Fourth-grader Jasmine Johnson got a FluMist spray at her Annapolis, Md., elementary school in 2007. This year, the nasal spray vaccine isn't recommended. Susan Biddle/Washington Post/Getty Images hide caption

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Doctors don't always suggest that pregnant women get flu shots, which may account for the relatively low vaccination rates. Jamie Grill/Tetra images RF/Getty Images hide caption

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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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