The recognition of viruses of the avian leucosis-sarcoma group and other viruses that interfere with Marek's disease research.
D000256:Adenoviridae; D001355:Alpharetrovirus; D000818:Animals; D002478:Cells, Cultured; D002642:Chick Embryo; D002645:Chickens; D003588:Cytopathogenic Effect, Viral; D004372:Ducks; D004625:Embryo, Nonmammalian; D005347:Fibroblasts; D006564:Herpesviridae; D007668:Kidney; D008380:Marek Disease / Q000382:microbiology* / Q000401:mortality; D008854:Microscopy, Electron; D012087:Reoviridae; D014422:Turkeys