Members of the community in New Georgia Signboard greet President Ellen Johnson-Sirleaf Monday for the launch of the Ebola Must Go! campaign. John W. Poole/NPR hide caption

itoggle caption John W. Poole/NPR

A worker puts the finishing touches on the dividers that will separate patients at the community care center in the Port Loko district of Sierra Leone. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

Viruses can spread through the air in two ways: inside large droplets that fall quickly to the ground (red), or inside tiny droplets that float in the air (gray). In the first route, called droplet transmission, the virus can spread only about 3 to 6 feet from an infected person. In the second route, called airborne transmission, the virus can travel 30 feet or more. Adam Cole/NPR hide caption

itoggle caption Adam Cole/NPR

Dr. Komba Songu M'Briwah, left, talks on the phone while staff members disinfect offices at the Hastings Ebola Treatment Center in Freetown. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

India has record no Ebola cases, but the country is on high alert and has quarantined hundreds of travelers from West Africa. This hospital in New Delhi has set up an Intensive Care Unit for potential Ebola patients. Sajjad Hussain/AFP/Getty Images hide caption

itoggle caption Sajjad Hussain/AFP/Getty Images

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