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PARASITE REX:
Inside the Bizarre World
of Nature's Most
Dangerous Creatures

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Schistosoma (also known as the blood fluke) infects over 200 million people. Its eggs hatch in fresh and the young parasite seeks out a snail. Inside the snail, the parasite passes through several generations before producing a missile-shaped stage called a cercaria. The cercaria then penetrates human skin and becomes an adult, which finally ends in the veins of its human host.


Photograph courtesy of Ming Wong

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