Circoviridae

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Circoviridae

a virus family that comprises two genera, Circovirus that includes porcine circoviruses, pigeon circovirus, and psittacine beak and feather disease virus, and Gyrovirus that includes chicken anemia virus. They are the smallest animal viruses, 17 to 24 nm in diameter, contain a single-stranded circular DNA genome composed of about 2500 nucleotides and replicate in the nucleus of cells and are assumed to be dependent on the host cell for many functions required for viral replication and probably, like parvoviruses, replicate in cells that are in the S-phase of the cell cycle.