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: July 16, 2025
Viral classificationNo. of uniq tax idHost classificationNo. of uniq tax id
I: dsDNA22869 Bacteria 0
Eukaryota0
Archaea 0
Viruses 6
Unassigned/Other22519
II: ssDNA4802 Bacteria 0
Eukaryota0
Archaea 0
Viruses 2
Unassigned/Other4040
III: dsRNA435 Bacteria 0
Eukaryota0
Archaea 0
Viruses 0
Unassigned/Other403
IV: ssRNA(+)3984 Bacteria 0
Eukaryota0
Archaea 0
Viruses 0
Unassigned/Other3714
V: ssRNA(-)1279 Bacteria 0
Eukaryota0
Archaea 0
Viruses 0
Unassigned/Other1190
VI: ssRNA-RT135 Bacteria 0
Eukaryota0
Archaea 0
Viruses 0
Unassigned/Other127
VII: dsDNA-RT154 Bacteria 0
Eukaryota0
Archaea 0
Viruses 0
Unassigned/Other148
Other RNA viruses1020 Bacteria 0
Eukaryota0
Archaea 0
Viruses 2
Unassigned/Other1012
Others464 Bacteria 0
Eukaryota0
Archaea 0
Viruses 2
Unassigned/Other435
RefSeq
GenBank
Viral entries
(No. of sequence accessions)
43000
Source of host information (No. of evidence records)
RefSeq + GenBank UniProt Viral Zone Manual annotation Total
30981 1724 217 13980 42283