title: Immunosuppression by the infectious bursal agent in chickens immunised against Newcastle disease.
mesh_terms: D000818:Animals; D002060:Bursa of Fabricius / Q000276:immunology*; D002645:Chickens / Q000276:immunology*; D007165:Immunosuppression Therapy / Q000662:veterinary*; D009522:Newcastle disease virus / Q000276:immunology*; D013997:Time Factors; D014611:Vaccination / Q000662:veterinary