Effects of a Water, Sanitation, and Hygiene Program on Diarrhea and Child Growth in the Democratic Republic of the Congo: A Cluster-Randomized Controlled Trial of the Preventative-Intervention-for-Cholera-for-7-Days (PICHA7) Program

BackgroundWe assessed whether the Preventative-Intervention-for-Cholera-for-7-Days (PICHA7) program reduced diarrhea and improved child growth in the Democratic Republic of the Congo (DRC). MethodsThe PICHA7 cluster-randomized controlled trial enrolled diarrhea patient households in urban Bukavu, DRC. Households were randomized into two arms: single in-person visit for the DRC governments diarrhea patient standard message on oral rehydration solution use and a basic WASH message (standard arm); or this standard message and the PICHA7 program with quarterly in-person visits and weekly voice and text mobile health messages (mHealth) (PICHA7 arm). The primary outcome was diarrhea in the past two weeks assessed monthly for 12 months. Secondary outcomes were diarrhea with rice water stool, healthcare facility visits for diarrhea, stunting, underweight, and wasting over 12 months. Generalized estimating equations were used for regression models to account for clustering at the individual and household level. ResultsBetween December 2021 and December 2022, 2334 participants in 359 households were randomly allocated to two arms: 1138 standard arm and 1196 PICHA7 arm. Diarrhea prevalence during the 12 month surveillance period was significantly lower among PICHA7 arm participants (Prevalence Ratio: 0.39 (95% Confidence Interval (CI): 0.32, 0.48). PICHA7 arm participants had lower odds of diarrhea with rice water stool (Odds Ratio (OR): 0.48 (95% CI: 0.27, 0.86)), and lower odds of visiting a healthcare facility for diarrhea during the 12 month surveillance period (OR: 0.44 (95% CI: 0.25, 0.77)). PICHA7 arm children 0-4 were significantly less likely to be stunted (52% vs. 63% standard arm) (OR: 0.65 (95% CI: 0.43, 0.98)) at the 12 month follow-up. All WASH components had high adherence. ConclusionThe PICHA7 program which combines mHealth with quarterly in-person visits lowered diarrhea prevalence and stunting in the DRC. Clinical Trials RegistrationNCT05166850. Key PointsThe PICHA7 program combines mHealth with in-person visits and was assessed with a randomized controlled trial. Compared to the standard arm, the PICHA7 program lowered diarrhea prevalence for all ages and reduced stunting in children 0-4 years in the DRC.