A woman gets vaccinated on March 10, 2015 at a health center in Conakry during the first clinical trials of the VSV-EBOV vaccine against the Ebola virus. The World Health Organization (WHO) said on March 5 that clinical trials launched on March 7 in Guinea marked the last step before the vaccine is available on the market.                                     AFP PHOTO / CELLOU BINANI        (Photo credit should read CELLOU BINANI/AFP/Getty Images)