1. Ebola was first discovered in 1976 in Zaire (now known as the Democratic Republic of Congo).
2. Between 1976 and 2013, 20 Ebola outbreaks killed a total of 1,548 people.
3. Four strains of Ebola can infect humans. The Zaire strain is the most deadly, and is the disease spreading in this outbreak.
4. Ebola patients have to be kept in isolation wards. One problem is that West Africa lacks enough of them.
5. This is the worst Ebola outbreak ever.
6. It's spread to seven countries and killed 3,091 people - nearly twice as many as all other outbreaks combined.
7. Ebola has killed more than 200 health care workers in Africa.
8. Ebola is also spreading through unsafe burial practices in Africa.
9. The only way to catch Ebola is to have direct contact with the bodily fluids of someone who has Ebola and has begun showing symptoms.
10. Modern public health systems can stop Ebola. West Africa's poverty and underfunded health care system allowed it to spread.
11. The CDC projects as many as 1.4 million people could be infected with Ebola by January if the outbreak isn't stopped.
12. But Nigeria and Senegal stopped their Ebola outbreaks cold.
13. A Texas hospital diagnosed the first-ever American case of Ebola on September 30.
14. The United States has a robust health infrastructure that will near-certainly prevent the disease's spread.
15. There is no cure, treatment or vaccine for Ebola.