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

Mary Mallon, known as "Typhoid Mary," was immune to the typhoid she carried. Working as a cook, she spread the disease in New York and ended up quarantined on Brother Island (above) for more than two decades. Bettmann/Corbis hide caption

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Dallas-area resident James Faulk turned his yard into an Ebola treatment center for Halloween. But he has a serious side: His Twitter account raises funds for Doctors Without Borders, a group active in the fight against the virus. Tom Pennington/Getty Images hide caption

itoggle caption Tom Pennington/Getty Images

Domitilia, 57, is a diabetic patient in the Dominican Republic who contracted tuberculosis. She's now cured of TB after two years of treatment. Javier Galeano/The Union hide caption

itoggle caption Javier Galeano/The Union

Mumadou Traore says the Ivory Coast's French bureaucracy is a "blessing" when it comes to Ebola. Gregory Warner/NPR hide caption

itoggle caption Gregory Warner/NPR

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

The nursing staff get a break at the Ebola care center run by Doctors Without Borders in Foya, Liberia. The center has helped stop the spread of the virus. Michealeen Doucleff/NPR hide caption

itoggle caption Michealeen Doucleff/NPR

New Jersey Governor Chris Christie (right) and New York Governor Andrew Cuomo both insist on mandatory quarantine for healthcare workers who've had contact with Ebola patients. Christie wants them held in a medical facility; Cuomo says a home quarantine with outside monitoring would do. Mark Lennihan/AP hide caption

itoggle caption Mark Lennihan/AP