title: Observations on a Trichinella spiralis isolate from a polar bear.
mesh_terms: D000818:Animals; D002335:Carnivora / Q000469:parasitology*; D005260:Female; D005615:Freezing; D008297:Male; D051379:Mice; D014234:Trichinella / Q000254:growth & development / Q000472:pathogenicity / Q000502:physiology*; D001503:Ursidae / Q000469:parasitology*