Because of the differences in the type of sources, the nature of the pathogens and their geographical prevalence, various research and policy approaches have been taken by different regulatory bodies. Using Legionellosis as an example, guidelines and regulations are available from various government agencies, cooling tower manufacturers and industrial trade organisations to control and prevent the growth and dispersal of these particular pathogens. Although guidelines and regulations are widely known and implemented, outbreaks of Legionnaire's disease are not uncommon. Some studies report that the pathogens can travel up to 12 km from the suspected source and still cause infections [8] , thus indicating a more complicated relationship between source and disease transmission than was previously understood.