Page 259 - Avian Virology: Current Research and Future Trends

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Table 9.1 Animal viruses with small, covalently linked, circular single-stranded DNA genomes
Family a Circoviridae (2) Anelloviridae (12)
Genome Ambisense Negative sense
Replication associated protein Yes No
Genus Circovirus Cyclovirus Alphatorquevirus Gyrovirus
No. of species recognized by ICTV b 11 28 29 1
No. of species in chickens c 1 2 1 2
a Anelloviridae has currently 12 genera, only two of which have been identified in chickens.
b Based on Afdams et al. (2016) and earlier on-line reports of the ICTV.
c Only one species, chicken anaemia virus, has officially been recognized by the ICTV.

Figure 9.2 Neighbour-joining phylogenetic tree of VP1 nucleotide sequences rooted on torque teno virus (TTV) showing the relationships
between the chicken anaemia viruses (CAVs), intermediate gyrovirus (GyV3), and th avian gyrovirus (AGV2s) and human gyrovirus (HGyVs).
Bootstrap support (1000 iterations) indicated as per cent at each node. Scale bar represents fixed nucleotide substitutions per site. GenBank
accession numbers of each taxa provided. Figure courtesy of Ian E. H. Voorhees.