Duration of SARS-CoV-2 Serum-Neutralizing Antibodies Against SARS-CoV-2 Dependent on the Individual.
Viral Immunol
; 36(3): 153-162, 2023 04.
Article
in English
| MEDLINE | ID: covidwho-2268724
ABSTRACT
We investigated the persistence of SARS-CoV-2-specific neutralizing antibodies in serum (CoV-2-SNAb) against the "WH-Human 1" coronavirus in 57 convalescent persons from January 2020 to January 2021. The CoV-2-SNAb response against authentic "WH-Human 1" showed a significant (p < 0.01) neutralizing high effect (≥95%) in the following manner by 94.7% neutralization for up to 6 months, by 73.1% for up to 8 months, and by 31.7% for up to 10 months in correlation with a significant decrease in the concentration of the virus determined by SARS-CoV-2 spike protein extracellular domain and spike-receptor-binding domain (S-RBD). There was neutralizing effect (<95%) when the S-RBD optical density (OD) value was more than 1.0, showing a suitable threshold of S-RBD = 1.0 (antibody-tittering, OD). However, in some convalescent persons, no neutralizing effect (<95%) was observed although the SARS-CoV-2-specific neutralizing antibodies were bound to the S-RBD (OD >1.0). The neutralization of the virus in these cases may not involve S-RBD, but rather B- and T cell memory responses in overall immunity, using the threshold value (OD = 1.0) of S-RBD as a simple and effective method to determine the neutralization effect of the antibody efficacy and use of vaccination in combination with a standard pseudovirus neutralizing assay. We suggest that convalescent persons should contact their physicians 6-month postinfection to test the function of their serum neutralizing antibodies and determine whether administering a SARS-CoV-2 vaccine is necessary to prevent the development of severe illness in the future.
Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
SARS-CoV-2
/
COVID-19
Topics:
Vaccines
Limits:
Humans
Language:
English
Journal:
Viral Immunol
Journal subject:
Allergy and Immunology
/
Virology
Year:
2023
Document Type:
Article
Affiliation country:
Vim.2022.0094
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