title: Presence of a togavirus-like agent in cell cultures from specific pathogen free chick embryos.
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D002642:Chick Embryo / Q000382:microbiology*; D005347:Fibroblasts / Q000382:microbiology; D005856:Germ-Free Life; D013047:Specific Pathogen-Free Organisms; D014035:Togaviridae / Q000302:isolation & purification*