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The bilharzia, Schistosoma haematobium, is a parasite flatworm and an example of a Successful parasite. It completes its life cycle in two hosts. The male and female adults live in the blood of humans while larval forms live in 'the bodies of a type of snail, Bulinus africanus. The adult poses suckers with which they attach themselves to the waifs of blood vessels. Their bodies are covered with thick cuticles.
When mature, adults meet in the blood of man. The male and female become 'associated' in fiat the slightly broader male rolls its body into a tube in which the long, thin female lives. When the female is ready to lay eggs she frees herself and moves into small bipod vessels in the wall of the bladder. There she lays eggs.
When the egg comes into contact with the water, its shell breaks and a ciliated larva, called a miracidium, is released. If it comes in contact with a host it works itself into the body of the snail by means of hydrolysis. Sporocysts are produced by the miracidium, Cercariae are produced after several generations of sporocysts. The cercariae make their way into the water arid make contact with a human. There it comes into the blood stream and live their. Within six to twelve weeks the larvae develop into adults and the cycle is reported once more.
francis1897 answered the question on February 28, 2023 at 07:54
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