title: Protective immunity to Nippostrongylus brasiliensis in the rat. II. Adaptation by worms.
mesh_terms: D000220:Adaptation, Biological; D000723:Ancylostomatoidea / Q000254:growth & development / Q000276:immunology; D000818:Animals; D006725:Hookworm Infections / Q000276:immunology*; D007109:Immunity; D007112:Immunity, Maternally-Acquired; D007114:Immunization; D007814:Larva; D010270:Parasite Egg Count; D051381:Rats; D013997:Time Factors