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Soil-transmitted helminths, primarily Ascaris, Trichuris and hookworm, infect more than 760 million people worldwide. Parasitic diseases represent a social and economic problem in developing countries. Herein, we present a case of ascariasis in a pregnant woman, who was treated with mebendazole for three days without teratogenic effects. It is emphasized the need not to underestimate helminth infections in developed countries and how rapid notification is needed in order to quickly establish a guided therapy especially in pregnant women.