title: The nature of resistance of immune puppies to superinfection with Toxocara canis: evidence that immunity affects second-but not fourth-stage larvae.
mesh_terms: D000818:Animals; D000871:Anthelmintics / Q000627:therapeutic use; D000917:Antibody Formation; D001196:Ascariasis / Q000097:blood / Q000188:drug therapy / Q000276:immunology*; D002951:Citrates; D003168:Complement Fixation Tests; D004285:Dogs; D005243:Feces / Q000032:analysis; D007106:Immune Sera / Q000494:pharmacology; D007109:Immunity; D007114:Immunization; D007422:Intestines; D007814:Larva / Q000254:growth & development / Q000276:immunology; D008099:Liver; D008168:Lung; D010270:Parasite Egg Count; D010879:Piperazines / Q000627:therapeutic use; D013997:Time Factors; D014119:Toxocara / Q000254:growth & development* / Q000276:immunology
chemical_list: D000871:Anthelmintics; D002951:Citrates; D007106:Immune Sera; D010879:Piperazines