UoM Parasitology Lecture 1-4 (Year 2, Sem 2, 2017)

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There are some parasites which also have active free-living versions. Hookworms and schistosomes are examples of these parasites. Order the steps in the schistosome life cycle.

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Cercariae circulate and migrate to portal blood (in liver) maturing into adults

Sporocysts form in the snail

Cercariae released by snail into water

Eggs layed at the sites circulate to the liver and shed in stools

Start - The parasite (S. Haematobium/S. Japonicum/S. Mansoni) was released in the urine or faeces

Cercariae penetrate skin

Eggs hatch releasing miracidia

Cercariae lose tails during penetration to become schistomulae

Paired adult cercariae migrate to mesenteric venules of bowel/rectum or the venous plexus of the bladder

Miracidia penetrate snail tissue


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