Circoviridae

Circovirus Gyrovirus

The Circoviridae are a family of viruses, including the following genera:
 * Genus Circovirus; type species: Porcine circovirus type 1 and 2, BFDV (Beak and Feather Disease Virus)
 * Genus Gyrovirus; type species: Chicken anaemia virus

The family Circoviridae contains two genera, Circovirus and Gyrovirus. These are small, relatively poorly-studied viruses with circular, single-stranded DNA genomes of approximately one to four kilobases.