Male and female adult live
within blood vessels the human
intestines. The release eggs
that trespass vessel walls and enter
intestinal lumen being eliminated
the human feces. When water
the eggreleases a called
miracidium that then to reach the
snail is the intermediate host.
the snail miracidia transform
cercariae, another kind of
larva. The cercariae leave snail and
swim until through the
human skin. humans the cercaria
gains circulation infecting mainly the
vessels of the intestines, or
lungs and develops the adult form
of parasite.