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ache alimentary anisakiasis anisakis ascarid ascaris background black body cestoda cestoidea contaminant digestive disease flatworm gastro gut helminth hookworm human illness illustration infection intestinal medical medicine nematoda nematode pain parasite parasitic parasitology pathogen pinworm schistosomiasis silhouette simple stomachache taenia tapeworm threadworm tract trematoda vector whipworm white worm