What is the developmental cycle of the hepatic fluke?

The eggs of the liver fluke, together with the bile, enter the intestines of the host, from there into the external environment. For further development, eggs must fall into the water. In the water, a larva covered with cilia emerges from the egg. She swims, then enters the body of a freshwater pond snail. In his body, the larva turns into a shapeless sac, in which several generations of embryos are formed. That is, at the larval stage, further asexual reproduction occurs. The larvae leave the body of the pond snail and re-enter the water. They actively swim with the help of a tail, settle in the coastal vegetation of the reservoir. They discard the tail, secrete a shell around themselves and turn into a cyst. Pets swallow parasites by eating coastal grass. In their intestines, cysts dissolve, parasites invade the intestinal walls, enter the bloodstream and with the blood flow are carried into the vessels of the liver, penetrate into the bile ducts.

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