Thomas Geisbert at UTMB is working on a vaccine known as vesicular stomatitis virus-based Ebola vaccine, or VSV, which he said had shown 100 percent efficacy in tests on animals. The shot, which has not gone through clinical trials in humans, could, he said, be issued on "compassionate grounds" to people in Guinea at risk in the current Ebola outbreak. "You have to reach a balance between advancing science, medical ethics and saving lives," he told Reuters. "It's not easy, but how many people faced with the prospect of near certain death would opt to take their chances with the virus?" The news appears widely throughout the nation, in Yahoo! News and LifeScript and other outlets.