Fasciolopsis.docx - Learning Issue: Intestinal Flukes:...

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Learning Issue: Intestinal Flukes: Fasciolopsis Definition Large intestinal fluke: Fasciolopsis buski Flukes aka Intestinal trematodes Trematodes: flat hermaphroditic worms – vary in length from a few millimeters to many centimeters About 70 different species known to colonize the human intestine – but only a few actually cause infection Foodborne transmission Most common: Fasciolopsis buski Other: Heterophyes heterophyes, Metagonimus yokogawai, and Echinostoma species (Echinostoma ilocanum) Etiology Fasciolopsis buski Eggs are shed in stools – hatch in fresh water – followed by infection of snails and release of cercariae – encyst in aquatic plants Humans are infected – eating uncooked plants (water chestnuts, bamboo shoots, and watercress) Mature in about 3 months – live in small intestine attached to mucosa Cause local inflammation/ulceration, and mucous secretion at site of attachment Lead to malabsorption, intestinal opstruction, protein-losing enteropathy, impaired vitamin B12 absorption F buski Attaches to duodenal and jejunal mucosa usually The life cycle of Fasciolopsis. Immature eggs are discharged into the intestine and stool and become embryonated in water. Snail is an intermediate host – where it matures. Then they live on aquatic plants – then eaten by
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Fasciolopsis.docx - Learning Issue: Intestinal Flukes:...

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