Work in Brazil was partially supported by CNPq grants 302987/2008? 8, 302584/2015?3 (MRTN), 306581/2016?7 (DBAM) and 303999/ 2016?0 (PFCV), and the Instituto Evandro Chagas/Brazilian Ministry of Health. JAL was supported by the Instituto Nacional de Ci^encias e tecnologia para febres hemorragicas virais (465481/2014 ?0). Work in the USA was funded in part by grant R24 AI 120942 from the U.S. National Institutes...