A photo taken Sunday of Kaci Hickox in an isolation tent at University Hospital in Newark, N.J. Hickox, who was later discharged and allowed to return to her home in Maine, says she has no intention of abiding by a "voluntary" quarantine there. Steven Hyman/AP hide caption

itoggle caption Steven Hyman/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

An Ebola health alert is displayed at the entrance to Bellevue Hospital in New York City, where Dr. Craig Spencer was quarantined after showing symptoms consistent with the virus. Bryan Thomas/Getty Images hide caption

itoggle caption Bryan Thomas/Getty Images

Australia is no longer processing new visa applications from the three worst-hit countries in Africa's Ebola outbreak. Here, a jetliner prepares to land at Sydney's international airport. Jason Reed/Reuters/Landov hide caption

itoggle caption Jason Reed/Reuters/Landov