Human challenge trials in vaccine development, Rockville, MD, USA, September 28–30, 2017 by Baay, M, Richie, T, Neels, P, Cavaleri, M, Chilengi, R, Diemert, D, Hoffman, S, Johnson, R, Kirkpatrick, B, Knezevic, I, Laurens, M, McShane, H, Njuguna, P, Older Aguilar, A, Pollard, A, Riddle, M, Sauerwein, R, Southern, J, Tribble, D, Wildfire, A