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Expansion of SARS-CoV-2-specific Antibody-secreting Cells and Generation of Neutralizing Antibodies in Hospitalized COVID-19 Patients

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TLDR
This study observed a significant expansion of SARS-CoV-2 nucleocapsid protein-specific ASCs in all twenty COVID-19 patients using a multicolor FluoroSpot assay, and found that Sars-Cov-2-specific IgA, IgG and IgM antibody levels positively correlated with SARS -CoV -2-neutralizing antibody titers.
Abstract
COVID-19, caused by SARS-CoV-2, emerged in late 2019 and has since become a global pandemic. Pathogen-specific antibodies are typically a major predictor of protective immunity, yet B cell and antibody responses during COVID-19 are not fully understood. Here, we analyzed antibody-secreting cell (ASC) and antibody responses in twenty hospitalized COVID-19 patients. We observed a significant expansion of SARS-CoV-2 nucleocapsid protein-specific ASCs in all twenty COVID-19 patients using a multicolor FluoroSpot assay. Out of the 20 patients, 16 had developed SARS-CoV-2-neutralizing antibodies by the time of sampling. Additionally, we found that SARS-CoV-2-specific IgA, IgG and IgM antibody levels positively correlated with SARS-CoV-2-neutralizing antibody titers. This study constitutes a detailed description of B cell and antibody responses to SARS-CoV-2 in COVID-19, and provides tools to study immune responses to SARS-CoV-2 infection and vaccination.

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Laboratory diagnosis of coronavirus disease-2019 (COVID-19).

TL;DR: This review will discuss the performance of different laboratory diagnostic tests and platforms, as well as suitable clinical samples for testing, and related biosafety protection, for the diagnosis of COVID-19 caused by SARS-CoV-2.
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Broad anti-SARS-CoV-2 antibody immunity induced by heterologous ChAdOx1/mRNA-1273 vaccination

TL;DR: The results provide molecular insight into the enhanced quality of the B cell response induced after heterologous mRNA booster vaccination, and examine the immunity induced by either prime and boost with the adenoviral vectored vaccine ChAd Ox1 or prime with ChAdOx1 andBoost with a messenger RNA (mRNA) vaccine.
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Evaluation of safety and immunogenicity of receptor-binding domain-based COVID-19 vaccine (Corbevax) to select the optimum formulation in open-label, multicentre, and randomised phase-1/2 and phase-2 clinical trials

TL;DR: A randomised Phase-1/2 trial followed by a Phase-2 trial were conducted to assess the safety and immunogenicity of the COVID-19 vaccine Corbevax and select to an optimum formulation as discussed by the authors .
References
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Human Ebola virus infection results in substantial immune activation

TL;DR: Sustained immune activation after the virus was cleared from the plasma is found, observed most strikingly in the persistence of activated CD8 T cells, even 1 mo after the patients’ discharge from the hospital, suggesting continued antigen stimulation after resolution of the disease.
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Blood-borne human plasma cells in steady state are derived from mucosal immune responses

TL;DR: It is shown that plasmablasts and plasma cells are always detectable in human blood at low frequency in any unimmunized donor, indicating that mucosal and systemic humoral immune responses are regulated independent of each other.
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Rapid and massive virus specific plasmablast responses during acute dengue virus infection in humans

TL;DR: Very potent plasmablast responses that often increased more than 1,000-fold over the baseline levels in healthy volunteers are found, raising the question as to whether these cells might have a role in dengue immunopathology during the ongoing infection.
Journal ArticleDOI

Origin and Function of Circulating Plasmablasts during Acute Viral Infections

TL;DR: This review summarizes what is known about the phenotype and the origin of human plasmablasts in the context of viral infections and whether these cells can be predictors of long-lived immunity.
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What are Covid antibody levels after vaccine?

SARS-CoV-2-specific IgA, IgG and IgM antibody levels positively correlated with SARS-CoV-2-neutralizing antibody titers, suggesting that SARS-CoV-2-specific antibody levels may reflect the titers of neutralizing antibodies in COVID-19 patients during the acute phase of infection.