Vaccination efforts made in the world’s poorest countries since 2001 will have prevented 20 million deaths and saved $350 billion in health-care costs by 2020, as reported in the Bulletin of the World Health Organization.

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Vaccination efforts made in the world’s poorest countries since 2001 will have prevented 20 million deaths and saved $350 billion in health-care costs by 2020, as reported in the Bulletin of the World Health Organization.