What will it take to get a vaccine for the Ebola strain driving the current outbreak?

Article excerpt

An effective Ebola vaccine exists, but it doesn't work against the Sudan strain ravaging the Democratic Republic of Congo. The outbreak has killed hundreds as health officials race to test several candidate vaccines that might stop the virus. Trials are underway, but experts face a familiar problem: developing and distributing a vaccine fast enough to contain a disease that spreads faster than bureaucracy typically moves. The question isn't whether a vaccine is possible, it's whether one can be ready in time.