The immunity arising from continuous low-level infection with Eimeria tenella.
D000818:Animals; D001835:Body Weight; D002645:Chickens; D003048:Coccidiosis / Q000209:etiology / Q000276:immunology / Q000662:veterinary*; D004539:Eimeria / Q000276:immunology*; D005243:Feces; D006400:Hematocrit; D007114:Immunization; D008297:Male; D010270:Parasite Egg Count; D011201:Poultry Diseases / Q000209:etiology / Q000276:immunology*