title: Mortality in mute swans in Southern Ontario associated with infestation with the thorny-headed worm, Polymorphus boschadis.
mesh_terms: D000049:Acanthocephala / Q000302:isolation & purification; D000818:Animals; D001715:Bird Diseases / Q000453:epidemiology / Q000401:mortality*; D006373:Helminthiasis / Q000401:mortality; D006374:Helminthiasis, Animal; D009864:Ontario