Fowl adenoviruses (FAdVs) 8b type isolated from chickens with inclusion body hepatitis (IBH) in Japan from 2018 to 2019 were characterized serologically and genetically. Serologically, all isolates were well neutralized by antisera against the FAdV-8b strain, but they were not neutralized by antisera against the FAdV-8a strain. Phylogenetic analysis based on the part of the hexon gene that included the L1 region revealed that these isolates were all identical. They were also identical to foreign strains such as the SD1356 strain isolated in China, and they belonged to the FAdV-8b. Furthermore, the 2018-2019 Japanese IBH 8b isolates were also genetically identical to the SD1356 strain based on phylogenetic analysis of fiber genes, but they were different from previous Japanese 8b strains. These findings suggest that the 2018-2019 Japanese IBH isolates might have been introduced from other countries.

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