A Commons projekt szabad licencű kép- és multimédiatár.
Segíts te schistosomiasis cdc az építésében! LeírásSchistosomiasis Life Cycle.
Under optimal conditions the eggs hatch and release miracidia 2which swim and penetrate specific snail intermediate hosts 3. The stages in the snail include 2 generations of sporocysts 4 and the production of cercariae 5.
Upon release from the snail, the infective cercariae swim, penetrate the skin of the human host 6and shed their forked tail, becoming schistosomulae 7. The schistosomulae migrate through several tissues and stages to their residence in the veins 8,9.
Adult worms in humans reside in the mesenteric venules in various locations, which at times seem to be specific for each species For instance, S. However, both species can occupy either location, and they are capable of moving between sites, so it is not possible to state unequivocally that one species only occurs in one location.
The females size 7 to 20 mm; males slightly smaller deposit eggs in the small venules of the portal and perivesical systems. The eggs are moved progressively toward the lumen of the intestine S.