Viral Immunol . Assessment of S-Specific IgG and IgM Positive Rates in Healthy Hospital Staff Members Vaccinated with the Inactivated SARS-CoV-2 Vaccine

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Viral Immunol


. 2022 Feb 15.
doi: 10.1089/vim.2021.0110. Online ahead of print.
Assessment of S-Specific IgG and IgM Positive Rates in Healthy Hospital Staff Members Vaccinated with the Inactivated SARS-CoV-2 Vaccine


Lijun Zhou ^{1 2} , Dabin Liu ^{1 2} , Huihua Zhang ^{1 2} , Limei Wu ^{1 2} , Xuehui Liu ^{1 2} , Xiaoyan Wang ^{1 2} , Shuyan Liu ^{1 2} , Shaomin Yan ^{1 2} , Zhihai Li ^{1 2} , Shaoguo Wu ^{1 2 3}



Affiliations

• PMID: 35167777
• DOI: 10.1089/vim.2021.0110

Abstract

Widespread vaccination of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) vaccine makes the assessment of antibodies' positive rates essential. In this study, a total of 378 hospital staff members vaccinated with the vaccine were selected as research subjects. Serum-specific IgG and IgM against the SARS-CoV-2 spike protein (S) were detected, and S-specific IgG and IgM positive rates were analyzed in different age and sex groups, as was the serological pattern of IgG/IgM. The positive rates of IgG and IgM were 92.06% and 44.44%, respectively. The percentage of both IgG and IgM positive (IgG⁺IgM⁺) was 43.92%. A total of 182 vaccinees (46.90%) were IgG positive and IgM negative (IgG⁺IgM^-), and 28 vaccinees (7.41%) were negative for both IgG and IgM (IgG^-IgM^-); 2 participants were positive for IgM alone (IgG^-IgM⁺). In sex subgroups, the rate of IgM positivity was significantly higher in the male group than in the female group (p = 0.027). In different age subgroups, positive rates for IgG in the young group were significantly higher than those in the other group (p = 0.035). Furthermore, ratios of sample values to cutoff values (S/CO values) for IgG in vaccinees who were S-specific IgG positive were compared, and the S/CO values of IgG were significantly higher in the younger group than in the other group (p < 0.001). When comparing the influence of sex on two specific serological patterns (IgG⁺IgM^- and IgG⁺IgM⁺), a significant difference in positivity rates was detected (p = 0.011). Male vaccinees were more likely than females to have an IgG⁺IgM⁺ pattern.

Keywords: COVID-19; IgG; IgM; SARS-CoV-2; inactivated vaccine.