1.   After years of research, scientists have identified the virus that is responsible for the disease.

2.   But all attempts to isolate and identify viruses from infected tissue proved fruitless.

3.   After several false starts, the researchers were finally able to identify the virus causing the epidemic.

4.   But a broader recommendation would take effect if laboratory workers identified the virus or if doctors diagnosed a single case somewhere in the world, he added.

5.   But identifying the viruses with any certainty is proving very tough indeed.

6.   Department of Agriculture officials identified the virus officially in October.

7.   From the Kikwit hospital, blood samples went via Belgium to the U.S. Centers for Disease Control and Prevention in Atlanta, which identified the virus as Ebola.

8.   His team is now trying to identify the virus further by using the latest molecular biology techniques on blood and other tissues from additional cases.

9.   I suspect we may wind up identifying other viruses, as well.