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Effect of Vaccine Stock Availability on Routine Immunization Coverage in Rural Nigeria

Abstract

Routine immunization is one of the most cost-effective public health interventions for preventing childhood morbidity and mortality from vaccine-preventable diseases. However, sustained immunization coverage depends on the continuous availability of appropriate vaccines at healthcare facilities where children receive routine vaccination services. Vaccine stock availability refers to the consistent presence of required vaccines in adequate quantities and appropriate conditions at healthcare facilities to meet the immunization needs of eligible children. Routine immunization coverage refers to the proportion of eligible children who receive recommended vaccines within the appropriate age range and according to the national immunization schedule. In rural Nigeria, vaccine stock-outs and interruptions in vaccine supply may contribute to missed vaccination opportunities, delayed doses, incomplete vaccination schedules, and reduced immunization coverage. Challenges affecting vaccine availability may include inadequate forecasting and quantification, procurement delays, transportation difficulties, cold-chain challenges, inadequate storage capacity, funding constraints, power-supply problems, and weaknesses in vaccine distribution and inventory management. Consistent vaccine availability may improve routine immunization coverage by ensuring that eligible children can receive vaccines whenever they present for services and reducing the need for caregivers to make repeated visits to health facilities. Against this background, this study investigates the effect of vaccine stock availability on routine immunization coverage in rural Nigeria. The study is anchored on Donabedian's Structure-Process-Outcome Model, the Health Systems Framework, and the Andersen Behavioral Model of Health Services Use. Donabedian's Model identifies the availability of essential healthcare resources, including vaccines, equipment, and infrastructure, as structural factors that influence healthcare processes and outcomes. The Health Systems Framework recognizes access to essential medicines and health technologies, service delivery, health workforce, health information, and health-system financing as fundamental components of effective healthcare delivery. The Andersen Behavioral Model explains healthcare utilization through predisposing, enabling, and need-related factors, providing a basis for understanding how the availability of vaccination services may influence their utilization by caregivers. Collectively, these theoretical perspectives provide a suitable framework for explaining how vaccine stock availability may influence routine immunization coverage in rural Nigeria. The study will adopt a quantitative cross-sectional research design. Data will be collected from selected rural primary healthcare centres using vaccine stock assessment checklists, immunization registers, vaccine stock cards, logistics management records, facility immunization reports, cold-chain monitoring records, and structured questionnaires for healthcare workers and parents or caregivers where appropriate. A multistage sampling technique will be employed to select states, local government areas, rural communities, primary healthcare centres, and eligible children. Vaccine stock availability will be assessed using indicators such as availability of recommended routine vaccines, frequency and duration of vaccine stock-outs, adequacy of vaccine quantities, consistency of vaccine supply, vaccine stock-management practices, availability of functional cold-chain equipment, vaccine storage conditions, stock-record accuracy, frequency of resupply, and availability of essential immunization supplies. Routine immunization coverage will be assessed using indicators such as the proportion of eligible children receiving age-appropriate vaccines, vaccination completion rates, coverage of selected routine childhood vaccines, dropout between vaccine doses, and vaccination status verified through immunization cards and facility registers. Where possible, vaccine stock records will be compared with immunization registers and facility reports to establish the relationship between vaccine availability and vaccination performance. Descriptive statistics will be used to summarize vaccine stock availability and routine immunization coverage. Inferential statistical techniques, including chi-square tests, correlation analysis, and multiple regression analysis, will be used to determine the effect of vaccine stock availability on routine immunization coverage. Diagnostic tests will also be conducted to assess the reliability of research instruments, model assumptions, goodness of fit, multicollinearity, and robustness of the findings. The study is expected to find that consistent vaccine stock availability has a significant positive effect on routine immunization coverage in rural Nigeria. Primary healthcare centres with reliable supplies of routine vaccines are expected to demonstrate higher immunization coverage and lower vaccination dropout rates than facilities experiencing frequent or prolonged vaccine stock-outs. Consistent availability may reduce missed opportunities for vaccination by allowing eligible children to receive recommended vaccines when they visit health facilities. It may also reduce the need for caregivers to return repeatedly to facilities because a particular vaccine is unavailable. Reliable vaccine supply, combined with functional cold-chain systems and effective stock management, is expected to strengthen continuity of immunization services and improve the completion of childhood vaccination schedules. Conversely, vaccine stock-outs may result in missed vaccination opportunities, delayed doses, incomplete vaccination schedules, and lower routine immunization coverage. However, vaccine availability alone may not fully determine immunization coverage because caregiver awareness, distance to healthcare facilities, health-worker availability, community attitudes, service reliability, security conditions, socioeconomic factors, and immunization demand may also influence vaccination uptake. Therefore, improving vaccine availability should form part of a broader strategy for strengthening routine immunization services. The study is expected to contribute to the literature on vaccine stock availability, routine immunization coverage, childhood vaccination, vaccine supply chains, primary healthcare, maternal and child health, epidemiology, and public health in Nigeria by providing empirical evidence on the importance of reliable vaccine supplies in achieving high immunization coverage. The findings will provide useful information to the Federal Ministry of Health and Social Welfare, National Primary Health Care Development Agency, National Primary Health Care Development Agency immunization programmes, state ministries of health, state primary healthcare development agencies, local government health authorities, healthcare facility managers, immunization programme officers, development partners, and policymakers regarding strategies for improving vaccine availability. The study will also provide evidence-based recommendations for strengthening vaccine forecasting and quantification, improving procurement and distribution systems, reducing vaccine stock-outs, strengthening cold-chain infrastructure, improving vaccine inventory management, ensuring timely resupply, strengthening stock monitoring, and integrating vaccine supply-chain improvements with community mobilization and routine immunization activities to improve vaccination coverage in rural Nigeria.

Keywords: Vaccine stock availability, routine immunization coverage, rural Nigeria, childhood immunization, vaccine stock-outs, vaccine supply chain, primary healthcare, vaccination coverage, maternal and child health, immunization services, epidemiology, public health.