Figure 4
From: The roles of water, sanitation and hygiene in reducing schistosomiasis: a review
Flow diagram demonstrating how sanitation may increase or decrease cercarial production depending on the setting. Reducing snails’ exposure to miracidia may reduce the number of snails infected and shedding cercariae, or under certain circumstances, by reducing the number of miracidia infecting each snail, it may increase snail longevity and cercarial output. Which effect is stronger depends on how frequently snails encounter miracidia, which varies between settings.