Burden of disease attributable to unsafe drinking water, sanitation, and hygiene: 2019 update presents estimates of the burden of disease attributable to unsafe drinking water, sanitation and hygiene for 183 WHO Member States disaggregated by region, age and sex for the year 2019. The estimates are based on four health outcomes - diarrhoea, acute respiratory infections, undernutrition, and soil-transmitted helminthiases.