Cholera should not exist at the scale it does in 2026. It is preventable. It is treatable. Yet it continues to move through communities across Sub-Saharan Africa with a consistency that points not to a failure of medicine but to a failure of systems.
The Kenya 2022 Demographic and Health Survey (DHS) offers one of the clearest datasets for examining why. Drawing on it, the PBHI Research Study is building an evidence base around a simple question: who bears the highest risk, and what structural conditions explain it?
The structural logic of cholera risk
Cholera does not spread evenly. It follows infrastructure, or more precisely, the absence of it. Communities without reliable access to clean water, improved sanitation, and basic hygiene resources are placed, by structural design, close to the conditions that allow cholera to spread.
In DHS methodology, the wealth quintile is more than a measure of income. It is a proxy for living conditions, service access, and environmental exposure. Layered against WASH indicators, the pattern is clear: poorer households are more likely to depend on unimproved water sources, share sanitation facilities across several families, and lack handwashing resources. These deficits compound each other, so vulnerability becomes cumulative.
What the Kenya data makes possible
DHS-based research moves the analysis beyond national averages, which can hide more than they reveal, into the specific geographic and socioeconomic clusters where risk is concentrated. In Kenya, rural communities and informal urban settlements carry a disproportionate share of infrastructure gaps, and these become acute during rainy seasons when flooding spreads contaminated water.
From evidence to intervention
The study aims to turn statistical patterns into practical guidance. If cholera risk is most concentrated among rural households in the lowest wealth quintiles with limited sanitation, then community-led total sanitation, subsidised water infrastructure, and targeted hygiene campaigns become evidence-backed priorities. That gives policymakers and health organisations a basis to direct resources where need is greatest, not where it is most visible.
Building research capacity
The study is also developing the analytical and writing skills of the next generation of African public health professionals. Working with DHS data, reviewing literature, running statistical analysis, and preparing a manuscript for peer review are part of the point. African health systems need both better policies and professionals who can generate the evidence behind them.
Clean water and improved sanitation are not development luxuries. They are public health infrastructure.
PBHI Research Study, Kenya 2022 DHS, Community Health and WASH. First published on LinkedIn.
