Egg transmission studies of type II leukosis infection (Marek's disease).
D000818:Animals; D001353:Avian Leukosis / Q000276:immunology*; D001354:Avian Leukosis Virus / Q000302:isolation & purification*; D002642:Chick Embryo / Q000276:immunology; D011201:Poultry Diseases / Q000276:immunology*