Chapter One — 1.1 Background to the Study

Water, Sanitation and Hygiene (WASH) Interventions has increasingly attracted the attention of researchers, regulators, and practitioners concerned with vaccination uptake. This growing interest reflects the recognition that water, sanitation and hygiene (WASH) interventions does not operate in isolation, but interacts with a wider set of institutional and market conditions found within Oyo State.

Oyo State presents a useful setting for examining this relationship precisely because the conditions there — structural, regulatory, and behavioural — differ from those typically assumed in the broader literature, most of which draws on evidence from more developed economies.

1.2 Statement of the Problem

Despite a growing body of literature on water, sanitation and hygiene (WASH) interventions, there remains limited consensus on the precise nature of its relationship with vaccination uptake, particularly within Oyo State. Many organizations continue to make decisions about water, sanitation and hygiene (WASH) interventions without a clear, evidence-based understanding of how those decisions ultimately affect vaccination uptake. This gap between practice and empirical understanding is the central problem this study seeks to address.

1.3 Objectives of the Study

1. To examine the effect of Water, Sanitation and Hygiene (WASH) Interventions on vaccination uptake in Oyo State.
2. To assess the extent to which water, sanitation and hygiene (WASH) interventions influences vaccination uptake within the study area.
3. To identify the challenges associated with water, sanitation and hygiene (WASH) interventions in relation to vaccination uptake.
4. To recommend strategies for optimizing water, sanitation and hygiene (WASH) interventions in order to improve vaccination uptake.

1.4 Research Questions

1. What is the effect of water, sanitation and hygiene (WASH) interventions on vaccination uptake in Oyo State?
2. To what extent does water, sanitation and hygiene (WASH) interventions influence vaccination uptake within the study area?
3. What challenges are associated with water, sanitation and hygiene (WASH) interventions in relation to vaccination uptake?
4. What strategies can be adopted to optimize water, sanitation and hygiene (WASH) interventions in order to improve vaccination uptake?

1.5 Significance of the Study

Beyond its academic contribution to the field of public health, this study has practical value for management teams within Oyo State seeking to understand how water, sanitation and hygiene (WASH) interventions translates into measurable outcomes around vaccination uptake. It is equally useful to students and future researchers looking for a localized empirical reference on this relationship.

1.6 Scope of the Study

In terms of scope, this study confines itself to Oyo State, focusing specifically on how water, sanitation and hygiene (WASH) interventions relates to vaccination uptake within that setting. Findings are interpreted within these boundaries rather than as universal claims applicable to every organization or market.