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Disease caused by the trematode helminthes constitute Trematodiasis


Schistosomiasis is caused by the parasitic infection of flukes of three species namely Schistosoma manosoni, S.japonicum, S. haemotobium. The flukes cause dysentery and liver diseases followed by fever, sweating, diarrhoea, weightloss and lack of appetite. Intestinal Schistosomiasis is caused by S.mansoni , urinogenital Schistosomiasis is caused by S. haemotobium. The larva of the worm penetrates the skin of man.  Through the blood circulation it reaches the lungs to become adult flukes.


Opisthorchiasis is caused by the parasite Opisthorchis sinensis (Chinese liver fluke).  Human infection is acquired by eating raw or undercooked fish which harbour the larva of the parasite.  When human host eat the fish the larvae emerge in the duodenum, enter the common bile duct and mature in the distal bile ducts to an adult fluke. Patients with Opisthorchiasis may die due to variety of complications including biliary obstructions and pancreatitis.


Paragonimiasis is caused by an infection of the lung fluke, Paragonimus westermani. Adult flukes live in the respiratory tract of man. Human host acquire the infection by eating raw or under cooked infected crustaceans. The lung fluke cause chronic cough with recurring attacks of haemoptysis, night sweats severe chest pain and pleural effusions are common.


Fasciolopsiasis is caused by Fasciolopsis buski, the giant intestinal fluke. The adult worm lives in the small intestine of man and pig. The intermediate host is snail. Man acquires the infection of Fasciolopsiasis by eating uncooked aquatic vegetables. The flukes attached to the duodenal and jejunal wall. The point of attachment may ulcerate and get infected.


Fascioliasis is caused by Fasciola hepatica, the sheep liver fluke. Human may acquire the infection where ever sheep are raised. The adult fluke live in hepatic bile ducts later penetrate in to the liver where they feed on the parenchymal cells of the liver. Severe untreated infection may become fatal.
Diagnostic Procedures | Helminths | Introduction to parasitology | Medical Parasitology | Protozoology