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Quick Facts About Ebola

A comparison of reproduction numbers, or R0s, for several viruses. R0 is one measure of contagiousness.
Adam Cole NPR
A comparison of reproduction numbers, or R0s, for several viruses. R0 is one measure of contagiousness.

A CDC poster shows ways Ebola isn't spread.
CDC
A CDC poster shows ways Ebola isn't spread.

Medical workers with the Liberian Red Cross carry the body of a victim of the Ebola virus on Sept. 4, in Banjor, Liberia.
Dominique Faget AFP/Getty Images
Medical workers with the Liberian Red Cross carry the body of a victim of the Ebola virus on Sept. 4, in Banjor, Liberia.

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Jeff Hulbert of Annapolis, Md., holds up a sign to stop flights in front of the White House last Friday.
Allison Shelley Getty Images
Jeff Hulbert of Annapolis, Md., holds up a sign to stop flights in front of the White House last Friday.

Dallas County Judge Clay Jenkins waits outside a unit at the Ivy Apartments, where Thomas Eric Duncan, the first person to die of Ebola in the U.S., was staying in Dallas.
Tom Pennington Getty Images
Dallas County Judge Clay Jenkins waits outside a unit at the Ivy Apartments, where Thomas Eric Duncan, the first person to die of Ebola in the U.S., was staying in Dallas.

Health officials use a thermometer to screen passengers at the arrival hall of Murtala Mohammed International airport in Lagos, Nigeria, on Monday.
Sunday Alamba AP
Health officials use a thermometer to screen passengers at the arrival hall of Murtala Mohammed International airport in Lagos, Nigeria, on Monday.

The apartment where Ebola victim Thomas Eric Duncan stayed when he fell ill remains under quarantine 12 days after his death on Oct. 20 in Dallas.
Chip Somodevilla Getty Images
The apartment where Ebola victim Thomas Eric Duncan stayed when he fell ill remains under quarantine 12 days after his death on Oct. 20 in Dallas.

Engineered proteins glow under ultraviolet light on the leaves of N. benthamiana plants, which are being developed by Icon Genetics to produce ingredients for an Ebola treatment called Zmapp.
Sean Gallup Getty Images
Engineered proteins glow under ultraviolet light on the leaves of N. benthamiana plants, which are being developed by Icon Genetics to produce ingredients for an Ebola treatment called Zmapp.

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How big is Africa? This illustration shows how many countries and regions could fit inside "the cradle of humankind."
Kai Krause
How big is Africa? This illustration shows how many countries and regions could fit inside "the cradle of humankind."

Ralph Orlowski Reuters/Landov

Basic information about Ebola isn't as clear as it probably could be.

A recent poll by the Harvard School of Public Health, for instance, found that 38 percent of Americans are worried that Ebola will infect them or a family member in the next year, despite assurances that the U.S. will stop Ebola in its tracks.

We've put together a primer on what you need to know. We'll update it as new information develops.

Copyright 2014 NPR. To see more, visit http://www.npr.org/.