{Reference Type}: Journal Article
{Title}: Dynamic observation of SARS-CoV-2 IgM, IgG, and neutralizing antibodies in the development of population immunity through COVID-19 vaccination.
{Author}: Jiang R;Dou X;Li M;Wang E;Hu J;Xiong D;Zhang X;Jiang R;Dou X;Li M;Wang E;Hu J;Xiong D;Zhang X;Jiang R;Dou X;Li M;Wang E;Hu J;Xiong D;Zhang X;
{Journal}: J Clin Lab Anal
{Volume}: 36
{Issue}: 4
{Year}: Apr 2022
{Factor}: 3.124
{DOI}: 10.1002/jcla.24325
{Abstract}: <B>BACKGROUND: </B>Currently, mass vaccine inoculation against coronavirus disease-2019 (COVID-19) has been being implemented globally. Rapid and the large-scale detection of serum neutralizing antibodies (NAbs) laid a foundation for assessing the immune response against SARS-CoV-2 infection and vaccine. Additional assessments include the duration of antibodies and the optimal time for a heightened immune response.<BR><B>METHODS: </B>The performance of five surrogate NAbs-three chemiluminescent immunoassay (CLIA) and two enzyme-linked immunosorbent assays (ELISAs)-and specific IgM and IgG assays were compared using COVID-19-vaccinated serum (n = 164). Conventional virus neutralization test (cVNT) was used as a criterion and the diagnostic agreement and correlation of the five assays were evaluated. We studied the antibody responses after the two-dose vaccine in volunteers up to 6 months.<BR><B>RESULTS: </B>The sensitivity and specificity of five surrogate NAb assays ranged from 84% to 100%. Our cVNT results indicated great consistency with the surrogate assays. At 28 days after primary vaccination, the seropositivities of the NAbs, IgG, and IgM were 6%, 4%, and 13%, respectively. After the booster dose, seropositivities reached 14%, 65%, and 97%, respectively. Six months after receipt of the second dose, the NAb positive rate was eventually maintained at 66%. In all COVID-19 convalescents, patients were detected with 100% NAb sat three months after discharge.<BR><B>CONCLUSIONS: </B>COVID-19 vaccine induced a humoral immune response lasting at least six months. Rapid serological detection was used as a proxy for identifying changes in immunity levels and as a guide to whether an individual may require a booster vaccination.