title: Acquired resistance to experimental Heterakis gallinarum infections in pheasants: relative immunity conferred by exposure to heterakids of different ages.
mesh_terms: D000367:Age Factors; D000818:Animals; D001715:Bird Diseases / Q000188:drug therapy / Q000276:immunology*; D001717:Birds; D002645:Chickens / Q000469:parasitology; D005260:Female; D007110:Immunity, Active; D007114:Immunization; D007978:Levamisole / Q000627:therapeutic use; D008297:Male; D009348:Nematoda / Q000033:anatomy & histology / Q000276:immunology*; D009349:Nematode Infections / Q000188:drug therapy / Q000276:immunology / Q000662:veterinary*; D014422:Turkeys / Q000469:parasitology
chemical_list: D007978:Levamisole