(NBC News) The Centers for Disease Control and Prevention is helping prepare for a new Ebola vaccine trial in Sierra Leone, the country that's now the worst hit by the Ebola epidemic.
The CDC will work with Sierra Leonean authorities to vaccinate up to 6,000 health care workers, including doctors, nurses and ambulance drivers, against a virus that's infected more than 11,000 people in Sierra Leone alone, killing 3,400 of them.
This trial will test just one of the Ebola vaccines in development - one designed by U.S. and Canadian government researchers with a company called New Link Genetics and licensed to Merck. It uses an animal virus called vesicular stomatitis virus (VSV) to carry tiny pieces of the Ebola virus to help train the immune system to recognize it.
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Ebola's infected more than 23,000 people in West Africa and killed more than 9,300 of them, according to the World Health Organization.