RNA viruses because I already had that list in my mind: Hendra and Nipah, Ebola and Marburg, West Nile, Machupo, Junin, the influenzas, the hantas, dengue and yellow fever, rabies and its cousins, chikungunya, SARS-CoV, and Lassa, not to mention HIV-1 and HIV-2. All of them carry their genomes as RNA. The