Presidential address. Parasites can never do only one thing.
D000049:Acanthocephala; D000818:Animals; D003048:Coccidiosis / Q000469:parasitology; D006373:Helminthiasis / Q000469:parasitology; D049673:History, 20th Century; D006790:Host-Parasite Interactions; D006801:Humans; D007249:Inflammation; D008288:Malaria / Q000469:parasitology; D010272:Parasitic Diseases / Q000469:parasitology*; D010274:Parasitology / Q000266:history; D012552:Schistosomiasis / Q000469:parasitology; D014235:Trichinellosis / Q000469:parasitology; D014481:United States