title: Nippostrongylus brasiliensis: observations on factors affecting the establishment of secondary worm populations in rats.
mesh_terms: D000367:Age Factors; D000723:Ancylostomatoidea / Q000276:immunology*; D000818:Animals; D005260:Female; D006725:Hookworm Infections / Q000209:etiology / Q000276:immunology*; D007279:Injections, Subcutaneous; D007814:Larva / Q000276:immunology; D008297:Male; D051381:Rats