Single-stranded DNA virusesViruses in this category include the Anelloviridae, Circoviridae, and Parvoviridae (which infect vertebrates), the Geminiviridae and Nanoviridae(which infect plants), and the Microviridae (which infect prokaryotes). Most of them have circular genomes (the parvoviruses are the only known exception). Eukaryote-infecting viruses replicate mostly within the nucleus - usually via a rolling circle mechanism, forming double-stranded DNA intermediate in the process. A prevalent but asymptomatic human Anellovirus, called Transfusion Transmitted Virus (TTV), is included within this classification.

ssDNA viruses

§ Unassigned bacteriophage families

§ Family Inoviridae

§ Family Microviridae

§ Unassigned families

§ Family Anelloviridae

§ Family Circoviridae

§ Family Geminiviridae

§ Family Nanoviridae

§ Family Parvoviridae - includes Parvovirus B19

There are a number of additional viruses that have not been classified to date. These are the parvovirus like viruses. These viruses has linear single stranded DNA genomes but unlike the parvoviruses the genome is bipartate. This group includes the Ina-flacherie virus (Bombyx mori parvo-like virus), Lymphoidal parvo-like virus, Hepatopancreatic parvo-like virus and Bombyx mori densovirus type 2. They have only been isolated from invertebrates to date and their relationships to other groups has not yet been established.