Serological reactivity of inactivated SARS-CoV-2 vaccine based on an S-RBD neutralizing antibody assay

• Inactivated SARS-CoV-2 vaccine had good immunogenicity after 2 immunizations. • The positive rate was decreased in the BMI ≥ 25kg/m2 group. • The level of S-RBD domain antibody response was independent of sex and age. • BMI influenced the level of S-RBD domain antibodies.