After accumulating data through a nationwide survey, we characterized the recent prevalences and geographic distributions of various genotypes of infectious bronchitis virus (IBV) on layer farms in Japan. RT-PCR analysis of fecal samples revealed the presence of the IBV nucleoprotein (N) gene on approximately 30% of the farms surveyed. N-gene detection rates were higher in Chugoku and Kyushu than in the remaining surveyed regions. Phylogenetic analysis of S1 gene sequences revealed that genotypes JP-I, JP-II, JP-III, and Mass were particularly prevalent, with JP-I isolated throughout the country. In addition, JP-II was the genotype detected most frequently in Chugoku, and JP-III was the most frequent in Kyushu. Unlike in the previous results obtained in 1998 through 2003, the European-prevalent 4/91 genotype was no longer circulating in Japan. In addition, the number of prefectures where multiple genotypes were detected simultaneously had increased since 1998 through 2003.
First nationwide survey of infectious bronchitis virus on layer farms in Japan during 2015 (Revised title)
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Masahiko Kaneda, Sayaka Takahashi, Ikunori Naito, Yusuke Chiba, Hirokazu Hikono, Kenji Murakami; First nationwide survey of infectious bronchitis virus on layer farms in Japan during 2015 (Revised title). Avian Dis doi: https://doi.org/10.1637/12026-011019-ResNote.1
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