Important Update

In Fall 2024, NCBI plans to redirect the Influenza Virus Resource to NCBI Virus, possibly as soon as September. We are working to replicate the highly-used features from this resource prior to the redirection. For most up-to-date and accurate virus data, see NCBI Virus

Protein or nucleotide sequences can be retrieved from the database using GenBank accession numbers or search terms.

Multiple queries can be built by clicking the "Add Query" button every time a new query is made, and queries in any combination from the Query Builder can be selected to get sequences in the database. Sequences can be downloaded, and it is possible to analyze them using the multiple sequence alignment or tree building tool integrated to the database.

Get sequences by accession

Enter a comma or space separated list of sequence accessions or upload text file with this list.

Select sequence type:
Search for keyword: How to use keywords?
Define search set:
Collection date  What is collection date range?
Release date  What is the release date range?