The outbreak of Middle East respiratory syndrome is slowing down in South Korea, but people were still wearing surgical masks around Seoul on Monday. Ed Jones/AFP/Getty Images hide caption

itoggle caption Ed Jones/AFP/Getty Images

A police officer guards the home of a family under a 21-day Ebola quarantine in Freetown, Sierra Leone, back in March. Michael Duff/AP hide caption

itoggle caption Michael Duff/AP

In front of the emergency room at the Samsung Medical Center in Seoul, medical workers care for a man suspected of having the Middle Respiratory syndrome on Monday. Jung Yeon-Je/AFP/Getty Images hide caption

itoggle caption Jung Yeon-Je/AFP/Getty Images

Primal posture: Ubong tribesmen in Borneo (right) display the perfect J-shaped spines. A woman in Burkina Faso (left) holds her baby so that his spine stays straight. The center image shows the S-shaped spine drawn in a modern anatomy book (Fig. I) and the J-shaped spine (Fig. II) drawn in the 1897 anatomy book Traite d'Anatomie Humaine. Courtesy of Esther Gokhale and Ian Mackenzie/Nomads of the Dawn hide caption

itoggle caption Courtesy of Esther Gokhale and Ian Mackenzie/Nomads of the Dawn

Patient one: A businessman brought the Middle East respiratory syndrome to South Korea in early May. Since then, he has likely spread the virus to more than 20 other people. Several of those have passed the virus onto others. Maia Majumder/Health Map hide caption

itoggle caption Maia Majumder/Health Map

Health workers collect the body of a cholera victim in Petionville, Haiti, February 2011. The cholera outbreak in Haiti began in October 2010. Nearly 9,000 people have died. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

Patients receive treatment at the Chest Disease Hospital in Srinagar, India. The country has one of the highest rates of drug-resistant tuberculosis in the world, in part because antibiotics for the disease are poorly regulated by the government. Dar Yasin/AP hide caption

itoggle caption Dar Yasin/AP

The Ebola outbreak "overwhelmed" the World Health Organization and made it clear the agency must change, WHO's director-general, Dr. Margaret Chan, said Monday in Geneva. Fabrice Coffrini /AFP/Getty Images hide caption

itoggle caption Fabrice Coffrini /AFP/Getty Images

Worth a little pain? Back in 1990, a school boy got a measles shot in the U.K., and it turns out, he got more than protection against the measles. Photofusion/UIG via Getty Images hide caption

itoggle caption Photofusion/UIG via Getty Images

Lucy Barh, head of the Liberian Midwives Association, says of the impending end of the Ebola outbreak: "It is a joy, it is a joy. And I am so grateful to God. The Lord almighty has love for this nation. That is why we have come to this point." Jason Beaubien/NPR hide caption

itoggle caption Jason Beaubien/NPR

Health worker Jackie Carnegie delivers a rubella vaccine in Colorado in 1972. Ira Gay Sealy/Denver Post via Getty Images hide caption

itoggle caption Ira Gay Sealy/Denver Post via Getty Images

Liberian workers dismantle shelters in an Ebola treatment center in the Paynes Ville neighborhood of Monrovia. Doctors Without Borders closed the center last month because it was no longer needed. Zoom Dosso/AFP/Getty Images hide caption

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A woman cultivates seaweed off the coast of Madagascar to counter overfishing. She's working with Blue Ventures, a business that supports its conservation projects by giving ecotours. Courtesy of Skoll Foundation hide caption

itoggle caption Courtesy of Skoll Foundation

Colored brain scan of a 17-year-old boy with mad cow disease. The bright yellow spots are a sign that the thalamus is damaged by diseased proteins. Simon Fraser/Science Source hide caption

itoggle caption Simon Fraser/Science Source

At her home in the U.K., Malala Yousafzai reads her letter to the missing Nigerian schoolgirls. Courtesy of Malala Fund hide caption

itoggle caption Courtesy of Malala Fund

A year ago, Lina says her parents took her to Yemen because her grandmother was gravely ill. But when the family arrived, Lina's father announced that she would be getting married to a local man. Renee Deschamps/Getty Images/Vetta hide caption

itoggle caption Renee Deschamps/Getty Images/Vetta

Secretary of State John Kerry and African Union Commission Chairperson Nkosazana Dlamini Zuma signed an agreement Monday to establish the first Centers for Disease Control and Prevention in Africa. The U.S. will provide technical advice and a few staff for the agency. Alex Wong/Getty Images hide caption

itoggle caption Alex Wong/Getty Images