Innovative vaccine approaches-a Keystone Symposia report gan Cable, J, Rappuoli, R, Klemm, EJ, Kang, G, Mutreja, A, Wright, GJ, Pizza, M, Castro, SA, Hoffmann, JP, Alter, G, Carfi, A, Pollard, AJ, Krammer, F, Gupta, RK, Wagner, CE, Machado, V, Modjarrad, K, Corey, L, B Gilbert, P, Dougan, G, Lurie, N, Bjorkman, PJ, Chiu, C, Nemes, E, Gordon, SB, Steer, AC, Rudel, T, Blish, CA, Sandberg, JT, Brennan, K, Klugman, KP, Stuart, LM, Madhi, SA, Karp, CL