Figure 2 Correlation between neutralization antibody titers and IgG titers by ELISA. Anti-SARS-CoV-2 S IgG was determined using ELISA and neutralization antibody titers were determined by pseudovirus-based neutralization assay. A line of best fit was estimated by linear regression using log-transformed values for the IgG titers and neutralizaiton antibody titers. A. The correlation analysis between IgG titers against S protein of SARS-Cov-2 prototype and neutralization antibody titers against pseutyped SARS-Cov-2 prototype.B. The correlation analysis between IgG titers against S protein of SARS-Cov-2 Omicron BA.1 and neutralization antibody titers against pseutyped SARS-Cov-2 Omicron BA.1. C. The correlation analysis between IgG titers against S protein of SARS-Cov-2 Omicron BA.5 and neutralization antibody titers against pseutyped SARS-Cov-2 Omicron BA.5.rs , Spearman rank-order correlation coefficient.
Table 1 Agreement between IgG titers by ELISA and neutralization titers using pseudotyped SARS CoV-2 variants in 88 sera samples immunized with three doses of COVID-19-inactivated vaccine