Hepatitis A and C ); Bacteria (e.g. E-coli , Cholera , Salmonella typhi , Shigella , and some , Cyanobacteria ); Protists or Protozoa (e.g. Giardia , Cryptosporidium , and Entamoeba ); and Helminths (e.g. Ascaris , Dracunculiasis , and other parasitic worms ). As with chemical contaminants each of these