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U.S. authorities are working on an emergency deal to import the yellow fever vaccine Stamaril, which is not currently licensed in the U.S. BSIP/UIG via Getty Images hide caption

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BSIP/UIG via Getty Images

Medics tend to an Iraqi counterterrorism fighter injured in a clash with ISIS forces near the village of Bazwaya, on the eastern edge of Mosul. Bulent Kilic /AFP/Getty Images hide caption

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Bulent Kilic /AFP/Getty Images

No One Was Prepared To Care For So Many Wounded In Mosul

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The World Health Organization's finalists for the next director-general (from left): Tedros Adhanom Ghebreyesus, Sania Nishtar and David Nabarro Fabrice Coffrini and Justin Tallis/AFP/Getty Images hide caption

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Fabrice Coffrini and Justin Tallis/AFP/Getty Images

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

Dr. Margaret Chan is director-general of the World Health Organization. In her first major address on Zika, delivered Thursday in Geneva, she said: "Questions abound. We need to get some answers quickly." Sandro Campardo//epa/Corbis hide caption

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Sandro Campardo//epa/Corbis

A female sanitation worker wears standard gear for a Doctors Without Borders Ebola center. The outfit includes rubber boots, goggles, a face mask, a hood, three layers of gloves, a Tyvek suit and thick rubber apron. No exposed skin is allowed. She was photographed in Monrovia, Liberia. John W. Poole/NPR hide caption

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John W. Poole/NPR

Gear Wars: Whose Ebola Protective Suit Is Better?

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Dr. Patrick Kamara adjusts his googles on the final day of training and the first "dress rehearsal" before being sent out to Ebola treatment units. The World Health Organization is ramping up to train up to 500 new health workers a week as part of the effort to stem the spread of Ebola. John W. Poole/NPR hide caption

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John W. Poole/NPR

On Front Lines Against Ebola, Training A Matter Of Life Or Death

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A World Health Organization worker trains nurses how to use Ebola protective gear in Freetown, Sierra Leone. Michael Duff/AP hide caption

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Michael Duff/AP

Dire Predictions On Ebola's Spread From Top Health Organizations

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A man lies in a newly opened Ebola isolation center in a closed school in Monrovia, Liberia, on Thursday. The official death toll of 1,000 people in four countries is likely below the actual number, the World Health Organization says. John Moore/Getty Images hide caption

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John Moore/Getty Images

Miguel Pajares, a Spanish priest who was infected with the Ebola virus while working in Liberia, is transferred from a plane to an ambulance after arriving in Spain. He was treated with an experimental drug but died on the disease. Spanish Defense Ministry/AP hide caption

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Spanish Defense Ministry/AP

In 1995, amid an Ebola outbreak, Zairian Red Cross personnel picked up sick people and bodies left on the streets of Kikwit, 250 miles from the capital Kinshasa. Jean-Marc Bouju/AP hide caption

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Jean-Marc Bouju/AP

Why Treating Ebola With An Experimental Serum Might Help

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AIDS drugs line a pharmacy's shelves. A new recommendation from the World Health Organization suggests a daily anti-HIV pill for men who have sex with men. Astrid Riecken/MCT/Landov hide caption

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Astrid Riecken/MCT/Landov