The trematode Fasciolopsis buski, the largest intestinal fluke of humans. The  adults have a life span of about one year.

Symptoms

Most infections are light and asymptomatic.  In heavier infections, symptoms include diarrhea, abdominal pain, fever, ascites, anasarca and intestinal obstruction.

Diagnosis

Microscopic identification of eggs, or more rarely of the adult flukes, in the stool or vomitus is the basis of specific diagnosis.  The eggs are indistinguishable from those of Fasciola hepatica.

Treatment

Praziquantel is the drug of choice.

References

CDC