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Circoviridae, Circovirus, Cyclovirus, ICTV report, taxonomy

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The family Circoviridae comprises viruses with small, circular, single-stranded DNA (ssDNA) genomes, including the smallest known animal viruses. Members of this family are classified into two genera, Circovirus and Cyclovirus, which are distinguished by the position of the origin of replication relative to the coding regions and the length of the intergenic regions. Within each genus, the species demarcation threshold is 80 % genome-wide nucleotide sequence identity. This is a summary of the International Committee on Taxonomy of Viruses (ICTV) Report on the taxonomy of the Circoviridae, which is available at


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Mya Breitbart, Eric Delwart, Karyna Rosario, Joaquim Segales, Arvind Varsani, and ICTV Report Consortium

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Journal of General Virology, v. 98, p. 1997-1998

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