Safe and small: The credit-card-sized test for anthrax destroys the deadly bacteria after the test completes. Courtesy of Sandia Nation hide caption

itoggle caption Courtesy of Sandia Nation

Maria Carmen Castro, 46, of Lima, Peru, is a survivor of MDR-TB — multidrug-resistant tuberculosis. Partners In Health treated her and loaned her money to open a small store. "Because of my TB and thanks to God and Partners In Health, now I have my own business," she says. Jason Beaubien/NPR hide caption

itoggle caption Jason Beaubien/NPR

It's not the real deal. This Ebola Treatment Unit was set up for a TED talk in Vancouver so people could get a sense of what the units are like, and what it's like to put on the protective suit. Nina Gregory hide caption

itoggle caption Nina Gregory

Light shines through the chlorine-stained windows in the blood-testing area at Redemption Hospital in New Kru Town, Monrovia, Liberia. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

Polina, 37, rests in a hospital bed in St. Petersburg, Russia, in 2011. She is severely malnourished and suffers from numerous diseases, including tuberculosis, hepatitis C and HIV. Misha Friedman hide caption

itoggle caption Misha Friedman

The European Union banned the use of antibiotics to boost animals' growth in 2006. At first, the ban had little effect on the amount of drugs given to pigs. Carsten Rehder/Corbis hide caption

itoggle caption Carsten Rehder/Corbis

These teens from the Xhosa tribe wear traditional garb and paint after their coming-of-age circumcision ceremony near Qunu, South Africa. CARL DE SOUZA/AFP/Getty Images hide caption

itoggle caption CARL DE SOUZA/AFP/Getty Images

The effects of malaria in the brain are clear: A healthy brain, right, has many grooves and crevices. But when the brain swells up, left, these crevices smooth out. Courtesy of Michigan State University hide caption

itoggle caption Courtesy of Michigan State University

Brazilian mothers participate in a demonstration in 2011 for the right to breastfeed in public, in Sao Paulo, Brazil. Eduardo Anizelli/STF/LatinContent/Getty Images hide caption

itoggle caption Eduardo Anizelli/STF/LatinContent/Getty Images

UNICEF workers assemble "school infection prevention kits" in Monrovia, Liberia, to stop the spread of Ebola back in January. John Moore/Getty Images hide caption

itoggle caption John Moore/Getty Images

A mother feeds her new baby at the Yida refugee camp in South Sudan, which has the highest maternal mortality rate in the world. About 1 in 7 women in South Sudan die from causes related to pregnancy. Paula Bronstein/Getty Images hide caption

itoggle caption Paula Bronstein/Getty Images

Health workers are disinfected with a chlorine solution after treating patients at the Hastings Ebola Treatment Center in Freetown, Sierra Leone. Nine American aid workers have contracted Ebola while working in West Africa. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

Tarkpor Mambia in front of the Supreme Court in Washington, D.C. He says he "literally froze" during his first American winter in 2013, but is getting used to the cold weather. Ryan Kellman/NPR hide caption

itoggle caption Ryan Kellman/NPR