Serum total antibodies; IgG antibodies; and neutralizing antibodies of SARS-CoV-2 one month after the last dose of vaccination (if the total antibodies against SARS-CoV-2 are positive; the positive conversion rate and antibody levels of IgG and neutralizing antibodies will be further tested);The positive conversion rate and antibody level of SARS-CoV-2 total antibody; IgA antibody; and neutralizing antibody in nasopharyngeal swabs (if the total anti- SARS-CoV-2 antibody is positive; the IgA antibody and neutralizing antibody will be further tested) one month after the last dose of vaccination;The specific cellular immune response level of SARS-CoV-2 spike protein in whole blood 14 days after the last dose of vaccination ;

Serum total antibodies; IgG antibodies; and neutralizing antibodies of SARS-CoV-2 one month after the last dose of vaccination (if the total antibodies against SARS-CoV-2 are positive; the positive conversion rate and antibody levels of IgG and neutralizing antibodies will be further tested);The positive conversion rate and antibody level of SARS-CoV-2 total antibody; IgA antibody; and neutralizing antibody in nasopharyngeal swabs (if the total anti- SARS-CoV-2 antibody is positive; the IgA antibody and neutralizing antibody will be further tested) one month after the last dose of vaccination;The specific cellular immune response level of SARS-CoV-2 spike protein in whole blood 14 days after the last dose of vaccination ;