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Drawing of ventral view of Metorchis conjunctus, scale bar is 1 mm
The body of M. conjunctus is pear-shaped and flat. The body length is - inch (6.4-9.5 mm). It has a weakly muscular terminal oral sucker. No prepharynx is present. The pharynx is strongly muscular. The esophagus is very short. The intestinal ceca vary from almost straight to sinuous. The acetabulum is slightly oval and weakly muscular. The male has an anterior testis and a posterior testis. The testes vary from almost round to oval, and may be deeply lobed or slightly indented. No cirrus pouch is found. The seminal vesicle is slender. The ovary is trilobed. The receptaculum seminis is elongated or pyriform, and slightly twisted, and situated to the right and behind the ovary.
After ingestion of fish infected with M. conjunctus, about 1-15 days are needed for symptoms to occur, namely for eggs to be detected in the stool (incubation period).
The acute phase consists of upper abdominal pain and low-grade fever. High concentrations of eosinophil granulocytes are in blood. Also, higher concentrations of liver enzymes are seen. When untreated, symptoms may last from 3 days to 4 weeks. Symptoms of chronic infection were not reported.
^ abcdefghMacLean J. D., Arthur J. R., Ward B. J., Gyorkos T. W., Curtis M. A. & Kokoskin E. (1996). "Common-source outbreak of acute infection due to the North American liver fluke Metorchis conjunctus". The Lancet347(8995): 154-158. doi:10.1016/S0140-6736(96)90342-6