“…As a possible consequence of the fecal contamination of water, certain enteric pathogens-e.g., Salmonella paratyphi B, Salmonella typhimurium, Salmonella typhosa, Shigella flexneri, and Shigella sonnei-may be found in polluted waters (Heukelekian, 1953). However, in view of the limited numbers of enteric pathogens present, as compared to the quantities of nonpathogenic coliforms and enterococci found in contaminated water, the examination of water for microbial pollution involves the use of methods designed to detect the latter types of organisms (Kabler, 1962). Of the techniques available, the coliform density method is the one recommended officially (American Public Health Association, 1965).…”