Diarrhoea is a common illness among persons in the community in Australia, Canada, Ireland, and the United States. With similar methodologies and a standard case definition, age and sex patterns and health care seeking behaviour were remarkably consistent between countries.

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Providing safe water to .1 billion people in need is a major challenge. To address this need, the Safe Water System (SWS) -household water treatment with dilute bleach, safe water storage, and behavior change -has been implemented in .20 countries. To assess the potential sustainability of the SWS, we analyzed costs in Zambia of "Clorin" brand product sold in bottles sufficient for a month of water treatment at a price of $0.09. We analyzed production, marketing, distribution, and overhead costs of Clorin before and after sales reached nationwide scale, and A sensitivity analysis showed that if the bottle price increased to $0.18, the project would be self-sustaining at maximum capacity. This analysis demonstrated that efficiencies in the SWS supply chain can be achieved through social marketing. Even with a subsidy, overall program costs per beneficiary are low.

The Centers for Disease Control and Prevention's Environmental Public Health Tracking (EPHT) Program has funded multiple partners to develop a nationwide surveillance system that focuses on the environment and its impact on human health. To show that investing in a nationwide EPHT Network is a sound practice, the program must demonstrate that monetized improvements to the public's health due to tracking outweigh the costs. In the process of developing capacity for the EPHT Network, programs have had a positive impact on the public health. Results from successful programs can be used to estimate financial measures of the EPHT performance, such as net present value, return on investment, and payback period. The estimation of such measures for the EPHT requires an understanding of the economic elements for analysis in the context of surveillance systems. A quantitative assessment must take into account elements that are difficult to measure and value. By performing a return on investment, a financial measure of program performance, the expected costs and potential benefits of individual projects need to be assessed and compared with the current cost burden of the health condition.