Determinants of Vaccine Hesitancy and Its Impact on Immunization Coverage in Pakistan: A Narrative Review

Abstract

Background: Vaccine hesitancy has emerged as a major barrier to immunization performance worldwide and remains particularly concerning in Pakistan, where incomplete vaccine uptake continues to compromise disease control and public-health protection. The problem is shaped not only by individual reluctance, but also by misinformation, sociocultural influences, distrust in vaccination programmes, and persistent health-system weaknesses. Objective: To narratively review the principal determinants of vaccine hesitancy in Pakistan and examine their impact on immunization coverage. Methods: A narrative review was conducted using literature from PubMed/MEDLINE, Google Scholar, BMC-indexed sources, national survey materials, and public-health reports published between 1998 and 2025. Sources were selected for relevance to vaccine acceptance, refusal, delayed uptake, immunization barriers, and vaccine-related public trust in Pakistan. Findings were synthesized thematically using an interpretive socio-ecological framework. Results: The evidence identified four dominant and overlapping drivers of vaccine hesitancy: inadequate vaccine knowledge, misinformation and culturally reinforced myths, weak trust in health and government vaccination initiatives, and structural barriers within the healthcare system. Reported indicators in the reviewed literature included inadequate vaccine knowledge among 90% of participants in one cited study, lack of access to trained vaccinators among 87% of respondents, vaccine shortages reported by 24.5%, and parental refusal reaching up to 22% in selected regions. Full immunization remained incomplete, with approximately two-thirds of children who initiated vaccination reported as fully immunized. Mobile-based awareness interventions were associated with up to 30% improvement in preventive behaviour. Conclusion: Vaccine hesitancy in Pakistan is a multifactorial and context-sensitive challenge that significantly disrupts immunization coverage. Effective response requires integrated strategies combining community engagement, myth-correction, reliable vaccine delivery, strengthened frontline services, and restoration of public trust.