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cercariae

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Cercariae
The free-living form of the schistosome worm that has a tail, swims, and has suckers on its head for penetration into a host.
Mentioned in: Schistosomiasis

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Inside the snail, within several weeks, the miracidium transforms into cercariae.
Even the cercariae of schistosomes parasitic to birds and animals will often try to penetrate human skin, causing the conditior.
The cercariae penetrate under the scales of a susceptible fish, which serves as the second intermediate host; they encyst as metacercaria, mainly in the fish body muscles.
 
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