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Dyu T, Leung C, Simões-E-Silva AC. Effectiveness of AstraZeneca vaccine against SARS-CoV-2 (ChAdox1-S) in reducing in-hospital mortality in individuals with COVID-19 and schizophrenia: A retrospective cohort study. Hum Vaccin Immunother 2024; 20:2379865. [PMID: 39056147 DOI: 10.1080/21645515.2024.2379865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2024] [Revised: 07/01/2024] [Accepted: 07/10/2024] [Indexed: 07/28/2024] Open
Abstract
ChAdOx1-S is a viral vector vaccine developed by AstraZeneca. We aimed to assess the effectiveness of 1 and 2 doses of the ChAdOx1-S vaccine in reducing COVID-19-related in-hospital mortality in individuals with schizophrenia. This is a retrospective cohort study using a nationwide hospital database in Brazil. Individuals diagnosed with COVID-19 and schizophrenia were included in the study. The exposures were 0, 1, and 2 doses of ChAdOx1-S. The outcome of mortality was measured in hazard ratios (HR), calculated using multivariable Cox regression models. The study included 1,929 positive cases of COVID-19 in schizophrenia patients. After adjusting for age, socioeconomic factors, and comorbidities, we observed a significant 55% decrease in the hazard of mortality in the 2-dose vaccination group (HR 0.45, 95% CI: 0.310-0.652) compared to the unvaccinated. Surprisingly, our results did not show any significant reduction in the hazard of mortality in the 1 dose vaccination group (HR 1.278, 95% CI: 0.910-1.795). The effectiveness of two doses of ChAdOx1-S in individuals with schizophrenia aligns with findings from studies on the general population. That one dose was insignificant. Overall, these findings are important for informing public health decisions - prioritizing individuals with schizophrenia for vaccinations and managing acceptance of vaccines.
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Affiliation(s)
- Tiffany Dyu
- School of Biological Sciences, University of Leicester, Leicester, UK
| | - Char Leung
- Department of Population Health Sciences, University of Leicester, Leicester, UK
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Guarducci G, Mereu G, Golinelli D, Galletti G, Gemmi F, Cartocci A, Holczer N, Bacci L, Sergi A, Messina G, Mari V, Nante N. Factors Influencing the Healthcare Workers' Willingness to Receive the COVID-19 Booster Dose in Tuscany (Italy). Vaccines (Basel) 2023; 11:1751. [PMID: 38140156 PMCID: PMC10748028 DOI: 10.3390/vaccines11121751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 11/21/2023] [Accepted: 11/22/2023] [Indexed: 12/24/2023] Open
Abstract
BACKGROUND The World Health Organization has defined vaccine hesitancy as behavior influenced by several factors, including trust in the vaccine itself or its provider or the perceived need for vaccination. The aim of this study was to investigate the factors influencing the willingness to receive the COVID-19 vaccine among the employees and healthcare professionals of the Central Tuscany Local Health Authority (CT-LHA) in Italy. METHODS From July to October 2022, a cross-sectional study was conducted. An online questionnaire was administered to 7000 employees of the CT-LHA. The questionnaire analyzed the factors that influenced receiving the booster dose of the COVID-19 vaccine. The sample was stratified by gender, age, type of occupation (healthcare or non-healthcare workers), and seniority. Incomplete questionnaires were excluded. A chi-squared test was performed through STATA. The significance level was set at 95%. RESULTS Of the questionnaires administered, 1885 (26.9%) questionnaires were eligible for the study. In the previous vaccination campaign, the healthcare workers (HCWs) considered the vaccine used by CT-LHA as safe, in contrast to non-healthcare workers (N-HCWs), who considered it less secure (p < 0.05). The HCWs showed a higher propensity for vaccine safety to receive the booster dose than N-HCWs. N-HCWs appeared to be less affected by an updated booster dose than HCWs (p < 0.05). CONCLUSIONS The factors studied appear to influence HCWs differently from N-HCWs. Both HCWs and N-HCWs would choose an upgraded mRNA vaccine for the booster dose.
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Affiliation(s)
- Giovanni Guarducci
- Post Graduate School of Public Health, University of Siena, 53100 Siena, Italy; (D.G.); (G.M.); (N.N.)
| | - Giovanna Mereu
- Department of Technical Health Professions, Central Tuscany Local Health Authority, 50121 Florence, Italy;
| | - Davide Golinelli
- Post Graduate School of Public Health, University of Siena, 53100 Siena, Italy; (D.G.); (G.M.); (N.N.)
- Department of Molecular and Developmental Medicine, University of Siena, 53100 Siena, Italy
| | - Giacomo Galletti
- Quality and Equity Unit, Regional Health Agency of Tuscany, 50141 Florence, Italy; (G.G.); (F.G.)
| | - Fabrizio Gemmi
- Quality and Equity Unit, Regional Health Agency of Tuscany, 50141 Florence, Italy; (G.G.); (F.G.)
| | - Alessandra Cartocci
- Department of Medical Biotechnologies, University of Siena, 53100 Siena, Italy;
| | - Nora Holczer
- General Direction, Central Tuscany Local Health Authority, 50121 Florence, Italy (V.M.)
| | - Luca Bacci
- Web Communication and Promotion, Central Tuscany Local Health Authority, 50121 Florence, Italy;
| | - Alessandro Sergi
- Healthcare Management, Central Tuscany Local Health Authority, 50121 Florence, Italy;
| | - Gabriele Messina
- Post Graduate School of Public Health, University of Siena, 53100 Siena, Italy; (D.G.); (G.M.); (N.N.)
- Department of Molecular and Developmental Medicine, University of Siena, 53100 Siena, Italy
| | - Valerio Mari
- General Direction, Central Tuscany Local Health Authority, 50121 Florence, Italy (V.M.)
| | - Nicola Nante
- Post Graduate School of Public Health, University of Siena, 53100 Siena, Italy; (D.G.); (G.M.); (N.N.)
- Department of Molecular and Developmental Medicine, University of Siena, 53100 Siena, Italy
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