Vaccines
Trial vaccines included CoronaVac (Vero Cell; Beijing Sinovac Research & Development, Beijing, China) and Covilo (Vero Cell; Beijing Institute of Biological Products Co., Beijing, China), which are inactivated whole virion vaccines to wild-type SARS-CoV-2 with aluminum hydroxide as the adjuvant, administered intramuscularly at 0.5 mL per dose. Convidecia (CanSino Biologics, Tianjin, China) is a replication-defective Ad5-vectored vaccine expressing the full-length spike gene of wild-type SARS-CoV-2 (WuhanHu-1) supplied as a liquid formulation with a concentration of 5 × 10