The Essential Program on Immunization is 50: Milestones, achievements, and future directions

https://www.news-medical.net/health/The-Essential-Program-on-Immunization-is-50-Milestones-achievements-and-future-directions.aspx Immunization strategies: What lessons can we learn from successful campaigns? https://www.news-medical.net/health/Immunization-strategies-What-lessons-can-we-learn-from-successful-campaigns.aspx