Ebola Vaccines Could Be Tested In The Next Few Weeks, WHO Says.

Ebola vaccines could be tested in the next few weeks, the World Health Organization said Tuesday, as health officials try to stymie the virus that has killed more than 4,500 people.

The agency is also visiting sites in the three countries most devastated by the disease -- Sierra Leone, Guinea and Liberia -- to see which treatment centers would be able to participate in the testing of Ebola drugs, said Dr. Marie Paule Kieny, WHO's assistant director general for health systems and innovation.

The news comes a day after the Centers for Disease Control and Prevention issued updated Ebola guidelines Monday, focusing on better protecting health care workers.

CDC Director Dr. Tom Frieden stressed the importance of more training and supervision and said that no skin should be exposed when workers are wearing personal protective equipment, or PPE.

"We're increasing the margin of safety with a real consensus guideline that has three key changes. 

One, training, practicing -- demonstrated hands-on experience so that the health care workers are comfortable donning and doffing PPE. Two, no skin exposure. Three, observation of every single step, putting on and taking off the PPE," Frieden said.

Source-CNN