Virus-Host DB organizes data about the relationships between viruses and their hosts, represented in the form of pairs of NCBI taxonomy IDs for viruses and their hosts. Virus-Host DB covers viruses with complete genomes stored in 1) NCBI/RefSeq and 2) GenBank whose accession numbers are listed in EBI Genomes or INPHARED. The host information is collected from RefSeq, GenBank (in free text format), UniProt, ViralZone, and manually curated with additional information obtained by literature surveys.

Selected viral families
Adenoviridae Papillomaviridae Herpesviridae
Baculoviridae Poxviridae Parvoviridae
Retroviridae Reoviridae Picornaviridae
Flaviviridae Caliciviridae Coronaviridae
Bunyaviridae Orthomyxoviridae Paramyxoviridae
Annotated virusesLast Update: August 29, 2025
Viral classificationNo. of uniq tax idHost classificationNo. of uniq tax id
I: dsDNA22865 Bacteria 21015
Eukaryota1254
Archaea 198
Viruses 8
Unassigned/Other390
II: ssDNA5076 Bacteria 432
Eukaryota3001
Archaea 12
Viruses 4
Unassigned/Other1631
III: dsRNA459 Bacteria 13
Eukaryota416
Archaea 0
Viruses 0
Unassigned/Other30
IV: ssRNA(+)3989 Bacteria 26
Eukaryota3020
Archaea 0
Viruses 0
Unassigned/Other943
V: ssRNA(-)1285 Bacteria 1
Eukaryota1150
Archaea 0
Viruses 0
Unassigned/Other134
VI: ssRNA-RT134 Bacteria 0
Eukaryota133
Archaea 0
Viruses 0
Unassigned/Other1
VII: dsDNA-RT154 Bacteria 0
Eukaryota154
Archaea 0
Viruses 0
Unassigned/Other0
Other RNA viruses997 Bacteria 0
Eukaryota78
Archaea 0
Viruses 2
Unassigned/Other917
Others170 Bacteria 4
Eukaryota77
Archaea 0
Viruses 0
Unassigned/Other89
RefSeq
GenBank
Viral entries
(No. of sequence accessions)
42885
Source of host information (No. of evidence records)
RefSeq + GenBank UniProt Viral Zone Manual annotation Total
30518 1682 205 14595 42161