title: Collaborative study of the assay for virus content of Marek's disease vaccines using a reference preparation.
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D006564:Herpesviridae / Q000276:immunology; D008381:Herpesvirus 2, Gallid / Q000276:immunology*; D011309:Preservation, Biological; D012015:Reference Standards; D014422:Turkeys; D010948:Viral Plaque Assay; D014765:Viral Vaccines / Q000592:standards*
chemical_list: D014765:Viral Vaccines