Why Vaccine Hesitancy Cannot Be Solved with a Single Global Strategy
Research across Brazil and South Africa indicates that vaccine hesitancy is driven by a complex mix of structural barriers for lower-income families and value-based distrust among the affluent. Effective immunization policy must be culturally responsive and address these specific social realities.
Highlights
- •Brazil and South Africa have seen a decade-long decline in childhood immunization coverage.
- •Practical barriers like long wait times and supply issues impact low-income families' vaccination access.
- •Higher-income families often resist vaccines due to concerns about autonomy, safety, and medical distrust.
- •Effective public health policy requires context-aware communication that addresses diverse social and structural realities.
Vaccine hesitancy is a complex global challenge that cannot be attributed to a single cause, as evidenced by recent academic research conducted in Brazil and South Africa. Over the last decade, both nations have witnessed a troubling decline in immunization rates, which has begun to erode hard-won progress in protecting children from preventable illnesses like measles, polio, diphtheria, and whooping cough.
Despite having robust, universal, and free childhood immunization programs, coverage has dropped significantly. In Brazil, rates have fallen by 10% to 20% since 2016. Similarly, South Africa has seen a steady decrease, with the first dose of the measles-containing vaccine—a primary indicator of program health—declining from 86% in 2015 to 76% by 2024. Researchers, including Camila Matos, Marcia Couto, and Charles Shey Wiysonge, have analyzed how diverse social realities shape these vaccination trends.
Understanding the Drivers of Vaccine Hesitancy
The study reveals that vaccine hesitancy is not a uniform phenomenon but is instead rooted in vastly different social and economic contexts. For lower-income families, the primary obstacles are practical. Long waiting times at clinics, limited operating hours, transportation challenges, and occasional supply shortages create significant barriers that often result in delayed or incomplete vaccination schedules rather than total refusal.
Conversely, in higher-income demographics, decisions to decline or alter vaccine schedules are often driven by value-based concerns. These families frequently emphasize personal autonomy, individual choice, and a preference for natural lifestyles. Their reluctance is often framed as a critique of medical institutions and the pharmaceutical industry, highlighting a deep-seated distrust that is distinct from the structural barriers faced by marginalized populations.
Furthermore, country-specific anxieties play a role. In South Africa, caregivers have expressed fears regarding links to conditions such as autism, while in Brazil, concerns are often directed at the intensity of the immunization schedule, specifically the high volume of vaccines and doses required during a single visit.
To effectively address these falling immunization rates, public health authorities must move beyond simplistic one-size-fits-all communication strategies. Vaccine hesitancy is deeply tied to social positions, race, class, and lived experiences with healthcare systems. Experts argue that placing social sciences at the heart of health policy is essential. Future immunization strategies must be culturally responsive and context-aware, acknowledging that rebuilding public confidence requires both structural improvements to health service access and targeted, respectful communication that addresses the diverse concerns of different community groups.
