Optimum age for vaccinating chickens against Marek's disease.
D000367:Age Factors; D000818:Animals; D001353:Avian Leukosis / Q000473:pathology / Q000517:prevention & control*; D002645:Chickens; D006564:Herpesviridae / Q000276:immunology*; D007279:Injections, Subcutaneous; D010523:Peripheral Nervous System Diseases / Q000473:pathology / Q000517:prevention & control; D011201:Poultry Diseases / Q000473:pathology / Q000517:prevention & control*; D014611:Vaccination / Q000662:veterinary; D014765:Viral Vaccines / Q000008:administration & dosage*
D014765:Viral Vaccines