Abstract
Nimaviridae (class Naldaviricetes) is a family of double-stranded DNA viruses infecting crustaceans, with the only officially recognized representative being white spot syndrome virus (WSSV). Chionoecetes opilio bacilliform virus (CoBV) was isolated as the causative agent of milky hemolymph disease in the snow crab Chionoecetes opilio, an economically important crustacean in the northwestern Pacific. Here, we present the complete genome sequence of CoBV and show that it is unambiguously a nimavirus. The CoBV genome is a 240-kb circular DNA molecule with 40% GC content that encodes 105 proteins, including 76 WSSV orthologs. Phylogenetic analysis based on eight naldaviral core genes established that CoBV is a member of the family Nimaviridae. The availability of the CoBV genome sequence provides a deeper understanding of CoBV pathogenicity and nimavirus evolution.
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