ArticleBMC medicine2022
Humoral immune response after different SARS-CoV-2 vaccination regimens.
Article in BMC medicine, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 49 papers, 1 of them a synthesis that pooled it.
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Who cites it
49 citing papers in PubMed, 1 synthesis or guideline pooled it, 65 citations in OpenAlex.
- Antibody titers of individuals vaccinated for COVID-19: A systematic review.Journal of biosciences · 2023Pooled it
- Longitudinal study of the immunological response to the SARS-CoV-2 vaccine in Instituto Português de Oncologia of Coimbra professionals.IJID regions · 2026Article
- Graphene quantum dot-coated mesoporous silica loaded with glucosamine sulfate as a potent antigen delivery system for immunoactivation.Communications biology · 2026Article
- The Ability of Serum Amyloid A to Discriminate Coronavirus Disease 2019 (COVID-19) Patients Who Stay Moderately Ill Versus Patients Who Become Severely Ill.Journal of clinical laboratory analysis · 2026Article
- Longitudinal Antibody Dynamics Following SARS-CoV-2 Viral-Vectored and mRNA Booster Vaccination in Ghanaian Adults.Vaccines · 2026Article
- Cellular Immune Response Induced by mRNA Vaccines Against SARS-CoV-2.Immunity, inflammation and disease · 2026Review
- The vaccine platform used for COVID-19 primary immunization shapes the quality of the human B cell response to a vaccine boost.Science translational medicine · 2026Article
- Quantification of the IgG antibody response half-life for hybrid immunity to SARS-CoV-2.BMC medicine · 2025Article
- Differential reactivity of SARS-CoV-2 S-protein T-cell epitopes in vaccinated versus naturally infected individuals.Clinical & translational immunology · 2025Article
- Mechanistic models of humoral kinetics following COVID-19 vaccination.Journal of the Royal Society, Interface · 2025Article
- Longitudinal analysis of SARS-CoV-2 IgG antibody durability in Puerto Rico.Scientific reports · 2024Article
- Greater preservation of SARS-CoV-2 neutralising antibody responses following the ChAdOx1-S (AZD1222) vaccine compared with mRNA vaccines in haematopoietic cell transplant recipients.British journal of haematology · 2024Article
- Longitudinal Evaluation of Severe Acute Respiratory Syndrome Coronavirus 2 T-Cell Immunity Over 2 Years Following Vaccination and Infection.The Journal of infectious diseases · 2024Article
- Adverse events associated with AstraZeneca COVID-19 vaccine among adults in Greater Kampala, Uganda: a cross-sectional study.African health sciences · 2024Article
- The varying extent of humoral and cellular immune responses to either vector- or RNA-based SARS-CoV-2 vaccines persists for at least 18 months and is independent of infection.Journal of virology · 2024Article
- Article
- Whole Blood as a Sample Matrix in Homogeneous Time-Resolved Assay-Förster Resonance Energy Transfer-Based Antibody Detection.Diagnostics (Basel, Switzerland) · 2024Article
- Covid-19 vaccines elicit effective IgG responses in an elderly thymus cancer patient with chemotherapy.Human vaccines & immunotherapeutics · 2023Article
- Article
- COVID-19 Adenoviral Vector Vaccination Elicits a Robust Memory B Cell Response with the Capacity to Recognize Omicron BA.2 and BA.5 Variants.Journal of clinical immunology · 2023Article
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Authors and funding
6 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundThe humoral immune response after primary immunisation with a SARS-CoV-2 vector vaccine (AstraZeneca AZD1222, ChAdOx1 nCoV-19, Vaxzevria) followed by an mRNA vaccine boost (Pfizer/BioNTech, BNT162b2; Moderna, m-1273) was examined and compared with the antibody response after homologous vaccination schemes (AZD1222/AZD1222 or BNT162b2/BNT162b2).
methodsSera from 59 vaccinees were tested for anti-SARS-CoV-2 immunoglobulin G (IgG) and virus-neutralising antibodies (VNA) with three IgG assays based on (parts of) the SARS-CoV-2 spike (S)-protein as antigen, an IgG immunoblot (additionally contains the SARS-CoV-2 nucleoprotein (NP) as an antigen), a surrogate neutralisation test (sVNT), and a Vero-cell-based virus-neutralisation test (cVNT) with the B.1.1.7 variant of concern (VOC; alpha) as antigen. Investigation was done before and after heterologous (n = 30 and 42) or homologous booster vaccination (AZD1222/AZD1222, n = 8/9; BNT162b2/BNT162b2, n = 8/8). After the second immunisation, a subgroup of 26 age- and gender-matched sera (AZD1222/mRNA, n = 9; AZD1222/AZD1222, n = 9; BNT162b2/BNT162b2, n = 8) was also tested for VNA against VOC B.1.617.2 (delta) in the cVNT. The strength of IgG binding to separate SARS-CoV-2 antigens was measured by avidity.
resultsAfter the first vaccination, the prevalence of IgG directed against the (trimeric) SARS-CoV-2 S-protein and its receptor binding domain (RBD) varied from 55-95% (AZD1222) to 100% (BNT162b2), depending on the vaccine regimen and the SARS-CoV-2 antigen used. The booster vaccination resulted in 100% seroconversion and the occurrence of highly avid IgG, which is directed against the S-protein subunit 1 and the RBD, as well as VNA against VOC B.1.1.7, while anti-NP IgGs were not detected. The results of the three anti-SARS-CoV-2 IgG tests showed an excellent correlation to the VNA titres against this VOC. The agreement of cVNT and sVNT results was good. However, the sVNT seems to overestimate non- and weak B.1.1.7-neutralising titres. The anti-SARS-CoV-2 IgG concentrations and the B.1.1.7-neutralising titres were significantly higher after heterologous vaccination compared to the homologous AZD1222 scheme. If VOC B.1.617.2 was used as antigen, significantly lower VNA titres were measured in the cVNT, and three (33.3%) vector vaccine recipients had a VNA titre < 1:10.
conclusionsHeterologous SARS-CoV-2 vaccination leads to a strong antibody response with anti-SARS-CoV-2 IgG concentrations and VNA titres at a level comparable to that of a homologous BNT162b2 vaccination scheme. Irrespective of the chosen immunisation regime, highly avid IgG antibodies can be detected just 2 weeks after the second vaccine dose indicating the development of a robust humoral immunity. The reduction in the VNA titre against VOC B.1.617.2 observed in the subgroup of 26 individuals is remarkable and confirms the immune escape of the delta variant.
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