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Vaccines are a major public health success story, but the COVID-19 pandemic underscores the many challenges involved in getting a vaccine to everyone who needs it.
The coronavirus pandemic has highlighted the challenges of not only developing vaccines, but also making sure everyone who should get them does. High hopes have been placed on the global distribution of promising vaccines from Pfizer and BioNTech and from Moderna, among others, but vaccination campaigns can face many hurdles: limited availability, public mistrust, and dosage and storage requirements can all jeopardize vaccination coverage. A look at previous vaccine distribution efforts showcases some of the main challenges.