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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Mohammad Sajjad/AP

Measles, the reorganization of the World Health Organization and the Zika virus could all make global health headlines in 2016. Rich Pedroncelli, Raphael Satter, Felipe Dana/AP hide caption

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Rich Pedroncelli, Raphael Satter, Felipe Dana/AP

Ukrainian deputy minister of health Igor Pereginets holds a 2-year-old getting a polio vaccination in Kiev on October 21 — part of a campaign launched after two cases were reported in September. Genya Savilov/AFP/Getty Images hide caption

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Genya Savilov/AFP/Getty Images

April 1959: Bottles containing the polio vaccine. M. McKeown/Getty Images hide caption

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M. McKeown/Getty Images

The Oral Polio Vaccine Can Go 'Feral,' But WHO Vows to Tame It

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Alyson Hurt/NPR

Next Year Could Mark The End Of Polio

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Two polio cases have been reported in Ukraine, where some parents are fearful of vaccinations. Above: A child receives the diphtheria, whooping cough and tetanus vaccine in a children's hospital in Kiev. Sergei Chuzavkov/AP hide caption

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Sergei Chuzavkov/AP

These two Portuguese language posters are pro-inoculation. The one at left, produced in 1977, says, "Vaccinate and protect the children." The one at right, from '87, sends a similar message, noting that vaccination offers an opportunity for every youngster. National Library of Medicine hide caption

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National Library of Medicine

A child is vaccinated in Makadara Health Clinic, Nairobi, Kenya. Greg Warner/NPR hide caption

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Greg Warner/NPR

Catholic Bishops In Kenya Call For A Boycott Of Polio Vaccines

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At the health clinic in Minjibir, Nigeria, a child is immunized for polio. David Gilkey/NPR hide caption

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David Gilkey/NPR

Polio Is Active In Only 3 Countries. Soon It Could Be Down To 2

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In this 2012 photograph, Adamu Ali carries his 4-year-old son, Omar, who was stricken with polio earlier that year. They live in the Nigerian village of Minjibir. David Gilkey/NPR hide caption

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David Gilkey/NPR

Nigeria Is On The Verge Of Bidding Goodbye To Polio

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A comic book captures the attention
 of Guinea worm patients Sadia Mesuna (right) and Fatawu Yakubu at a center for patients in Ghana. Louise Gubb/Courtesy of The Carter Center hide caption

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Louise Gubb/Courtesy of The Carter Center

The documentary film, "Every Last Child," chronicles the efforts to eradicate polio in Pakistan. Women play a key role — they're welcome in homes to share information, while men are not. Courtesy of "Every Last Child" hide caption

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Courtesy of "Every Last Child"

A child receives a polio vaccine during National Immunization Days in the Nigerian city of Kano. Diego Ibarra Sanchez /Courtesy of Rotary Foundation hide caption

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Diego Ibarra Sanchez /Courtesy of Rotary Foundation