Researchers will conduct human tests on a third possible Ebola vaccine in response to the U.N.'s call to fast-track treatments for the worst known outbreak of the deadly virus in human history, NBC News reported. Johnson & Johnson said in a statement early Thursday that the tests would begin early next year. GlaxoSmithKline has already said it will begin trials this month on its potential vaccine, and trials on a vaccine being developed by the Canadian government could begin later this year.