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Vaccines are effective, safe, inexpensive, and “a silver bullet for public health” that help save countless lives across the world each year. That’s according to Robin Nandy, Principal Adviser and Chief of Immunization for the UN Children’s Fund, speaking on the launch day on Wednesday, of UNICEF’s #VaccinesWork campaign. It’s also the beginning of World Immunization Week, and UN News’s Siwen Qian began by asking Mr. Nandy, to explain how vaccination works.

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