As a small introductory project, I want to compare gene sequences of  different strains of flu virus.Are there publicly available databases of flu virus gene sequences?
Publicly available gene sequence database for viruses?
database;public databases;genome sequencing
There area few different influenza virus database resources:The Influenza Research Database (IRD) (a.k.a FluDB - based upon URL)A NIAID Bioinformatics Resource Center or BRC which highly curates the data brought in and integrates it with numerous other relevant data typesThe NCBI Influenza Virus ResourceA sub-project of the NCBI with data curated over and above the GenBank data that is part of the NCBIThe GISAID EpiFlu DatabaseA database of sequences from the Global Initiative on Sharing All Influenza Data. Has unique data from many countries but requires user agree to a data sharing policy.The OpenFluDBFormer GISAID database that contains some sequence data that GenBank does not have.For those who also may be interested in other virus databases, there are:Virus Pathogen Resource (VIPR)A companion portal to the IRD, which hosts curated and integrated data for most other NIAID A-C virus pathogens including (but not limited to) Ebola, Zika, Dengue, Enterovirus, and Hepatitis CLANL HIV databaseLos Alamos National Laboratory HIV database with HIV data and many useful tools for all virus bioinformaticsPaVE: Papilloma virus genome database (from quintik comment)NIAID developed and maintained Papilloma virus bioinformatics portalDisclaimer: I used to work for the IRD / VIPR and currently work for NIAID.