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Deworm the World: 2025 in Review
More than 895 million children globally are at risk for parasitic worm infections, which cause anemia, malnutrition, and impaired cognitive development — leading to missed school days and reduced lifetime earnings. Despite costing only about $0.50 per child per year to treat, many countries lack the technical capacity to deliver high-quality programs at scale.
In 2025, we reached 183 million children across five countries while launching a new partnership in Tanzania.
In Kenya, worm infections have dropped over 80% since we began supporting the national program in 2012 — meaning millions of children now avoid the anemia, malnutrition, and school absenteeism these infections cause. In Nigeria, seven years of partnership in Cross River State helped reduce soil-transmitted helminth prevalence by 49% and schistosomiasis by 75%. Here is what that looks like from the ground:
"After a year, there was improvement. We heard about the boy who always comes last in school. But immediately he took the deworming tablet and he began to come either first or second. Had it been the boy didn't take the drugs, he would have dropped out."
— Oladoyinbo Tunji, Oyo State Coordinator, Neglected Tropical Diseases, Nigeria
For every $1 invested in deworming, we estimate a return of $169 in lifetime earnings for the children treated.
evidenceaction.org/programs/deworm-the-world