This is a taxonomic list of viruses according to the most recent (2014) taxonomy release by the International Committee on Taxonomy of Viruses (ICTV), placed into the groups of the Baltimore classification system. Though not used by the ICTV, Baltimore classification, which groups viruses together based on how they produce mRNA, is used in conjunction with the ICTV's work in modern virus classification.[1][2][3][4][5][6]