|Description:||Magnified 128X, this photomicrograph revealed the presence of a trematode, Fasciola hepatica, or “sheep liver fluke”, egg, which is described as broadly ellipsoidal, operculated, and measure 130µm to 150µm long by 60µm to 90µm wide. The eggs are unembryonated when passed in feces. The eggs of F. hepatica can be difficult to distinguish from Fasciolopsis spp., although the abopercular end of the former often has a roughened or irregular area.|
During the acute phase (caused by the migration of the immature fluke through the hepatic parenchyma), manifestations include abdominal pain, hepatomegaly, fever, vomiting, diarrhea, urticaria and eosinophilia, and can last for months. In the chronic phase (caused by the adult fluke within the bile ducts), the symptoms are more discrete and reflect intermittent biliary obstruction and inflammation. Occasionally, ectopic locations of infection (such as intestinal wall, lungs, subcutaneous tissue, and pharyngeal mucosa) can occur.