Francis Peyton Rous (1879-1970) wani Ba'amurke masanin ilimin halittu ne kuma masanin rigakafi wanda aka ba shi lambar yabo ta Nobel a fannin Physiology ko Medicine a 1966 saboda gano ƙwayoyin cuta masu haifar da ƙari, waɗanda aka sani da oncoviruses. Rous ya gano cewa kwayar cutar na iya haifar da ciwace-ciwacen daji a cikin kaji, wanda ya samar da abin koyi na nazarin rawar ƙwayoyin cuta a cikin ciwon daji. Ayyukansa sun kafa harsashin fannin ilimin ƙwayoyin cuta kuma ya taimaka wajen samar da alluran rigakafin kamuwa da ƙwayoyin cuta.