Appearance of virulence in two strains of avian mycoplasma possibly transfected with the genome of Ranikheit disease virus.
D000818:Animals; D002478:Cells, Cultured; D002642:Chick Embryo; D005347:Fibroblasts; D009174:Mycoplasma / Q000472:pathogenicity*; D009522:Newcastle disease virus; D012367:RNA, Viral; D014170:Transformation, Genetic; D014774:Virulence
D012367:RNA, Viral