Fasciolopsis buski
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Causal Agent: The trematode Fasciolopsis buski, the largest intestinal fluke of humans.
Life cycle of Fasciolopsis buski
Immature eggs are discharged into the intestine and stool . Eggs become embryonated in water , eggs release miracidia , which invade a suitable snail intermediate host . In the snail the parasites undergo several developmental stages (sporocysts , rediae , and cercariae ). The cercariae are released from the snail and encyst as metacercariae on aquatic plants . The mammalian hosts become infected by ingesting metacercariae on the aquatic plants. After ingestion, the metacercariae excyst in the duodenum and attach to the intestinal wall. There they develop into adult flukes (20 to 75 mm by 8 to 20 mm) in approximately 3 months, attached to the intestinal wall of the mammalian hosts (humans and pigs) . The adults have a life span of about one year.
Geographic Distribution:
Asia and the Indian subcontinent, especially in areas where humans raise pigs and consume freshwater plants.
ID#: 1538 Description: Egg of Fasciolopsis buski.
Content Providers(s): CDC/Dr. Mae Melvin Creation Date: 1979
Copyright Restrictions: None - This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image.
Drawing of entire specimen of Fasciolopsis buski (Digenea: Fasciolidae). a – oral sucker, b – acetabulum (ventral sucker), c – cirrus pouch, d – vitelline glands, e – “shell-glands”, f and g – posterior and anteroir testicles, h – ovary, i – cecum, k – uterus.