Etiology and Presentation. Commonly referred to as roundworms (Ascaris lumbricoides), whipworms (Trichuris trichiura), pinworms (Enterobius vermicularis), and hookworms (Necator americanus, Ancylostoma duodenale, and A ceylanicum), intestinal nematodes are complex, nonsegmented, multicellular worms that comprise more than a dozen species of ... More @Wikipedia
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