{ "background": "Childhood wasting remains a critical public health challenge in protracted refugee settings, where poor hygiene practices exacerbate malnutrition. The Dadaab refugee complex presents a complex environment for implementing sustainable health interventions.", "purpose and objectives": "This case study evaluates the implementation and effect of a novel participatory video intervention designed to improve caregiver hygiene knowledge and practices, with the ultimate aim of reducing childhood wasting rates.", "methodology": "A mixed-methods case study was conducted within selected camps. The intervention involved community members in co-producing hygiene education videos. Their effect was assessed using pre- and post-intervention household surveys measuring hygiene behaviours and mid-upper arm circumference (MUAC) in children under five. The primary analysis employed a logistic regression model: $\\logit(P(Wastingi=1)) = \\beta0 + \\beta1 \\cdot Interventioni + \\beta2 \\cdot Xi + \\epsiloni$, where $Xi$ is a vector of covariates, with robust standard errors clustered at the community level.", "findings": "The intervention was associated with a significant improvement in reported handwashing with soap at critical times, increasing from 22% to 47% of observed households. A reduction in the prevalence of childhood wasting was observed in intervention communities, with the odds ratio estimated at 0.62 (95% CI: 0.48, 0.81). Qualitative data highlighted enhanced community agency and knowledge retention as key themes.", "conclusion": "Participatory video shows promise as a culturally resonant tool for improving hygiene and reducing wasting in refugee camp settings, suggesting that community-led visual media can effectively translate health education into practice.", "recommendations": "Integrate participatory video into routine health and nutrition programming in humanitarian contexts. Future interventions should allocate resources for sustained community facilitation and longitudinal impact assessment.", "key words": "participatory video, wasting, hygiene, refugee health, nutrition, Kenya, behaviour change", "contribution statement": "This study provides novel evidence on the