Effectiveness of mRNA-BNT162b2, mRNA-1273, and ChAdOx1 nCoV-19 vaccines against COVID-19 in healthcare workers: an observational study using surveillance data
Open accessAbstract
Objectives Healthcare workers (HCWs) at increased risk of coronavirus disease 2019 (COVID-19) were among the primary targets for vaccine campaigns. We aimed to estimate the protective efficacy of the first three COVID-19 vaccines available in Western Europe.Methods We merged two prospective databases that systematically recorded, in our institution: (a) HCWs positive for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) by RT-PCR on nasopharyngeal samples, and (b) HCWs who received at least one dose of COVID-19 vaccine. We excluded HCWs with SARS-CoV-2 infection during the 6 months prior to the study. HCWs were categorized as non-vaccinated if they received no vaccine and until the first injection +13 days, partially vaccinated from the first injection +14 days to the second injection +13 days, and fully vaccinated thereafter.Results Of the 8165 HCWs employed in our institution, 360 (4.4%) tested positive for SARS-CoV-2 by RT-PCR during the study period (4th January to 17th May 2021). Incidence was 9.1% (8.2-10.0) in non-vaccinated HCWs, 1.2% (0.7-1.9) after one dose of ChAdOx1 nCoV-19, 1.4% (0.6-2.3) and 0.5% (0.1-1.0) after one and two doses of mRNA BNT162b2, 0.7% (0.1-1.9) and 0% after one and two doses of mRNA-1273 (p < 0.0001). Vaccine effectiveness (Cox model) was estimated at, respectively, 86.2% (76.5-91.0), 38.2% (6.3-59.2), and 49.2% (19.1-68.1) 14 days after the first dose for ChAdOx1 nCoV-19, mRNA-1273, and mRNA-BNT162b2, and 100% (ND) and 94.6% (61.0-99.2) 14 days after the second dose for mRNA-1273 and mRNA-BNT162b2.Conclusions In this real-world study, the observed effectiveness of COVID-19 vaccines in HCWs was in line with the efficacy reported in pivotal randomized trials.
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mRNA-1273 is still quite effective in congregate settings or higher-risk exposure such as prisons or hospitals where the Delta variant was prevalent.
“Other studies have shown that mRNA-1273 is still quite effective in congregate settings or higher-risk exposure such as prisons or hospitals in which the Delta variant was prevalent.419,420”
From Advances in COVID-19 mRNA vaccine development (2022) · cites this paper as [420]
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- Authors
- Paris, C., Perrin, S., Hamonic, S., Bourget, B., Roué, C., Brassard, O., Tadié, E., Gicquel, V., Bénézit, F., Thibault, V., Garlantézec, R., & Tattevin, P.
- Affiliations
- Inserm (FR)
- Hôpital Pontchaillou (FR)
- Corresponding author
- Paris, Christophe
- Venue
- Clinical Microbiology and Infection
- Publisher
- Elsevier BV
- Published
- 2021-11
- Volume
- 27
- Issue
- 11
- Pages
- 1699.e5-1699.e8
- ISSN
- 1198-743X (ISSN-L)
- PMC
- PMC8275842
- OpenAlex
- W3182163984
- Cited by
- 62
- References
- 9
- Citations by year
- 2026: 2 · 2025: 3 · 2024: 4 · 2023: 14 · 2022: 28 · 2021: 11
- FWCI
- 4.51
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Clinical Microbiology and Infection (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- HAL (submittedVersion, other-oa)
- Topics
- Health Sciences › Medicine › Infectious Diseases › SARS-CoV-2 and COVID-19 Research
- Social Sciences › Health › Vaccine Coverage and Hesitancy
- Physical Sciences › Mathematics › Modeling and Simulation › COVID-19 epidemiological studies
- Keywords
- COVID-19 vaccines, SARS-CoV-2, healthcare workers, vaccine effectiveness, mRNA-1273, ChAdOx1 nCoV-19 vaccine, breakthrough infection, occupational infection risk, SARS-CoV-2 incidence, surveillance data, Cox proportional hazards model, vaccine hesitancy
- MeSH terms
- COVID-19, COVID-19 Vaccines, mRNA Vaccines, BNT162 Vaccine, 2019-nCoV Vaccine mRNA-1273, ChAdOx1 nCoV-19, Health Personnel, Humans, Vaccines, Synthetic
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