When a high-risk patient is evacuated, strict precautions are followed. Above, aid workers and doctors in protective gear transfer Manuel Garcia Viejo, a Spanish priest diagnosed with Ebola, to a waiting ambulance at a Madrid airport. Spanish Defense Ministry/AP hide caption

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Spanish Defense Ministry/AP

Dr. Rick Sacra, who had worked in Liberia in previous years, went back in August to tend to pregnant women and to children. The 51-year-old Massachusetts family physician is the third American to contract the Ebola virus. Courtesy of SIM hide caption

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Courtesy of SIM