Article ; Online: Immune responses to a single dose of the AZD1222/Covishield vaccine in health care workers.
2021 Volume 12, Issue 1, Page(s) 4617
Abstract: ... of a single dose of the AZD1222 vaccine, at one month, in a cohort of health care workers (HCWs) (629 naïve ... This study shows high seroconversion after one vaccine dose, but also suggests that one vaccine dose may be ... higher than to RBD of B.1.1.7, and titres to B.1.351 were very low. Ex vivo T cell responses were ...
| Abstract | Several COVID-19 vaccines have received emergency approval. Here we assess the immunogenicity of a single dose of the AZD1222 vaccine, at one month, in a cohort of health care workers (HCWs) (629 naïve and 26 previously infected). 93.4% of naïve HCWs seroconverted, irrespective of age and gender. Haemagglutination test for antibodies to the receptor binding domain (RBD), surrogate neutralization assay (sVNT) and ex vivo IFNγ ELISpot assays were carried out in a sub-cohort. ACE2 blocking antibodies (measured by sVNT) were detected in 67/69 (97.1%) of naïve HCWs. Antibody levels to the RBD of the wild-type virus were higher than to RBD of B.1.1.7, and titres to B.1.351 were very low. Ex vivo T cell responses were observed in 30.8% to 61.7% in naïve HCWs. Previously infected HCWs, developed significantly higher (p < 0.0001) ACE2 blocking antibodies and antibodies to the RBD for the variants B.1.1.7 and B.1.351. This study shows high seroconversion after one vaccine dose, but also suggests that one vaccine dose may be insufficient to protect against emerging variants. |
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| MeSH term(s) | Adult ; Antibodies, Neutralizing/biosynthesis ; Antibodies, Neutralizing/immunology ; COVID-19/immunology ; COVID-19/prevention & control ; COVID-19/virology ; COVID-19 Vaccines/therapeutic use ; ChAdOx1 nCoV-19 ; Dose-Response Relationship, Immunologic ; Female ; Health Personnel ; Humans ; Immunity ; Male ; Middle Aged ; SARS-CoV-2/immunology ; SARS-CoV-2/isolation & purification ; Young Adult |
| Chemical Substances | Antibodies, Neutralizing ; COVID-19 Vaccines ; ChAdOx1 nCoV-19 (B5S3K2V0G8) |
| Language | English |
| Publishing date | 2021-07-29 |
| Publishing country | England |
| Document type | Journal Article ; Research Support, Non-U.S. Gov't |
| ZDB-ID | 2553671-0 |
| ISSN | 2041-1723 ; 2041-1723 |
| ISSN (online) | 2041-1723 |
| ISSN | 2041-1723 |
| DOI | 10.1038/s41467-021-24579-7 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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