title: Selection of avirulent variants of Rift Valley fever virus.
mesh_terms: D000818:Animals; D001103:Arboviruses / Q000472:pathogenicity*; D014644:Genetic Variation; D008297:Male; D051379:Mice; D012296:Rift Valley fever virus / Q000472:pathogenicity*; D012641:Selection, Genetic; D014774:Virulence; D014776:Virus Cultivation