Icon Genetics' Dr. Frank Thieme selects samples of Nicotiana benthamiana, a relative of tobacco, growing in a company greenhouse in Halle, Germany. The company uses the plants to produce antibodies that could be helpful for increasing supplies of ZMapp. Sean Gallup/Getty Images hide caption

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A man stands above a new Ebola treatment center in Monrovia, Liberia. Health workers in Liberia, the hardest-hit nation, have turned people away from treatment units because of shortages of beds and staff. Pascal Guyot/AFP/Getty Images hide caption

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Federal prosecutors allege two nursing homes in California have "persistently and severely overmedicated elderly and vulnerable residents." Antipsychotic drugs like risperidone, also known as Risperdal, can be dangerous for elderly people, but are frequently prescribed to nursing home patients. JB Reed/Bloomberg via Getty Images hide caption

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A Public Health Agency of Canada worker seen inside the National Microbiology Laboratory's Level 4 lab in Winnipeg. Public Health Agency of Canada/Nature hide caption

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Dr. Bruce Ribner, medical director of Emory University Hospital's infectious disease unit, embraces Dr. Kent Brantly (left) who was treated with an experimental Ebola medicine and released from the Atlanta hospital Thursday. John Bazemore/AP hide caption

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Truvada, an FDA-approved drug to help prevent HIV infection, is among the AIDS drugs that fill pharmacy shelves at the Whitman-Walker clinic, a Washington, D.C., community health center. Astrid Riecken/MCT/Landov hide caption

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