The following table lists the etiologies (cause) of illness associated with drinking water in 1998. Which of the water sample agents would have shown a high coliform count? Which etiologies (agents) could have been detected by membrane filter technique? List four. Which diseases could have been prevented by filtration? give two. EMB plates will not be suitable for which organisms. List all. Solution a) E. coli O157:H7 would have shown a high coliform count, since all others are non-coliforms. b) Any etiologic agent larger than .45uM (pore size of a filter) will be detected in filter technique. The list has E. coli O157:H7, Giardia lambia, Leptospira, Shigella sonnei. Viruses escape the filter. c) Waterborne diseases cause diarrhea (E. coli O157:H7), cholera (Vibrio cholerae) and dysentery (Shigella and Salmonella). d) Except E. coli O157:H7, all others are non-coliforms. Therefore, except this organism, others are not suitable..