151 two experimental ebola vaccines are being tested in liberia this week in the first largescale research trial to reach the beleaguered country since the epidemic began in 2014 the trial designed to enroll approximately 27000 healthy men and women is being led by the recently formed partnership between liberian health officials and united states national institutes of health volunteer participants are advised on how avoid infection and will be contacted by the researchers one week after the injection then monthly for the duration of the trial which is expected to last twelve months ebola outbreak life inside the hot zone ebola survivor walked through the valley of death full coverage of ebola outbreak