Vaccine effectiveness against COVID-19 hospitalisation in adults (≥ 20 years) during Omicron-dominant circulation: I-MOVE-COVID-19 and VEBIS SARI VE networks, Europe, 2021 to 2022

Angela Rose, Nathalie Nicolay, Virginia Sandonis Martín, Clara Mazagatos, Goranka Petrović, Joaquin Baruch, Sarah Denayer, Lucie Seyler, Lisa Domegan, Odile Launay, Ausenda Machado, Cristina Burgui, Roberta Vaikutyte, Annabel F. Niessen, Isabela I Loghin, Petr Husa, Nassera Aouali, George Panagiotakopoulos, Kristin Tolksdorf, Judit Krisztina HorváthJennifer Howard, Francisco Pozo, Virtudes Gallardo, Diana Nonković, Aušra Džiugytė, Nathalie Bossuyt, Thomas Demuyser, Róisín Duffy, Liem binh Luong Nguyen, Irina Kislaya, Iván Martínez-Baz, Giedre Gefenaite, Mirjam J Knol, Corneliu Popescu, Lenka Součková, Marc Simon, Stella Michelaki, Janine Reiche, Annamária Ferenczi, Concepción Delgado-Sanz, Zvjezdana Lovrić Makarić, John Paul Cauchi, Cyril Barbezange, Els Van Nedervelde, Joan O’Donnell, Christine Durier, Raquel Guiomar, Jesús Castilla, Indrė Jonikaite, Patricia CJL Bruijning-Verhagen, Mihaela Lazar, Regina Demlová, Gil Wirtz, Marina Amerali, Ralf Dürrwald, Mihály Pál Kunstár, Esther Kissling Kissling, Sabrina Bacci, Marta Valenciano

Research output: Contribution to journalArticlepeer-review


The I-MOVE-COVID-19 and VEBIS hospital networks have been measuring COVID-19 vaccine effectiveness (VE) in participating European countries since early 2021.

We aimed to measure VE against PCR-confirmed SARS-CoV-2 in patients ≥ 20 years hospitalised with severe acute respiratory infection (SARI) from December 2021 to July 2022 (Omicron-dominant period).

In both networks, 46 hospitals (13 countries) follow a similar test-negative case–control protocol. We defined complete primary series vaccination (PSV) and first booster dose vaccination as last dose of either vaccine received ≥ 14 days before symptom onset (stratifying first booster into received < 150 and ≥ 150 days after last PSV dose). We measured VE overall, by vaccine category/product, age group and time since first mRNA booster dose, adjusting by site as a fixed effect, and by swab date, age, sex, and presence/absence of at least one commonly collected chronic condition.

We included 2,779 cases and 2,362 controls. The VE of all vaccine products combined against hospitalisation for laboratory-confirmed SARS-CoV-2 was 43% (95% CI: 29–54) for complete PSV (with last dose received ≥ 150 days before onset), while it was 59% (95% CI: 51–66) after addition of one booster dose. The VE was 85% (95% CI: 78–89), 70% (95% CI: 61–77) and 36% (95% CI: 17–51) for those with onset 14–59 days, 60–119 days and 120–179 days after booster vaccination, respectively.

Our results suggest that, during the Omicron period, observed VE against SARI hospitalisation improved with first mRNA booster dose, particularly for those having symptom onset < 120 days after first booster dose
Original languageEnglish
Article number2300187
Number of pages17
Issue number47
Publication statusPublished - Nov 2023

Bibliographical note

Funding Information:
Study teams are very grateful to all patients, physicians, laboratory teams, and national or regional epidemiologists who have contributed to the study. The Spanish team thanks all the participants in the SiVIRA Group for Surveillance and vaccine effectiveness in Spain), including everyone involved in data collection and notification at the sentinel hospitals, laboratories, and public health units of all participating Autonomous Regions. The Romanian study team in addition thanks Elena Duca, George Silvas, Adriana Bahna, Oana Secrieru (Spitalul Clinic de Boli Infectioase “Sfanta Parascheva”) and Alma Gabriela Kosa, Daniel Codreanu, Gratiela Tardei (Spitalul Clinic de Boli Infectioase si Tropicale dr Victor Babes) for their hard work. The Hungarian study team works as part of the National Laboratory for Health Security Hungary (RRF-2.3.1-21-2022-00006) supported by the National Research, Development and Innovation Office (NKFIH). Participating laboratories submitted their sequences to GISAID ( for easy sharing with the central laboratory in Madrid.

Publisher Copyright:
© 2023 European Centre for Disease Prevention and Control (ECDC). All rights reserved.


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