At a Chinese hospital, a woman holds her child, who's receiving a rabies vaccine after being scratched by a cat. Vaccines against rabies were among the millions that were part of a newly discovered racket, reselling vaccines that hadn't been refrigerated. VCG/Getty Images hide caption

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Why Chinese Parents Don't Necessarily Trust Childhood Vaccines
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A Pakistani health worker gives a polio vaccine to students in Peshawar, Pakistan, in March. Polio remains endemic in Pakistan after the Taliban banned vaccinations, attacks targeted medical staffers and suspicions lingered about the inoculations. Mohammad Sajjad/AP hide caption

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The Angolan military administers yellow fever vaccines at a market in Luanda, the capital city. Joost De Raeymaeker/EPA/Corbis hide caption

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A 'Forgotten Disease' Is Suddenly Causing New Worries
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Why Scientists Hope To Inject Some People With Zika Virus
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Becoming a father made Dr. Namala Mkopi appreciate why parents worry so much. He's been a leading advocate for childhood vaccines in his native Tanzania. Ben de la Cruz/NPR hide caption

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A nurse in Hyderabad, India, gives a vaccine to a child. The immunization will protect against diphtheria, pertussis, tetanus and other diseases. Noah Seelam/AFP/Getty Images hide caption

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Parents In Poor Countries Worry About Vaccines, Too
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