2009.
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IWAMOTO et al. (2020) conducted an observational in Infectious bronchitis virus (IBV) infection (n=17). IBV infection in 2014-2018 vs. IBV infection in 2008-2009 was evaluated on Frequency of histopathologically confirmed renal lesions (p=0.0498). The frequency of histopathologically confirmed renal lesions in chickens with infectious bronchitis virus was significantly higher from 2014 to 2018 (72.7%) compared to 2008 to 2009 (16.7%).
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