<prompt> According to the WHO, what is the minimum bacteriological standard for drinking waterAll the samples should not contain coliform organisms3 consecutive samples of water should not contain any coliforms3 coliforms in a 100 ml water1 coliform in a 100 ml water  <response>: A All the samples should not contain coliform organisms All water intended for drinking, E. coli or thermotolerant coliform must not be detectable in any 100 ml sample bacteria 