 Sometimes we look at this disease as a tropical something and the thing is from sub-Saharan Africa and South America or somewhere, I mean developing country. But we forget to know that it is now everywhere in the world. So a research that was carried out in USA 2005 to 2006, they came out with the conclusion that among this etiologic agents, etiologic agents, they are the diseases that cause water borne, I mean that cause this water borne infection. So we have a legionella, which was 50%, bacteria was causing 10% of the illness, then parasites was also causing 10%. Viruses were causing 15% and 10% was unidentified. And then they also did research on the water system and they found out that the water from the non-community, that is this river, this river like the airport, were having 62%, 62.5% of the disease. And then water from the community were having 12% and individual 25%. And in this water, in this water system, 12.5% of the parasite came from the surface water, the running water, and 87% came from groundwater.