Safety and immunogenicity of a bivalent SARS-CoV-2 protein booster vaccine, SCTV01C in adults previously vaccinated with inactivated vaccine: A randomized, double-blind, placebo-controlled phase 1/2 clinical trial. Issue 2 (February 2023) - Hannawi, Suad; Saifeldin, Linda; Abuquta, Alaa; Alamadi, Ahmad; Mahmoud, Sally A.; Li, Jian; Chen, Yuanxin; Xie, Liangzhi