Fasciola hepatica (liver fluke)

& Fasciolopsis buski (giant intestinal fluke)

Diagnostic Form:

Fasciolopsis buski is commonly called the giant intestinal fluke and is the largest knwon parasitic fluke in humans. The body can be up to 7.5 cm in length and 2.5 cm in width. It is a common parasite of humans and pigs.

shell operculum knob interior fasciolopsis_fasciola

Geographic Prevalence:

The parasite P. hepatica is most prominent in Europe, Africa, Australia, the Americas and Oceania. P. buski is most prominent in East and Central Asia but is endemic in Asia, China, Taiwan, Indo.


Disease It Causes And The Clinical Symptoms:

Most infections, or cases of "fasciolopsiasis" are light and asymptomatic. It is in heavy infections that symptoms such as abdominal pain, anemia, chronic diarrhea, allergic responses, ascites, and toxemia can occur. Worm allergenic metabolites can cause sensitization which can lead to death. Heavy infections can also cause intestinal obstruction.

Location In The Host:

F. hepatica is located in the liver and gall bladder of the host while F. buski is located in the intestines of the host.


Primary Vector:

The snail is the intermediate host. Metacercariae contaminated water plants are infective source/stage ingested by the definitive host (humans and or pigs).


Life Cycle:





Test Recommended For Detection/Diagnosis:

Microscopic identification of F. buski 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 F. hepatica. F. hepatica eggs are best detected in the stool. Ova and parasites examinations are the test of choice. Three specimens over a period of one week are required.