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Infections caused by nematode larvae which never develop into the adult stage and migrate through various body tissues. They commonly infect the skin, eyes, and viscera in man. Ancylostoma brasiliensis causes cutaneous larva migrans. Toxocara causes visceral larva migrans.

Creeping eruption, a progressing circumscribed line dermatitis caused by the burrowing in the skin the minute larva of a species of Gastrophilus bot-fly.