detection of giardia cysts and cryptosporidium oocysts in drinking water surface suppliers, befor and after treatment in hamadan

introduction: giardia and cryptosporidium are two of the most common parasitic protozoa that cause acute intestinal infections in children, all of the world. these parsites find in water environments, such as untreated water , wastewaters and even treated water. according to, a precise study on surface water was not done, in our country, necessity of precise study by ifa method that is prescise and newer than simple microscopic method on drinking water supplies aim to finding of parasit, is appreciated. material and methos: using ifa and eosin stainig methods, untreated water, water of main refinery system and water of six hamadan drinking water reserviour was studied and data analysis was done by: spss version 10 © 2005 chicago. finding: means of giardia cysts and cryptosporidium oocysts, stainined with ifa method, in 100l treated water for each one was 0.25 and in 100l untreated water were respectively 2.5 and 1.5 measure of viable giardia cysts and viable cryptosporidium oocysts were seen with eosin method, in 100l treated water for each one was 0.0 and in 100l untreated water were respectively 0.5 and 0.1. discussion: finding show that hamadan main source of untreated water have giardia cysts and cryptosporidium oocysts higher than standard measure (for giardia and cryptosporidium is respectively 0.1 and 0.01 in 100l) and pollution is sensible. viable cysts or oocysts in one of refinery system's port were not seen and in another system, 1 nonviable cyst were seen, but, in urban water reserviours, five zone have both parasits and one of them have 1 giardia cyst only, that indicate secondary pollution of urban water reserviours.