The microbiology of drinking water remains an important worldwide
concern despite modem progress in science and engineering. Countries
that are more technologically advanced have experienced a significant
reduction in water- borne morbidity within the last 100 years: This
reduction has been achieved through the application of effective
technologies for the treatment, disinfec- tion, and distribution of
potable water. However, morbidity resulting from the ingestion of
contaminated water persists globally, and the available ep-
idemiological evidence (Waterborne Diseases in the United States, G. F.
Craun, ed., 1986, CRC Press) demonstrates a dramatic increase in the
number of waterborne outbreaks and individual cases within the United
States since the mid-1960s. In addition, it should also be noted that
the incidence of water- borne outbreaks of unknown etiology and those
caused by "new" pathogens, such as Campylobaeter sp., is also increasing
in the United States. Although it might be debated whether these
increases are real or an artifact resulting from more efficient
reporting, it is clear that waterborne morbidity cannot be ignored in
the industrialized world. More significantly, it represents one of the
most important causes of illness within developing countries. Approxi-
mately one-half the world's population experiences diseases that are the
direct consequence of drinking polluted water. Such illnesses are the
primary cause of infant mortality in many Third World countries.