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Chivu CD, Crăciun MD, Pițigoi D, Aramă V, Luminos ML, Jugulete G, Constantin C, Apostolescu CG, Streinu Cercel A. The Dynamic Risk of COVID-19-Related Events in Vaccinated Healthcare Workers (HCWs) from a Tertiary Hospital in Bucharest, Romania: A Study Based on Active Surveillance Data. Vaccines (Basel) 2024; 12:182. [PMID: 38400165 PMCID: PMC10891893 DOI: 10.3390/vaccines12020182] [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: 12/22/2023] [Revised: 02/03/2024] [Accepted: 02/10/2024] [Indexed: 02/25/2024] Open
Abstract
Our study describes the frequency and severity of COVID-19 in HCWs and estimates the dynamic risk of COVID-19-related events. We actively surveyed all HCWs from a tertiary infectious disease hospital from 26 February 2020 to 31 May 2023. Of 1220 HCWs, 62.9% (767) had at least one COVID-19 episode. The under 29 years (p = 0.0001) and 40-49 years (p = 0.01) age groups, nurses (p = 0.0001), and high-risk departments (p = 0.037) were characteristics significantly more frequent in HCWs with COVID-19 history. A higher percentage of boosters (53.2%; p < 0.0001) were registered in the uninfected group. The second episode of COVID-19 was significantly milder than the first. Data regarding clinical outcomes from 31 January 2021 to 31 May 2023 were analyzed in a follow-up study to determine the risk of COVID-19-related events. The Cox regression analysis revealed that HCWs with booster shots had a lower risk of COVID-19 across all events, symptomatic events, and moderate to severe events as adjusted hazard ratio (aHR) were: 0.71 (95%CI: 0.54-0.96), 0.23 (95%CI: 0.12-0.46), and 0.17 (95%CI: 0.07-0.43), respectively. Within the vaccinated subgroup, the HCWs with hybrid immunity and booster had aHR for all followed-up events of 0.42 (95%CI: 0.30-0.58), for symptomatic events of 0.52 (95%CI: 0.36-0.74), and 0.15 (95%CI: 0.03-0.66) for moderate to severe events. The risk of COVID-19 clinical events was lower for HCWs with at least one booster than those completely vaccinated.
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Affiliation(s)
- Carmen-Daniela Chivu
- Department of Epidemiology 1, Carol Davila University of Medicine and Pharmacy, 050474 Bucharest, Romania; (C.-D.C.); (D.P.)
- Emergency Clinical Hospital for Children “Grigore Alexandrescu”, 011743 Bucharest, Romania
| | - Maria-Dorina Crăciun
- Department of Epidemiology 1, Carol Davila University of Medicine and Pharmacy, 050474 Bucharest, Romania; (C.-D.C.); (D.P.)
- Emergency Clinical Hospital for Children “Grigore Alexandrescu”, 011743 Bucharest, Romania
| | - Daniela Pițigoi
- Department of Epidemiology 1, Carol Davila University of Medicine and Pharmacy, 050474 Bucharest, Romania; (C.-D.C.); (D.P.)
- National Institute for Infectious Diseases “Prof. Dr. Matei Balș”, 021105 Bucharest, Romania; (V.A.); (M.L.L.); (G.J.); (C.G.A.); (A.S.C.)
| | - Victoria Aramă
- National Institute for Infectious Diseases “Prof. Dr. Matei Balș”, 021105 Bucharest, Romania; (V.A.); (M.L.L.); (G.J.); (C.G.A.); (A.S.C.)
- Department of Infectious Diseases 1, Carol Davila University of Medicine and Pharmacy, 020021 Bucharest, Romania
| | - Monica Luminița Luminos
- National Institute for Infectious Diseases “Prof. Dr. Matei Balș”, 021105 Bucharest, Romania; (V.A.); (M.L.L.); (G.J.); (C.G.A.); (A.S.C.)
- Department of Infectious Diseases 3, Carol Davila University of Medicine and Pharmacy, 020021 Bucharest, Romania
| | - Gheorghiță Jugulete
- National Institute for Infectious Diseases “Prof. Dr. Matei Balș”, 021105 Bucharest, Romania; (V.A.); (M.L.L.); (G.J.); (C.G.A.); (A.S.C.)
- Department of Infectious Diseases 3, Carol Davila University of Medicine and Pharmacy, 020021 Bucharest, Romania
| | - Ciprian Constantin
- Department of Clinical Sciences, Faculty of Medicine, Titu Maiorescu University, 031593 Bucharest, Romania;
- Carol Davila Central Military Emergency University Hospital, 010825 Bucharest, Romania
| | - Cătălin Gabriel Apostolescu
- National Institute for Infectious Diseases “Prof. Dr. Matei Balș”, 021105 Bucharest, Romania; (V.A.); (M.L.L.); (G.J.); (C.G.A.); (A.S.C.)
- Department of Infectious Diseases 1, Carol Davila University of Medicine and Pharmacy, 020021 Bucharest, Romania
| | - Adrian Streinu Cercel
- National Institute for Infectious Diseases “Prof. Dr. Matei Balș”, 021105 Bucharest, Romania; (V.A.); (M.L.L.); (G.J.); (C.G.A.); (A.S.C.)
- Department of Infectious Diseases 1, Carol Davila University of Medicine and Pharmacy, 020021 Bucharest, Romania
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