Fig. 3
Environmental measures to limit transmission sources of schistosomiasis and soil-transmitted helminthiasis in China (a Environmental modification performed by cementing along both sides of a canal where was the habitat of Oncomelania snails; b Safe water provided to each household by subsidy programmes from local government; c This new village latrine was built in a hyper-endemic village of schistosomiasis; d New irrigation system being built in farmland that was the habitat of Oncomelania snails; e The diagram of bio-gas chambers for faecal fermentation to eliminate eggs of schistosomes; f A housewife is cooking a meal in her kitchen room with the energy supplied by bio-gas transferred by a tube connected to the faecal fermentation chambers)