CercocebusPapioCercocebus atysPapio anubisPapio hamadryasPapio cynocephalusCercopithecidaePapio ursinusPrimate T-lymphotropic virus 3Monkey DiseasesApe DiseasesSimian T-lymphotropic virus 1Papio papioDeltaretrovirus InfectionsCameroonPhylogenySimian immunodeficiency virusTheropithecusCercopithecinae