Childhood Immunization Coverage in Kano State, Nigeria
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Abstract
About This Research Topic
Vaccines rank among the most effective tools medicine has ever produced, capable of preventing millions of childhood deaths every year. Yet in Kano State, Nigeria's most populous state, a large share of children still miss out on the full course of routine vaccinations, and the gap between rural and urban households remains wide. Understanding exactly where and why that gap persists is the difference between a vaccination programme that guesses and one that targets its resources where they matter most.
This article draws on a statistical study of childhood immunization coverage in Kano Municipal (urban) and Kura (rural) Local Government Areas, examining coverage rates for each vaccine, dropout patterns, and the household factors that most strongly predict whether a child gets fully immunized. For readers curious how research like this is built from the ground up, our sample research projects library includes comparable statistical and public health studies worth reviewing as models.
The findings matter well beyond the two Local Government Areas studied. They speak to a much larger question facing Nigeria's north-west zone and, by extension, the country's chances of reaching its 90 percent immunization coverage target. The sections that follow set out the background to the problem, the study's approach, and what its results suggest for closing the immunization gap.
Main Abstract
Immunization ranks among history's most cost-effective public health interventions, with the potential to prevent 4 to 5 million deaths every year from diseases that vaccines can stop. Yet Nigeria remains one of the countries with the highest number of unimmunized children in the world, and within Nigeria, the north-west zone, including Kano State, records some of the lowest coverage rates nationally. This study set out to statistically analyse childhood immunization coverage across rural and urban communities in Kano State, pinpointing which vaccines are most under-administered, how wide the rural-urban gap runs, and which household-level factors best explain why some children complete their full immunization schedule and others do not.
Using a cross-sectional, community-based design and three-stage cluster sampling, the study collected data from 388 children aged 12 to 23 months and their mothers or caregivers, drawn from Kano Municipal LGA (urban) and Kura LGA (rural) between January and March 2024. Immunization status was confirmed through vaccination cards where available, supplemented by maternal recall. Coverage was calculated for all eight antigens in the WHO Expanded Programme on Immunisation schedule, and logistic regression was applied to identify which factors independently predicted full immunization.
Overall full immunization coverage came to 48.9 percent, with a striking 22.5 percentage point gap between urban children (61.7 percent) and rural children (39.1 percent). BCG had the highest coverage of any single antigen at 91.7 percent, while Meningitis C trailed at 54.2 percent. The DPT/Penta series dropout rate reached 23.3 percent, more than double the WHO's recommended ceiling of 10 percent. Chi-square testing confirmed statistically significant links between full immunization and maternal education, distance to the nearest primary health care facility, household wealth, and LGA of residence.
Logistic regression identified maternal knowledge of the vaccination schedule as the single strongest predictor of full immunization, followed by maternal education, household wealth, and distance to the nearest health facility. Urban residence remained significant even after adjusting for these other factors, while maternal age dropped out as a meaningful predictor once other variables were controlled for. The resulting model performed strongly, correctly classifying immunization status in the large majority of cases.
Based on these findings, the study recommends stepped-up mobile vaccination outreach for communities more than 5 kilometres from a health facility, community mobilisation through religious leaders, structured prenatal education on the vaccination schedule delivered by community health workers, solar-powered cold chain equipment for rural facilities, and active follow-up of children who miss scheduled doses. Together, these measures target the specific determinants the study identified and offer a realistic path toward Kano State's 90 percent coverage goal.
Chapter One Preview
Background to the Study
Immunization is one of the most transformative interventions in the history of medicine. It eradicated smallpox in 1980, brought poliomyelitis to the edge of elimination, and cut global measles deaths from an estimated 2.6 million a year in 1980 to roughly 128,000 by 2021. Alongside these achievements, vaccines have prevented untold cases of diphtheria, pertussis, tetanus, and other childhood diseases, making immunization arguably the single most effective public health tool ever deployed, as the World Health Organization continues to document.
The Expanded Programme on Immunisation, launched by the World Health Organization in 1974 to protect children against six core diseases, has grown over five decades to cover many more conditions, including hepatitis B, Haemophilus influenzae type b, HPV, rotavirus, pneumococcal disease, and meningococcal disease. In Nigeria and other low- and middle-income countries, the core EPI schedule now covers eight antigens: BCG at birth, three doses each of OPV and DPT/Penta given at 6, 10, and 14 weeks, and Measles, Yellow Fever, and Meningitis C vaccines given at 9 months.
Despite these gains, global progress has stalled and, in places, gone into reverse. An estimated 20.5 million children under one missed their third dose of the DTP vaccine in 2022, a key marker of how well immunization systems are reaching children, and 1.7 million more than in 2019. Much of this backslide traces to the COVID-19 pandemic's disruption of routine health services, with the deepest and most lasting effects felt in sub-Saharan Africa and South Asia.
Nigeria presents one of the toughest immunization landscapes anywhere. With more than 220 million people and a fertility rate near 5.3 births per woman, the country adds roughly 7 to 8 million new births every year, each one a child who needs a full course of vaccines. According to the 2021 Multiple Indicator Cluster Survey and National Immunization Coverage Survey, only around 35 percent of Nigerian children aged 12 to 23 months had received all eight EPI antigens, meaning millions of children each year remain incompletely protected against preventable disease.
The geographic spread of this gap is deeply uneven. The south-east and south-south zones post relatively strong full immunization rates, in the range of 55 to 68 percent, while the north-west zone, home to Kano, Kaduna, Katsina, Kebbi, Sokoto, Zamfara, and Jigawa States, trails well behind at around 19 percent, one of the lowest regional rates anywhere in sub-Saharan Africa. Kano State itself, despite being Nigeria's most populous state with over 13 million residents, sits at an estimated 18 to 22 percent full immunization coverage, with considerable variation between its urban core and rural periphery.
The human toll of this gap is real and measurable. Nigeria accounted for roughly 43 percent of global measles deaths among children under five in 2022. Meningococcal meningitis has periodically swept through communities in the African meningitis belt that includes northern Nigeria, while neonatal tetanus, yellow fever, and pertussis continue to claim lives in under-vaccinated communities. These diseases fall hardest on children from the poorest and most marginalised families, those living furthest from health facilities and whose mothers have had the least schooling.
The reasons behind low coverage in northern Nigeria are layered and interacting. On the demand side, low maternal education, vaccine hesitancy linked partly to the 2003 to 2004 OPV boycott in northern states, cultural and religious beliefs, and high fertility all play a role. On the supply side, weak cold chain infrastructure, frequent stock-outs, too few trained vaccinators, and patchy outreach to communities beyond walking distance of a health facility all limit reach. Structural barriers, including poverty, poor roads, long distances to care, and limited female mobility in conservative communities, compound the problem further.
Kano State has been the target of several improvement efforts over the past decade, including the Reaching Every Ward strategy, the Gates Foundation-backed Leadership Development for Better Immunisation programme, and UNICEF-supported mobilisation through traditional and religious leaders. Despite this investment, coverage remains well below the 90 percent target, and the urban-rural gap within the state has stayed wide and poorly documented at the household level, a gap this kind of statistical fieldwork, the sort our statistics department project archive showcases, is specifically designed to close.
Statement of the Problem
Despite years of multi-partner investment in strengthening Kano State's immunization system, full childhood immunization coverage remains far below the national 90 percent target and continues to show sharp, persistent urban-rural disparities. The most recent national survey data puts full immunization coverage in the north-west zone at around 19 percent, meaning roughly 80 percent of children in the region remain incompletely immunized.
A core problem for programme managers in Kano State is the lack of detailed, household-level statistical evidence on exactly which sociodemographic and structural factors drive immunization non-completion across the state's urban-rural spectrum. National survey data is useful for tracking broad trends, but it does not offer the Local Government Area or community-level detail needed to design targeted outreach or allocate limited resources effectively. Without knowing which communities, which groups, and which specific barriers explain the coverage gap, programme managers cannot direct interventions to where they are needed most.
On top of this, existing studies on immunization determinants in northern Nigeria have rarely combined antigen-specific coverage analysis, dropout rate calculation, and logistic regression modelling of full immunization determinants within a single, integrated framework applied to household-level data from Kano State. The contrast between urban Kano Municipal and rural Kura offers a natural comparison for isolating exactly what the urban-rural divide contributes to coverage gaps and what drives it.
Aim and Objectives of the Study
The aim of this study is to conduct a comprehensive statistical analysis of childhood immunization coverage in Kano Municipal (urban) and Kura (rural) Local Government Areas of Kano State, and to identify the sociodemographic and structural determinants of full immunization completion among children aged 12 to 23 months.
Specifically, the study seeks to:
● Assess antigen-specific immunization coverage rates for all eight EPI antigens among children aged 12 to 23 months in Kano Municipal and Kura LGAs.
● Compute and interpret the DPT/Penta series dropout rate and compare it against the WHO programme performance threshold of 10 percent.
● Determine the overall full immunization coverage rate and quantify the rural-urban coverage disparity.
● Examine bivariate associations between household-level sociodemographic and structural variables and full immunization status using chi-square tests.
● Develop a binary logistic regression model identifying independent determinants of full immunization coverage.
● Compare observed coverage rates with national survey state and national benchmark estimates.
● Make evidence-based recommendations for targeted immunization programme improvements in Kano State.
Research Questions
The study is guided by the following research questions:
● What are the antigen-specific and full immunization coverage rates among children aged 12 to 23 months in Kano Municipal and Kura LGAs?
● What is the DPT/Penta series dropout rate, and does it exceed the WHO threshold of 10 percent?
● Is there a statistically significant difference in full immunization coverage between urban (Kano Municipal) and rural (Kura) children?
● Which maternal, household, and structural factors are significantly associated with full immunization status?
● Which factors independently predict full immunization coverage after controlling for confounding variables?
Significance of the Study
This study offers value at several levels. For programme managers within Kano State's Primary Health Care Management Board, it provides Local Government Area-specific, household-level evidence on coverage gaps and their drivers, allowing outreach resources to be directed rationally toward the communities and groups that need them most. The antigen-specific coverage analysis and dropout rate findings show exactly where in the vaccination schedule children are being lost, pointing toward specific process fixes.
On the policy side, the findings strengthen the evidence base behind Kano State's immunization strategic plan and support advocacy for increased domestic immunization funding. The determinant analysis also offers practical guidance for designing community mobilisation and demand-generation campaigns grounded in what actually predicts non-completion.
Academically, the study adds to the still-limited literature on household-level immunization determinants in northern Nigeria, offering a replicable analytical template for similar studies elsewhere. Applying logistic regression to isolate independent determinants, rather than relying on bivariate associations alone, marks a methodological step up from many existing studies in the region. Students working on similar quantitative health research can get hands-on feedback on regression modelling and survey design through our research coaching service, which pairs students with experienced researchers.
At the national level, the study feeds into Nigeria's push to reach 90 percent full immunization coverage by 2030, in line with the National Immunization Strategic Plan, and contributes to the broader Sustainable Development Goal of ending preventable deaths among children under five.
Scope of the Study
The study is geographically confined to Kano Municipal Local Government Area, representing the urban context, and Kura Local Government Area, representing the rural context, both within Kano State, Nigeria. Temporally, it covers vaccinations received between 2022 and 2024, with the cross-sectional survey itself conducted between January and March 2024 among children aged 12 to 23 months present in sampled households at the time.
The vaccination schedule assessed is the WHO EPI eight-antigen schedule as implemented in Kano State: BCG at birth, OPV1 and DPT/Penta1 at 6 weeks, OPV2 and DPT/Penta2 at 10 weeks, OPV3 and DPT/Penta3 at 14 weeks, and Measles, Yellow Fever, and Meningitis C at 9 months. A child is considered fully immunized for the purposes of this study if they received all eight antigens by 12 months of age.
Operational Definition of Terms
Full Immunization Coverage: The proportion of children aged 12 to 23 months who have received all eight antigens in the WHO EPI schedule (BCG, OPV1-3, DPT/Penta1-3, Measles, Yellow Fever, and Meningitis C) by 12 months of age, verified through vaccination card or maternal recall.
Antigen-Specific Coverage: The proportion of children in the target population who have received a specific vaccine antigen, expressed as a percentage.
Dropout Rate: A programme performance indicator computed as: (DPT/Penta1 coverage minus DPT/Penta3 coverage) divided by DPT/Penta1 coverage, multiplied by 100. The WHO recommends a dropout rate below 10% as a threshold for acceptable programme performance.
Vaccination Card: The Nigerian Child Health Record, a home-based record document on which immunization dates and other child health information are recorded at each vaccination visit.
Vaccine Hesitancy: Active delay in acceptance or refusal of vaccines despite availability, influenced by factors including lack of confidence in vaccine safety or efficacy, complacency regarding vaccine-preventable disease risk, and convenience barriers.
Wealth Index: A composite measure of household economic status constructed from principal component analysis of household assets and services, grouped into quintile categories for analytical purposes.
Zero-Dose Child: A child who has not received a single dose of DTP vaccine, representing the most severely underserved stratum of the unimmunized child population.
Cold Chain: The temperature-controlled supply chain system maintaining vaccines at the appropriate storage temperature (2 to 8 degrees Celsius for most antigens) from manufacturing to point of administration.
Conclusion
Childhood immunization coverage in Kano State remains well short of where it needs to be, and the gap between rural and urban children is neither small nor accidental, it tracks closely with maternal education, household wealth, distance to care, and whether mothers know the vaccination schedule in the first place. This study set out to quantify those gaps and identify what actually predicts full immunization, giving programme managers a sharper, more targeted basis for closing them. Reaching Kano State's 90 percent coverage goal will depend less on broad national campaigns and more on precisely this kind of granular, evidence-driven targeting. Readers interested in related quantitative health and social research can explore more statistics project topics for further reading.
Frequently Asked Questions (FAQs)
What is the full immunization coverage rate in Kano State?
Overall full immunization coverage across the studied areas of Kano State was found to be 48.9 percent, with a wide gap between urban areas (61.7 percent) and rural areas (39.1 percent).
Which vaccine has the highest and lowest coverage in Kano State?
BCG recorded the highest coverage among the eight EPI antigens at 91.7 percent, while Meningitis C recorded the lowest at 54.2 percent.
What is a DPT/Penta dropout rate, and why does it matter?
The dropout rate measures the percentage of children who received the first dose of DPT/Penta but did not complete the third dose. In Kano State, this rate was 23.3 percent, more than double the WHO's recommended maximum of 10 percent, signalling that many children start but do not finish their vaccination series.
Why is there such a large urban-rural immunization gap in Kano State?
The gap is driven by a combination of factors, including lower maternal education, greater distance to primary health care facilities, lower household wealth, and limited maternal knowledge of the vaccination schedule, all of which are more pronounced in rural areas.
What is the strongest predictor of full immunization in this study?
Maternal knowledge of the childhood vaccination schedule was found to be the single strongest predictor of full immunization status, ahead of maternal education, household wealth, and distance to health facilities.
How does Kano State's immunization coverage compare to the national average?
National survey data estimates Nigeria's overall full immunization coverage at around 35 percent, while the north-west zone, including Kano State, lags well behind at approximately 19 percent, making it one of the lowest-coverage regions in the country.
What is the WHO Expanded Programme on Immunisation (EPI) schedule?
The EPI schedule in Nigeria covers eight antigens: BCG at birth, three doses each of OPV and DPT/Penta at 6, 10, and 14 weeks, and Measles, Yellow Fever, and Meningitis C vaccines at 9 months.
What interventions are recommended to improve immunization coverage in Kano State?
Recommendations include mobile vaccination outreach for communities beyond 5 kilometres from a health facility, community mobilisation through religious leaders, structured prenatal education on the vaccination schedule, solar-powered cold chain infrastructure for rural facilities, and active tracking of children who miss scheduled doses.
What is a zero-dose child?
A zero-dose child is one who has not received a single dose of the DTP vaccine, representing the most severely underserved group within the unimmunized child population.
Why does maternal education matter so much for immunization coverage?
Maternal education was found to be a statistically significant determinant of full immunization, likely because more educated mothers tend to have greater health literacy, better awareness of the vaccination schedule, and more confidence engaging with the health system on their children's behalf.
Link Summary
Internal links (3):
● Sample research projects library — https://www.scholarnesthub.com/projects
● Statistics department project archive / topics — https://www.scholarnesthub.com/projects?department=statistics
● Research coaching service — https://www.scholarnesthub.com/services
External links (2):
● World Health Organization — Immunization Coverage Fact Sheet — https://www.who.int/news-room/fact-sheets/detail/immunization-coverage
● UNICEF Nigeria — 2021 MICS/National Immunization Coverage Survey Report — https://www.unicef.org/nigeria/reports/2021-multiple-indicator-cluster-survey-national-immunization-coverage-survey-report
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