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Deworming Children Summary and Giving Recommendations
The giving recommendations based on this research are the SCI Foundation, Evidence Action’s Deworm the World Initiative (DtWI), The END Fund’s deworming programme and Sightsavers' Deworming Programme.
Please note this page was last updated in 2018. While our overall views remain unchanged, some details may be out of date.
Neglected Tropical Diseases are a group of diseases that affect more than one billion people in developing countries, especially those living in severe poverty and without adequate access to sanitation. Schistosomiasis and soil-transmitted helminthiasis (STHs) are two common and neglected tropical diseases caused by worms. Schistosomiasis is transmitted through water infested by the larvae of a parasitic worm, and affects roughly 206 million people. STHs are transmitted through faeces and soil, and affect 1.5 billion people worldwide. Evidence suggests worms have an effect on children’s development, and that they negatively influence their ability to earn an income and support themselves later in life.
Mass deworming pill distribution is an inexpensive and safe solution to parasitic worms. The pills cost roughly between $0.50 and $1 per person and have no significant side effects. It is therefore cost-effective to distribute the medication to large groups of people, rather than testing to identify only those who are affected by the illness.
There is strong evidence that deworming reduces the number of worms in people treated. A series of experiments conducted in Kenya also suggests deworming has a significant impact on the income of adults who benefitted from deworming as children. This evidence on income is used to arrive at the cost-effectiveness estimates for the organisations we recommend in this area.
The SCI Foundation supports deworming programmes in 15 countries in Sub-Saharan Africa, with much of their budget devoted to Ethiopia, Malawi, DRC, Nigeria, Madagascar and Tanzania. They support deworming programmes in a variety of ways, including advocating for their implementation, providing funding and medicine to governments, providing advice on financial management, and monitoring and evaluation. It costs roughly $1 to deworm a child through a deworming programme supported by the SCI Foundation. The impact of this could be substantial: GiveWell currently estimates that every $400 invested on average leads to the equivalent of a 10% increase in income for 100 beneficiaries for one year. The SCI Foundation could effectively use up to $19m in additional funding over the next three years, to support the countries it currently works in and extend its operations to other areas where deworming is a health priority.
Evidence Action’s Deworm the World Initiative (DtWI)
DtWI supports deworming programmes in India, Kenya, Ethiopia, Nigeria, Vietnam and Pakistan. It supports programmes run by governments through a variety of activities, such as advocacy, surveys to determine the prevalence of worms in target areas, planning, identifying drugs, running campaigns to make communities aware of the benefits of deworming, training and monitoring, and evaluation. It costs around $0.60 to deworm a child through a programme supported by DtWI, and it currently costs them an estimated average of $200 to produce the equivalent of a 10% increase in income for 100 people for one year. DtWI could productively use $14.7m in the next three years to support additional deworming programmes.
The END Fund’s deworming programme
The END Fund works on a variety of programmes, including supporting deworming programmes for schistosomiasis and STHs. They support deworming programmes by fundraising, identifying gaps in coverage, re-granting funds to other organisations (including the SCI Foundation, DtWI and Sightsavers), and monitoring grantees’ operations. As a result of the indirect nature of their work, we estimate that the END Fund is less cost-effective in producing benefits with marginal funding than the other deworming organisations we recommend. The deworming programmes supported by the END Fund can deliver deworming pills for roughly $0.90 per person. It costs them an estimated $1,200 to produce benefits equivalent to a 10% increase in income for 100 people for one year. They work in a range of African countries, and also in India.
Sightsavers’ Deworming Programme
Sightsavers works on a variety of programmes, with half of their budget devoted to deworming programmes in Cameroon, Guinea, DRC, Nigeria, and Guinea-Bissau. Their work includes: advocating for programmes to be implemented, developing plans, conducting surveys to understand the prevalence of the diseases, training, informing communities about the benefits of deworming, monitoring, and financial support. It costs roughly $0.95 to deworm a child through programmes supported by Sightsavers, and it costs them an estimated $720 to produce benefits equivalent to increasing the income of 100 people by 10% for one year. In the next three years, they could productively use about $1.7 million of additional funding for their deworming programmes.
Anthony Danso‐Appiah et al., “Drugs for Treating Schistosoma Mansoni Infection,” Cochrane Database of Systematic Reviews, no. 2 (2013), Source; A Bennett and H Guyatt, “Reducing Intestinal Nematode Infection: Efficacy of Albendazole and Mebendazole,” Parasitology Today 16, no. 2 (February 1, 2000): 71–77, Source.
Edward Miguel and Michael Kremer, “Worms: Identifying Impacts on Education and Health in the Presence of Treatment Externalities,” Econometrica 72, no. 1 (2004): 159–217, Source; Sarah Baird et al., “Worms at Work: Long-Run Impacts of a Child Health Investment,” The Quarterly Journal of Economics 131, no. 4 (2016): 1637–1680.
WHO, ‘Fact sheet on schistosomiasis’ (Feb 2018)
WHO, ‘Fact sheet on soil-transmitted helminth infections’ (Feb 2018)
WHO, ‘Neglected Tropical Diseases’ (accessed December 2018)