The Anelloviridae are a recently discovered family of viruses . They are classified as a vertebrate viruses and have a non-enveloped capsid, which is round with isometric, icosahedral symmetry.

The type species is torque teno virus (genus Alphatorquevirus).[1]


The genome is not segmented and contains a single molecule of circular, negative-sense, single-stranded DNA. The complete genome is 3000–4000 nucleotides long.[2]


Anellovirus species are highly prevalent and genetically diverse. They cause chronic human viral infections that have not yet been associated with disease.[3]

Three genera are associated with human infections: Torque teno virus (TTV), Torque teno midi virus (TTMDV) and Torque teno mini virus (TTMV).


  1. Vasilyev EV, Trofimov DY, Tonevitsky AG, Ilinsky VV, Korostin DO, Rebrikov DV (2009). "Torque Teno Virus (TTV) distribution in healthy Russian population". Virology Journal. 6: 134. doi:10.1186/1743-422X-6-134. PMC 2745379Freely accessible. PMID 19735552.
  2. ICTVdB Management (2006). Anellovirus. In: ICTVdB—The Universal Virus Database, version 4. Büchen-Osmond, C. (Ed), Columbia University, New York, USA
  3. Bernardin F, Operskalski E, Busch M, Delwart E (May 2010). "Transfusion transmission of highly prevalent commensal human viruses". Transfusion. 50 (11): 2474–2483. doi:10.1111/j.1537-2995.2010.02699.x. PMID 20497515.

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