Wu Z, Hu Y, Xu M, Chen Z, et al. Safety, tolerability, and immunogenicity of an inactivated SARS-CoV-2 vaccine (CoronaVac) in healthy adults aged 60 years and older: a randomised, double-blind, placebo-controlled, phase 1/2 clinical trial. Lancet Infect Dis 2021 Feb 3. pii: S1473-3099(20)30987.
PMID: 33548194