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Cherry Valley breeder ducks in Shandong province in northern China have experienced swollen eyes, lachrymation, pox scabs on glabrous or glabrous skin, depression and dysentery since 2021. The spread of this infectious disease has seriously affected the breeder ducks in major Cherry Valley duck farms in China. The virus causing clinical signs in Cherry Valley breeder ducks was isolated by chicken embryo inoculation. We successfully isolated a strain of duck pox virus from diseased breeder ducks by virus replication. We have also successfully conducted experiments for duck pox disease using the isolated strains to infect ducklings. By comparison with 22 pox viruses already published in GenBank, the virus strain obtained in this study was most homologous (about 99.7%) to the strain isolated from infected domestic ducks in Guangxi, China in 2014 (KJ192189), and belonged to the same A5 subtype. Since there were no previous cases of avian pox virus infecting white or Cherry Valley duck breeds, this study identified a new host for avian pox virus infection and provided theoretical support and data for the development of avian pox virus research. RESEARCH HIGHLIGHTSAvian pox virus can infect a new host type – Cherry Valley breeder ducks.The avian pox virus isolated from Cherry Valley breeder ducks showed highest identity with Guangxi hemp duck-derived avian pox virus.Cherry Valley breeder ducks were infected with avian pox virus of subtype A5. Avian pox virus can infect a new host type – Cherry Valley breeder ducks. The avian pox virus isolated from Cherry Valley breeder ducks showed highest identity with Guangxi hemp duck-derived avian pox virus. Cherry Valley breeder ducks were infected with avian pox virus of subtype A5.

Genetic characteristics and pathogenicity of avian pox virus for a new host, Cherry Valley breeder ducks in China