Ebola Could Be 'World's Next AIDS,' CDC Director Warns

Tom Frieden says 'speed' of the disease is most concerning factor

Frieden spoke at a conference at the World Bank in Washington D.C. Those in attendance included a group of African leaders from countries where the virus has spread.

"Speed is the most important variable here," Frieden said. "This is controllable and this was preventable. It's preventable by investing in core public health services, both in the epicenter of the most affected countries, in the surrounding countries, and in other countries that might be affected."

According to the WHO report, there had been 3,865 deaths as of Oct. 5 out of 8,033 confirmed cases. Those figures represents a 48 percent fatality rate.

The death of Thomas Eric Duncan, the Liberian man who was diagnosed and later died from Ebola in Dallas, was not included in those numbers. His death on Wednesday marked the first time someone in America had died from the disease.

Ashoka Mukpo, the American journalist who contracted Ebola while in Liberia and is now being treated in Nebraska, has had no changes to his condition and a spokesperson for the hospital told ABC News that his symptoms are similar to "the worst flu you can get."

Doctors in Dallas are still monitoring deputy sheriff Michael West Monnig whose condition is not consistent with the early stages of Ebola. The deputy sheriff sought medical attention because he did not feel well more than a week after going into the apartment where Duncan had been staying with relatives when he was showing symptoms.