Measles may be the bigger threat partly because it is more contagious, and cases in the U.S. are already rising.

It's a virus that can strike with unrelenting force. The kind of care need to knock it out is often not fully available in a lower resource country like the Democratic Republic of Congo.

Doctors at the epicenter of the Ebola outbreak in eastern Democratic Republic of Congo told ABC News that the deadly virus is still spreading at an alarming rate.

CNN Chief International Correspondent Clarissa Ward visits Mongbwalu, a remote gold-mining town in eastern Congo, where this latest Ebola outbreak is believed to have originated.

BUNIA, Congo — The rare Bundibugyo type of Ebola that Congo is battling took locals by surprise after weeks of spreading unnoticed. Hundreds of cases were suspected when the outbreak was declared in May, but many dismissed the news as a “Western conspiracy.”

The CDC on Saturday added two more airports that travelers to the United States can be routed through for Ebola screening when entering the country.

The International Rescue Committee warned the Ebola outbreak in the Democratic Republic of the Congo and Uganda is spreading faster than responders can contain it.

The Ebola outbreak in Central Africa could grow to 20,000 cases or more, depending on how quickly infected people are isolated to slow the spread

Houston will be one of three airports designated to screen passengers traveling from certain countries into the U.S. as the Ebola outbreak spreads

The U.S. government is requiring travelers who have visited African countries where Ebola outbreaks are occurring within the last three weeks to go through enhanced screening at Washington Dulles International Airport (IAD).