Provides viral sequence data hosted by the National Center for Biotechnology Information. The Virus Variation Resource includes modules for seven viral groups: influenza virus, Dengue virus, West Nile virus, Ebolavirus, MERS coronavirus, Rotavirus A and Zika virus. Each module is supported by pipelines that scan newly released GenBank records, annotate genes and proteins, parse sample descriptors and map them to controlled vocabulary. These processes in turn support a purpose-built search interface where users can select sequences based on standardized gene, protein and metadata terms. Once sequences are selected, a suite of tools for downloading data, multi-sequence alignment and tree building supports a variety of user directed activities.