Parasite prevalent areas. Panel 1: GIS map of Kolkata showing the areas with high or low prevalence of Giardia lamblia. Areas such as Rajrhat, Tangra and Tiljala show the highest prevalence of Giardia. Saltlake, Dumdum, Beliaghata etc. also have high prevalences of Giardia. Panel 2: GIS map of Kolkata showing the areas with high or low prevalence of Cryptosporidium sp. The highest prevalence was seen in areas such as Salt Lake, Dumdum, Tangra etc. Panel 3: GIS map of Kolkata showing high prevalence of Entamoeba histolytica in areas such as Dumdum, Beliaghata, Maniktala etc.