In Search of an Ebola Vaccine
Because of this danger, the U.S. Government is making the development of an Ebola vaccine a priority, according to Scientific American. The vaccine appears to be effective in mice and monkeys, but there's currently no safe way to test it in humans. Another unknown is how long immunity will last; current vaccine batches protect for only about a month.
Even though a viable, commercial Ebola vaccine might not be available for years, the Department of Homeland Security may stockpile early versions nonetheless, bargaining that in a bioterror emergency, a questionable vaccine would be better than no vaccine at all.