RE: Schistosoma haematobium: the blood sucking parasite

I am keen to telling people around me to keep their environment clean. A lot of people do not understand the importance of it or have an idea of they could be infected with when staying in dirty environment with stagnant water. Asides Schistosoma, others like Salmonella and Camphylobacter are always waiting in water for humans. I was in an area some time back when I saw people living in canals neighbored by stagnant water, I started to ask myself how this people survive to the age of thirty?