World Health Organization World Health Organization

A convoy of Syrian Red Crescent trucks arrives in Douma, in the Syrian rebel-held enclave of Eastern Ghouta, on Monday. This aid convoy is the first to reach the besieged area in weeks. Amer Almohibany/AFP/Getty Images hide caption

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Amer Almohibany/AFP/Getty Images

Smallpox virus, colorized and magnified in this micrograph 42,000 times, is the real concern for biologists working on a cousin virus — horsepox. They're hoping to develop a better vaccine against smallpox, should that human scourge ever be used as a bioweapon. Chris Bjornberg/Science Source hide caption

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Chris Bjornberg/Science Source

Did Pox Virus Research Put Potential Profits Ahead of Public Safety?

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Women line up to vaccinate their children in Kitahurira village, Uganda. Andrew Aitchison/Corbis via Getty Images hide caption

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Andrew Aitchison/Corbis via Getty Images

Health Care Costs Push A Staggering Number Of People Into Extreme Poverty

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Workers spray to kill fleas in a public school in Antananarivo, Madagascar's capital. A bite from an infected flea can spread the plague, which has stricken 157 people in the island nation since August. Anadolu Agency/Getty Images hide caption

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Anadolu Agency/Getty Images

Supporters of Tedros Adhanom Ghebreyesus rally for his candidacy for World Health Organization director-general in Geneva on May 23. Fabrice Coffrini/AFP/Getty Images hide caption

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World Health Organization Elects First Director-General From Africa

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On the list of pathogens (from left): Staphylococcus aureus (causes skin infections, pneumonia, bloodstream infections), Pseudomonas aeruginosa (causes blood infections, pneumonia, infections after surgery) and Neisseria gonorrhoeae (causes the sexually-transmitted disease gonorrhea). NIAID; Scott Chimileski and Roberto Kolter, NIH Image Gallery/Flickr; NIAID hide caption

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NIAID; Scott Chimileski and Roberto Kolter, NIH Image Gallery/Flickr; NIAID

A member of the Syrian government forces watches during an evacuation of Syrian rebel fighters and civilians from a opposition-held area of Aleppo on Friday. George Ourfalia/AFP/Getty Images hide caption

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A mother holds her baby, who has microcephaly, in Recife, Brazil. Mario Tama/Getty Images hide caption

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Zika No Longer Global 'Health Emergency,' WHO Declares

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One of these candidates will be the next head of WHO. Top row from left: Tedros Adhanom Ghebreyesus, Flavia Bustreo, David Nabarro. Bottom row from left: Miklós Szócska, Sania Nishtar, Philippe Douste-Blazy. Getty Images, AP and WHO hide caption

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Getty Images, AP and WHO