Water, Sanitation, and Hygiene (WASH) Gaps as Drivers of Antimicrobial Resistance in Sub-Saharan Africa: A One Health Perspective

Antimicrobial resistance (AMR) is a growing global threat, and sub-Saharan Africa (SSA) bears a disproportionate share of this burden. This narrative review examines how deficiencies in water, sanitation, and hygiene (WASH) contribute to AMR in SSA. It draws on peer-reviewed literature, institutional reports, and regional policy documents published between 2015 and 2025. Sources were identified through databases such as PubMed, Google Scholar, and WHO/UN databases using combinations of keywords including ‘AMR’, ‘WASH’, ‘Sub-Saharan Africa’, and ‘One Health’. We survey recent literature on the regional AMR problem, the role of inadequate WASH in propagating resistant infections among humans, animals, and the environment, and the relevance of a One Health approach. Key themes include the high AMR mortality in Africa, the persistence of antibiotic residues and pathogens in poorly managed water and sanitation systems, and how poverty-related WASH gaps drive frequent infections that require antibiotics. Evidence suggests that unsafe water and sanitation facilitate the environmental circulation of resistant bacteria and genes. The One Health framework is highlighted as essential for addressing these links, since AMR crosses human, animal, and ecological domains. We conclude that improving WASH infrastructure and practices, alongside integrated AMR strategies, is critical to curb resistance in the region. Focusing on WASH under a One Health perspective can reveal overlooked pathways of AMR spread and inform targeted interventions in SSA.