title: Histological evaluation of immune organs in chicken embryos inoculated with Marek's disease virus and lymphokines.
abstract: The aim of the present study was to evaluate the presence of lymphocytes and granulocytes in different stages of embryonic development and on the first posthatching day. The lymphocytes present in the bursa of Fabricius and thymus were evaluated by histological analysis of the yolk sac, bursa of Fabricius, thymus, liver and bone marrow of 100 chicken embryos divided into groups and treated with: (I) Marek's disease vaccine as viral antigen, (II) Marek's disease vaccine plus lymphokines, (III) lymphokines, and (IV) vaccine diluent. Group V was not treated. Samples were taken on days 14, 17 and 20 of incubation and on the first posthatching day. An increase in the number of epithelial matrix as precursors of lymphoid follicles was observed in the bursa of Fabricius of embryos inoculated with lymphokines compared to embryos in all the other groups (p < 0.05). In addition, a higher amount of granulocytes was found in the yolk sac and liver of embryos inoculated with lymphokines than in the embryos of all other groups (p < 0.05). In the bone marrow, no significant difference was observed among the treated groups concerning the amount of granulocytes. The results suggest that administration of antigens or protein molecules at an early stage of embryonic development increases the presence of granulocytes in the liver and granulopoiesis in the yolk sac, and also increases the number of epithelial matrixs in the bursa of Fabricius.
authors.affiliation: Departamento de Producción Animal Aves, Facultad de Medicina, Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, 04510 Ciudad Universitaria, Coyoacán, México D. F., México. monicolim@yahoo.com
authors.forename: M
authors.initials: M
authors.lastname: Ortiz
authors.forename: V M
authors.initials: VM
authors.lastname: Petrone
authors.forename: G
authors.initials: G
authors.lastname: Téllez
authors.forename: T
authors.initials: T
authors.lastname: Fehérvári
mesh_terms: D000818:Animals; D001853:Bone Marrow / Q000276:immunology / Q000821:virology; D002060:Bursa of Fabricius / Q000276:immunology / Q000821:virology; D002642:Chick Embryo / Q000276:immunology* / Q000821:virology; D008381:Herpesvirus 2, Gallid / Q000276:immunology*; D006651:Histocytochemistry / Q000662:veterinary; D008099:Liver / Q000276:immunology / Q000821:virology; D008222:Lymphokines / Q000276:immunology*; D022501:Marek Disease Vaccines / Q000276:immunology*; D011897:Random Allocation; D013047:Specific Pathogen-Free Organisms; D013950:Thymus Gland / Q000276:immunology / Q000821:virology
chemical_list: D008222:Lymphokines; D022501:Marek Disease Vaccines