UTMB’s Tom Geisbert shared his expertise in Ebola vaccine development with the VOA. A vaccine candidate is currently being tested in Guinea, where the Ebola virus is still active. Geisbert was one of the researchers who developed this potential vaccine. Despite reports that researchers are closing in on an effective vaccine, he says there's still a lot of work to do. "A lot of the different vaccines and treatments were developed against one species of Ebola, and a particular strain of that species, so there are five different species of Ebola virus, said Geisbert. "Three of those cause disease, morbidity and mortality in man." He says a vaccine that might work against the Zaire Ebola virus, the species circulating in west Africa, might not work against against another type of deadly Ebola virus