In low income countries, diarrhoea among young children is a major cause of death and disease, and is often the result of exposure to human faeces. This review found that in low-income settings, among the estimated 2.6 billion people who lack basic sanitation. The evidence suggests that excreta disposal interventions are effective in preventing diarrhoeal diseases. However, major differences among the studies, including the conditions in which they were conducted and the types of interventions deployed, as well as methodological deficiencies in the studies themselves, makes it impossible to estimate with precision the protective effective of sanitation against diarrhoea.
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