USA TODAY by Liz Sazbo Feb. 17, 2015
The unpredictable Ebola outbreak in West Africa is thwarting health officials' best efforts both to contain the epidemic, as well as test new treatments and vaccines.
Biologist Olivier Mbaya works with serum samples from healthy volunteer participants in a European study of an experimental Ebola vaccine,, at the Vaccine Research Center at the National Institutes of Health in Bethesda, Md., Wednesday, Feb. 4, 2015. (Photo: Cliff Owen, AP)
The number of new Ebola cases has risen sharply in the West African nation of Guinea, for example, even as researchers wonder if there will be enough patients in neighboring Liberia to test experimental vaccines.
Just a few weeks ago, the number of new Ebola cases was falling in all three West African countries....