Nina Pham, 26, steps off a plane Thursday night at a municipal airport in Frederick, Md. An ambulance was waiting to take her to the National Institutes of Health in Bethesda, Md.
Paul J. Richards/AFP/Getty Images
Victoria Ruiz (left), a postdoctoral fellow in immunology, works with Brianna Delgado, a high school student that she mentors, at the Blaser Lab, inside NYU's Langone Medical Center in New York, NY.
Ramsay de Give for NPR
Two chimps groom each other at the Save the Chimps facility in Florida. The National Institutes of Health owns about 360 chimpanzees that aren't yet retired and that are living at research facilities; new guidelines say most of its chimps should be retired.
Save the Chimps