Fig. 1.

Phylogenetic tree outlining relatedness between pathogenic RNA viruses. Relations are as outlined by the International Committee on Taxonomy of Viruses (ICTV). Groupings are shown at the levels of Orders, Families, and Genera. Viruses found on the WHO R&D Blueprint priority list are underlined. Abbreviations are as follows: FluA, influenza A virus; FluB, influenza B virus; CCHFV, Crimean-Congo hemorrhagic fever virus; RVFV, Rift Valley fever virus; LASV, Lassa virus; EBOV, Ebola virus; RSV, respiratory syncytial virus; RV, rabies virus; MERS-CoV, Middle East respiratory syndrome coronavirus; SARS-CoV, severe acute respiratory syndrome coronavirus; NoV, norovirus; PV, poliovirus; HAV, hepatitis A virus; ZIKV, Zika virus; DENV, dengue virus; HCV, hepatitis C virus; EV71, enterovirus 71; YFV, yellow fever virus; CHIKV, chikungunya virus; NiV, Nipah virus.