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特許 権利維持 The viral genus Circovirus is a part of the family of Circoviridae and contains viral species with circular single-stranded DNA genomes. These viruses are known to infect vertebrate species, including pigs[1] dogs[2] and birds such as pigeons[3] and ducks.[4] The virions of Circoviruses are surprisingly small, with diameters ranging from 17 up to 22 nm.