The Influenza Virus Resource, published by the National Center for Biotechnology Information (NCBI), presents gene sequence data from the 2009 A(H1N1) influenza virus, or 'swine flu', outbreak and tools for analysis and annotation. It aims to help scientists compare virus strains so that emerging variations can be more quickly identified and appropriate vaccines developed.

The NCBI site also links to other resources hosting flu sequences, relevant publications and general information about flu viruses, including flu epidemics and flu virus biology.