https://goodwoodpub.com/index.php/RNHR <p align="justify">Review of Nursing and Healthcare Research (RNHR) is an international, peer-reviewed, open-access and scholarly journal which publishes high quality, innovative, and well-developed manuscripts covering original research articles, review articles, book reviews and case reports aimed at advancing both theoretical and practical development on all related aspects of nursing and healthcare.</p> Goodwood Publishing en-US Review of Nursing and Healthcare Research <p>Authors who publish with this journal agree to the following terms:</p> <ol> <li class="show">Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a&nbsp;<a href="http://creativecommons.org/licenses/by-sa/4.0/" target="_blank" rel="noopener">Creative Commons Attribution License (CC BY-SA 4.0)</a>&nbsp;that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this journal.</li> <li class="show">Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal.</li> <li class="show">Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work.</li> </ol> https://goodwoodpub.com/index.php/RNHR/article/view/3378 <p><strong>Purpose: </strong>This study aimed to determine the prevalence and determinants of routine immunization default among mothers of children aged 0–59 months in Ido Local Government Area (LGA), Oyo State, Nigeria, and to evaluate the effectiveness of implemented catch-up strategies.</p> <p><strong>Methodology/approach: </strong>A descriptive cross-sectional study was conducted with 420 mothers selected through multi-stage sampling. Data were obtained using structured interviewer-administered questionnaires and analyzed with SPSS version 26. Descriptive statistics summarized sociodemographic and immunization variables, while logistic regression identified predictors of defaulting. Key informant interviews with healthcare providers were thematically analyzed to assess catch-up strategies and contextual barriers.</p> <p><strong>Results/findings: </strong>The study revealed an immunization default rate of 34.8%. The main reasons cited for defaulting included lack of awareness of return dates (41.2%), long distances to health facilities (26.5%), and vaccine stock-outs (19.3%). Significant predictors were maternal education level (p=0.002), place of delivery (p=0.015), and knowledge of immunization schedules (p&lt;0.001). Catch-up strategies such as house-to-house visits, SMS reminders, and mobilization by religious and traditional leaders were moderately effective but insufficient in hard-to-reach areas.</p> <p><strong>Conclusions</strong>: Routine immunization defaulting persists as a significant public health challenge in Ido LGA. Socioeconomic, educational, and systemic barriers hinder full coverage, necessitating more robust interventions</p> <p><strong>Limitations: </strong>The cross-sectional design restricts causal inference, and self-reported data may introduce recall bias.</p> <p><strong>Contribution:</strong> The study provides empirical evidence to strengthen catch-up strategies and guide policy toward equitable immunization coverage.</p> Aibinuomo Ayomide Oluwaseyi Joy Anorue Akande Deborah Tolulope Agboola Abimbola Akoje Daniels Florence Tola Idowu Oluwatoyin Margaret Copyright (c) 2025 Aibinuomo Ayomide Oluwaseyi, Joy Anorue, Akande Deborah Tolulope, Agboola Abimbola Akoje, Daniels Florence Tola, Idowu Oluwatoyin Margaret https://creativecommons.org/licenses/by-sa/4.0 2025-08-28 2025-08-28 1 1 1 13 10.35912/rnhr.v1i1.3378