Vaccination of bursectomised chickens with inactivated Marek's disease virus‐specific antigens

Abstract
Bursectomised chickens were protected against Marek's disease (MD) by vaccination with inactivated MD virus‐specific antigens. The immunity was associated with lowered lymphocyte‐associated MD viraemia following challenge. Evidence is presented that the immunity was not dependent on a humoral immune response but possibly on the presence of lymphocytes sensitised to virus‐specific antigens.