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Examples of what the iphone app looks for: The white reflection from an otherwise dark pupil can indicate a tumor, a cataract, or other eye problems. Claire Eggers/NPR hide caption

itoggle caption Claire Eggers/NPR

Stringy particles of Ebola virus (blue) bud from a chronically infected cell (yellow-green) in this colorized, scanning electron micrograph. NIAID/Science Source hide caption

itoggle caption NIAID/Science Source

Don't look for leading Ebola researchers at the Sheraton New Orleans. Louisiana health officials told doctors and scientists who have been in West Africa not to come to a medical meeting in town. Prayitno/Flickr hide caption

itoggle caption Prayitno/Flickr

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A man wears a protective mask as he carries a bouquet of flowers at Women's College Hospital in Toronto in March 2003, when SARS fears about were widespread. Kevin Frayer/AP hide caption

itoggle caption Kevin Frayer/AP

Ebola patient Amber Vinson arrived by ambulance at Emory University Hospital on Oct. 15. Now healthy, Vinson was discharged from the hospital Tuesday. Kevin C. Cox/Getty Images hide caption

itoggle caption Kevin C. Cox/Getty Images

Home health care workers Jasmine Almodovar (far right) and Artheta Peters (center) take part in a Cleveland rally for higher pay on Sept. 4. Sarah Jane Tribble/WCPN, Ideastream hide caption

itoggle caption Sarah Jane Tribble/WCPN, Ideastream

Magnified 25,000 times, this digitally colorized scanning electron micrograph shows Ebola virus particles (green) budding from an infected cell (blue). CDC/NIAD hide caption

itoggle caption CDC/NIAD

Caltech biochemical engineer Frances Arnold was awarded a National Medal of Technology and Innovation by President Obama in 2013. Jason Reed/Reuters/Landov hide caption

itoggle caption Jason Reed/Reuters/Landov

A woman on the L train in New York City last week covers her face, fearful because a doctor with Ebola rode the train days earlier. Epidemiologists say people on the subway were not at risk. Stephen Nessen /WNYC hide caption

itoggle caption Stephen Nessen /WNYC