tetano
Editor, Senior Moderator
BMC Med
. 2025 Dec 29;23(1):697.
doi: 10.1186/s12916-025-04503-2. Hybrid, infection- and vaccination-induced protection against laboratory- confirmed SARS-CoV-2 infection in a European multi-centre prospective cohort of healthcare workers, 2021-2024
Madelyn Rojas-Castro[SUP] 1 [/SUP], Ranya Mulchandani[SUP] 2 [/SUP], Kim Brolin[SUP] 3 [/SUP], Zvjezdana Lovrić Makarić[SUP] 4 [/SUP], Anneli Uusküla[SUP] 5 [/SUP], Colm Bergin[SUP] 6 7 [/SUP], Catherine Fleming[SUP] 8 9 [/SUP], Paolo Bonfanti[SUP] 10 11 [/SUP], Rita Murri[SUP] 12 13 [/SUP], Viesturs Zvirbulis[SUP] 14 [/SUP], Dace Zavadska[SUP] 15 [/SUP], Konstanty Szuldrzynski[SUP] 16 [/SUP], Vânia Gaio[SUP] 17 [/SUP], Corneliu Petru Popescu[SUP] 18 19 [/SUP], Mihai Craiu[SUP] 19 20 [/SUP], Raluca-Maria Hrișcă[SUP] 21 [/SUP], Maria Cisneros[SUP] 22 23 24 [/SUP], Miriam Latorre-Millán[SUP] 25 [/SUP], Goranka Petrović[SUP] 4 [/SUP], Liss Lohur[SUP] 26 [/SUP], Jonathan McGrath[SUP] 6 [/SUP], Lauren Ferguson[SUP] 8 [/SUP], Anna Spolti[SUP] 10 11 [/SUP], Katleen De Gaetano Donati[SUP] 12 13 [/SUP], Ilze Abolina[SUP] 14 [/SUP], Dagne Gravele[SUP] 15 [/SUP], Ausenda Machado[SUP] 17 [/SUP], Simin Aysel Florescu[SUP] 18 19 [/SUP], Mihaela Lazar[SUP] 27 [/SUP], Pilar Subirats[SUP] 22 [/SUP], Laura Clusa[SUP] 25 [/SUP], Gordan Sarajlić[SUP] 4 [/SUP], Jacklyn Sui[SUP] 6 [/SUP], Claire Kenny[SUP] 9 [/SUP], Rosaria Santangelo[SUP] 12 [/SUP], Dainis Krievins[SUP] 14 [/SUP], Elza Anna Barzdina[SUP] 15 [/SUP], Camila Valadas Henriques[SUP] 28 [/SUP], Alma Gabriela Kosa[SUP] 18 [/SUP], Săftica-Mariana Pohrib[SUP] 21 [/SUP], Victor Daniel Miron[SUP] 19 20 [/SUP], Carmen Muñoz-Almagro[SUP] 22 23 24 [/SUP], Ana Maria Milagro[SUP] 25 [/SUP], Sabrina Bacci[SUP] 3 [/SUP], Camelia Savulescu[SUP] 29 [/SUP]; VEBIS HCW VE study group
Collaborators, Affiliations
Background: Healthcare workers (HCWs) face high occupational exposure to SARS-CoV-2 and are a priority group for vaccination. Both natural infection and vaccination-individually or combined as hybrid immunity-confer protection against SARS-CoV-2 infection. This study aimed to evaluate the protection conferred by hybrid, infection-induced, and booster vaccine-induced immunity against laboratory-confirmed SARS-CoV-2 infections in HCWs during the circulation of three pandemic and one post-pandemic Omicron sublineages.
Methods: We conducted a prospective cohort study of HCWs from 18 hospitals across nine European countries. Participants underwent RT-PCR testing at enrolment and during weekly or fortnightly follow-ups. The study period was divided based on dominant Omicron sublineage circulation: BA.1/2 (Dec 16, 2021-Jun 1, 2022), BA.4/5/BQ.1 (Jun 2-Dec 31, 2022), BA.2/XBB (Jan 1-May 2, 2023), and post-pandemic XBB.1.5/BA.2.86 (Sep 1, 2023-May 21, 2024). Participants were classified into four groups: hybrid (prior infection and recent booster vaccination 7-179 days), infection-induced (prior infection, no recent vaccination), vaccine-induced immunity (recent booster vaccination, no prior infection), and a reference group (no prior infection, no recent booster vaccination). Adjusted hazard ratios (aHRs) for infection were estimated using Cox regression, adjusting for hospital, age, sex, chronic condition, and patient-facing role.
Results: A total of 3 133 HCWs were included: 2572 (82%) female, 1734 (55%) aged 40-59, and 563 (29%) with ≥ 1 chronic condition. Hybrid immunity showed significant protection during BA.1/2 (aHR = 0.37, 95%CI 0.21-0.63), BA.4/5/BQ.1 (aHR = 0.36, 95%CI 0.22-0.58), and XBB.1.5/BA.2.86 (aHR = 0.53, 95%CI 0.37-0.74) periods. Infection-induced immunity was protective across all periods, most during BA.1/2 (aHR = 0.26, 95%CI 0.12-0.53), and least during BA.2/XBB (aHR = 0.66, 95%CI 0.36-1.22). Vaccine-induced immunity alone offered limited protection during BA.1/2 (aHR = 0.72, 95%CI 0.49-1.06) and BA.4/5/BQ.1 (aHR = 0.77, 95%CI 0.50-1.19), with wide confidence intervals suggesting low statistical significance.
Conclusions: Hybrid and infection-induced immunity groups were more protected against infection caused by earlier Omicron sub-lineages and more protected than vaccination alone, which had no significant protective effect. These findings highlight the need for adaptive public health strategies, including timely vaccine updates and understanding of prior SARS-CoV-2 infection to inform COVID-19 vaccination policies for HCWs in the post-pandemic era.
Keywords: COVID-19 vaccination; Healthcare workers; Hybrid immunity; Omicron variant; Prospective cohort study.
. 2025 Dec 29;23(1):697.
doi: 10.1186/s12916-025-04503-2. Hybrid, infection- and vaccination-induced protection against laboratory- confirmed SARS-CoV-2 infection in a European multi-centre prospective cohort of healthcare workers, 2021-2024
Madelyn Rojas-Castro[SUP] 1 [/SUP], Ranya Mulchandani[SUP] 2 [/SUP], Kim Brolin[SUP] 3 [/SUP], Zvjezdana Lovrić Makarić[SUP] 4 [/SUP], Anneli Uusküla[SUP] 5 [/SUP], Colm Bergin[SUP] 6 7 [/SUP], Catherine Fleming[SUP] 8 9 [/SUP], Paolo Bonfanti[SUP] 10 11 [/SUP], Rita Murri[SUP] 12 13 [/SUP], Viesturs Zvirbulis[SUP] 14 [/SUP], Dace Zavadska[SUP] 15 [/SUP], Konstanty Szuldrzynski[SUP] 16 [/SUP], Vânia Gaio[SUP] 17 [/SUP], Corneliu Petru Popescu[SUP] 18 19 [/SUP], Mihai Craiu[SUP] 19 20 [/SUP], Raluca-Maria Hrișcă[SUP] 21 [/SUP], Maria Cisneros[SUP] 22 23 24 [/SUP], Miriam Latorre-Millán[SUP] 25 [/SUP], Goranka Petrović[SUP] 4 [/SUP], Liss Lohur[SUP] 26 [/SUP], Jonathan McGrath[SUP] 6 [/SUP], Lauren Ferguson[SUP] 8 [/SUP], Anna Spolti[SUP] 10 11 [/SUP], Katleen De Gaetano Donati[SUP] 12 13 [/SUP], Ilze Abolina[SUP] 14 [/SUP], Dagne Gravele[SUP] 15 [/SUP], Ausenda Machado[SUP] 17 [/SUP], Simin Aysel Florescu[SUP] 18 19 [/SUP], Mihaela Lazar[SUP] 27 [/SUP], Pilar Subirats[SUP] 22 [/SUP], Laura Clusa[SUP] 25 [/SUP], Gordan Sarajlić[SUP] 4 [/SUP], Jacklyn Sui[SUP] 6 [/SUP], Claire Kenny[SUP] 9 [/SUP], Rosaria Santangelo[SUP] 12 [/SUP], Dainis Krievins[SUP] 14 [/SUP], Elza Anna Barzdina[SUP] 15 [/SUP], Camila Valadas Henriques[SUP] 28 [/SUP], Alma Gabriela Kosa[SUP] 18 [/SUP], Săftica-Mariana Pohrib[SUP] 21 [/SUP], Victor Daniel Miron[SUP] 19 20 [/SUP], Carmen Muñoz-Almagro[SUP] 22 23 24 [/SUP], Ana Maria Milagro[SUP] 25 [/SUP], Sabrina Bacci[SUP] 3 [/SUP], Camelia Savulescu[SUP] 29 [/SUP]; VEBIS HCW VE study group
Collaborators, Affiliations
- PMID: 41466249
- DOI: 10.1186/s12916-025-04503-2
Background: Healthcare workers (HCWs) face high occupational exposure to SARS-CoV-2 and are a priority group for vaccination. Both natural infection and vaccination-individually or combined as hybrid immunity-confer protection against SARS-CoV-2 infection. This study aimed to evaluate the protection conferred by hybrid, infection-induced, and booster vaccine-induced immunity against laboratory-confirmed SARS-CoV-2 infections in HCWs during the circulation of three pandemic and one post-pandemic Omicron sublineages.
Methods: We conducted a prospective cohort study of HCWs from 18 hospitals across nine European countries. Participants underwent RT-PCR testing at enrolment and during weekly or fortnightly follow-ups. The study period was divided based on dominant Omicron sublineage circulation: BA.1/2 (Dec 16, 2021-Jun 1, 2022), BA.4/5/BQ.1 (Jun 2-Dec 31, 2022), BA.2/XBB (Jan 1-May 2, 2023), and post-pandemic XBB.1.5/BA.2.86 (Sep 1, 2023-May 21, 2024). Participants were classified into four groups: hybrid (prior infection and recent booster vaccination 7-179 days), infection-induced (prior infection, no recent vaccination), vaccine-induced immunity (recent booster vaccination, no prior infection), and a reference group (no prior infection, no recent booster vaccination). Adjusted hazard ratios (aHRs) for infection were estimated using Cox regression, adjusting for hospital, age, sex, chronic condition, and patient-facing role.
Results: A total of 3 133 HCWs were included: 2572 (82%) female, 1734 (55%) aged 40-59, and 563 (29%) with ≥ 1 chronic condition. Hybrid immunity showed significant protection during BA.1/2 (aHR = 0.37, 95%CI 0.21-0.63), BA.4/5/BQ.1 (aHR = 0.36, 95%CI 0.22-0.58), and XBB.1.5/BA.2.86 (aHR = 0.53, 95%CI 0.37-0.74) periods. Infection-induced immunity was protective across all periods, most during BA.1/2 (aHR = 0.26, 95%CI 0.12-0.53), and least during BA.2/XBB (aHR = 0.66, 95%CI 0.36-1.22). Vaccine-induced immunity alone offered limited protection during BA.1/2 (aHR = 0.72, 95%CI 0.49-1.06) and BA.4/5/BQ.1 (aHR = 0.77, 95%CI 0.50-1.19), with wide confidence intervals suggesting low statistical significance.
Conclusions: Hybrid and infection-induced immunity groups were more protected against infection caused by earlier Omicron sub-lineages and more protected than vaccination alone, which had no significant protective effect. These findings highlight the need for adaptive public health strategies, including timely vaccine updates and understanding of prior SARS-CoV-2 infection to inform COVID-19 vaccination policies for HCWs in the post-pandemic era.
Keywords: COVID-19 vaccination; Healthcare workers; Hybrid immunity; Omicron variant; Prospective cohort study.