During the survey, the Kato-Katz technique and the miracidium
hatching test were used for fecal examination.
The eggs hatch in water and release a free-swimming miracidium
, whose objective in life is to find and penetrate an appropriate snail in which to develop.
Within 30 to 45 days, miracidium
grows into worm, which can lay 200 to 2,000 eggs per day for an average of 5 years.
Once inside the snail host, each miracidium
develops a "sporocyst," which may divide and produce other sporocysts.
Praziquantel only kills adult worms and does not inactivate schistosomules, nor the miracidium
inside the eggs, which will continue to elicit a damaging immunologic response for some time.