RH5.1-CyRPA-Ripr antigen combination vaccine shows little improvement over RH5.1 in a preclinical setting Por Healer, J, Thompson, JK, Mackwell, KL, Browne, CD, Seager, BA, Ngo, A, Lowes, KN, Silk, SE, Pulido, D, King, LDW, Christen, JM, Noe, AR, Kotraiah, V, Masendycz, PJ, Rajagopalan, R, Lucas, L, Stanford, MM, Soisson, L, Diggs, C, Miller, R, Youll, S, Wycherley, K, Draper, SJ, Cowman, AF