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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

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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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

A nurse walks towards the Roger Salengro Hospital in Lille, France, where two patients were diagnosed with a coronavirus related to SARS. Michel Spingler/AP hide caption

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Michel Spingler/AP