Journal
EBIOMEDICINE
Volume 77, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.ebiom.2022.103904
Keywords
SARS-CoV-2; mRNA vaccine; Inactivated vaccine; Cellular immune response; Humoral immune response
Funding
- Hong Kong Research Grants Council Collaborative Research Fund [C715620GF, C1134-20GF]
- Wellcome Trust [P86433]
- National Program on Key Research Project of China [2020YFC0860600, 2020YFA0707500, 2020YFA0707504]
- Shenzhen Science and Technology Program [JSGG20200225151410198, JCYJ20210324131610027]
- HKU Development Fund
- LKS Faculty of Medicine Matching Fund
- Hong Kong Innovation and Technology Fund
- Theme-Based Research Scheme [T11-706/18-N]
- Innovation and Technology Commission
Ask authors/readers for more resources
This study compares the immunogenicity and durability of BNT162b2-mRNA and CoronaVac-inactivated vaccines in fully vaccinated individuals in Hong Kong. The results show that both vaccines induce neutralizing antibodies and spike-specific CD4 T cell responses, but CoronaVac vaccine induces lower immune responses compared to BNT162b2 vaccine. Against SARS-CoV-2 variants of concern, CoronaVac vaccine shows weaker neutralizing antibody responses compared to BNT162b2 vaccine. Three months after vaccination, neutralizing antibody levels to variants of concern decrease, along with waning memory T cell responses, especially among CoronaVac vaccine recipients.
Background Nearly 4 billion doses of the BNT162b2-mRNA and CoronaVac-inactivated vaccines have been administrated globally, yet different vaccine-induced immunity against SARS-CoV-2 variants of concern (VOCs) remain incompletely investigated.& nbsp;Methods We compare the immunogenicity and durability of these two vaccines among fully vaccinated Hong Kong people.& nbsp;Findings Standard BNT162b2 and CoronaVac vaccinations were tolerated and induced neutralizing antibody (NAb) (100% and 85.7%) and spike-specific CD4 T cell responses (96.7% and 82.1%), respectively. The geometric mean NAb IC50 and median frequencies of reactive CD4 subsets were consistently lower among CoronaVac-vaccinees than BNT162b2-vaccinees. CoronaVac did not induce measurable levels of nucleocapsid protein-specific IFN-(+)(gamma) CD4+ T or IFN-(+)(gamma) CD8(+) T cells compared with unvaccinated. Against VOCs, NAb response rates and geometric mean IC50 titers against B.1.617.2 (Delta) and B.1.1.529 (Omicron) were significantly lower for CoronaVac (50%, 23.2 and 7.1%, < 20) than BNT162b2 (94.1%, 131 and 58.8%, 35.0), respectively. Three months after vaccinations, NAbs to VOCs dropped near to detection limit, along with waning memory T cell responses, mainly among CoronaVac-vaccinees.& nbsp;Interpretation Our results indicate that vaccinees especially CoronaVac-vaccinees with significantly reduced NAbs may probably face higher risk to pandemic VOCs breakthrough infection. Copyright (C)& nbsp;2022 The Authors. Published by Elsevier B.V.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available