Diarrhea is one of the leading causes of death for children under five, killing more than 400,000 children every year.1“Diarrhoeal disease is the third leading cause of death in children under 5 years old and is responsible for killing around 443 832 children every year.” World Health Organization, “Diarrhoeal disease,” 2024. jQuery(‘#footnote_plugin_tooltip_16749_1_1’).tooltip({ tip: ‘#footnote_plugin_tooltip_text_16749_1_1’, tipClass: ‘footnote_tooltip’, effect: ‘fade’, predelay: 0, fadeInSpeed: 200, delay: 400, fadeOutSpeed: 200, position: ‘top right’, relative: true, offset: [10, 10], }); GiveWell has funded several programs to prevent and treat diarrhea, and we recently expanded our work by making a grant to support the implementation and evaluation of WASHmobile in the Democratic Republic of the Congo (DRC) and South Sudan. The program, which was developed by Johns Hopkins University, delivers water treatment supplies and hygiene messaging to households at the highest risk of diarrheal disease. It has shown promising results in randomized controlled trials (RCTs) but hasn’t yet been implemented at scale in the challenging settings where the need is greatest.
In this episode, GiveWell co-founder and CEO Elie Hassenfeld speaks with Senior Program Officer Erin Crossett, who leads GiveWell’s water research subteam, about the grant. They discuss how the program works, what prior research tells us about its potential, the significant uncertainties involved, and what GiveWell expects to learn.
Elie and Erin discuss:
How WASHmobile works: When someone in a household has diarrheal disease, others in the household are at much higher risk. To reduce this risk, WASHmobile first identifies children who have been hospitalized with severe diarrhea. A health worker visits their family to provide handwashing supplies and chlorine tablets to disinfect water, then follows up with phone reminders about safe water practices. Because household members often share the same water source and live in close quarters, treating water and improving hygiene during this critical window can prevent further infections and deaths. Trials of more intensive versions of this program found reductions in diarrheal disease of roughly 60%. Our grant also includes a second, lower-cost component that sends SMS alerts and digital chlorine vouchers to people living near detected outbreaks.
Navigating uncertainty in fragile contexts: WASHmobile is being implemented in South Kivu (DRC) and Jonglei State (South Sudan) by Tearfund, which is partnering closely with the countries’ ministries of health. Because of active armed conflict, severe flooding, and large displaced populations, these areas are challenging for health program implementation. GiveWell is funding a version of the program that is less intensive than the one studied in trials, with shorter duration and less intensive follow-up, and we have discounted