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Ascaris suum is a common nematode (Nematoda, Ascarida, Ascaridae) in the small intestine of pigs. 猪蛔虫(Ascaris suum)属于线虫纲（Nematoda）蛔目（Ascarida）蛔科（Ascaridae），寄生于猪小肠，可导致猪的腹泻、消瘦、贫血、出血、生长不良，并易引起其它疾病的继发。