title: Serial passage of Eimeria tenella and E. necatrix in turkey embryos.
abstract: The serial passage of 3 strains of Eimeria from the chicken in embryonating turkey embryos is reported here. All 3 strains increased their reproduction in turkey embryos; reproduction being equal to or better than the same lines maintained in chicken embryos. Pathogenicity and immunogenicity trials conducted in chickens using these 3 strains of Eimeria showed that all 3 turkey embryo-adapted lines were significantly less pathogenic than the parent lines. Only 1 of the lines (E. tenella (PS) turkey embryo-adapted) maintained its immunogenic potential.
mesh_terms: D000222:Adaptation, Physiological; D000818:Animals; D002645:Chickens / Q000469:parasitology; D003048:Coccidiosis / Q000517:prevention & control / Q000662:veterinary; D004539:Eimeria / Q000276:immunology / Q000472:pathogenicity / Q000502:physiology*; D004625:Embryo, Nonmammalian / Q000469:parasitology*; D007114:Immunization; D011201:Poultry Diseases / Q000517:prevention & control; D014422:Turkeys / Q000469:parasitology*