GMTs and seroconversion rates of neutralizing antibodies against VOCs
To analyze the neutralizing antibody titers against beta, gamma, and delta variants of concern (VOC), blood samples from participants in the CoronaVac group were detected at four time points. All participants were seronegative and susceptible to any VOCs at baseline.The GMTs and seroconversion rates of neutralizing antibodies against SARS-CoV-2 VOC were lower than those against the prototype strain (The dynamic changes of neutralizing antibody titers against SARS-CoV-2 VOCs at different time points. Participants received two doses of CoronaVac on Day 0 and Day 28 respectively and the neutralizing antibody titers were detected at four time points (Day 0, 28, 42, 56). 