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. 2022 Jan;27(1):2101110.
doi: 10.2807/1560-7917.ES.2022.27.1.2101110.

Vaccine effectiveness against severe acute respiratory infections (SARI) COVID-19 hospitalisations estimated from real-world surveillance data, Slovenia, October 2021

Marta Grgič Vitek  1 , Irena Klavs  1 , Veronika Učakar  1 , Mojca Serdt  1 , Maja Mrzel  1 , Marjana Vrh  1 , Mario Fafangel  1
Affiliations

Vaccine effectiveness against severe acute respiratory infections (SARI) COVID-19 hospitalisations estimated from real-world surveillance data, Slovenia, October 2021

Marta Grgič Vitek et al. Euro Surveill. 2022 Jan.

Abstract

We estimated vaccine effectiveness (VE) against severe COVID-19 during October 2021, using Slovenian surveillance data. For people fully vaccinated with any vaccine in age groups 18-49, 50-64, ≥ 65 years, VE was 86% (95% CI: 79-90), 89% (85-91), and 77% (74-81). Among ≥ 65 year-olds fully vaccinated with mRNA vaccines, VE decreased from 93% (95% CI: 88-96) in those vaccinated ≤ 3 months ago to 43% (95% CI: 30-54) in those vaccinated ≥ 6 months ago, suggesting the need for early boosters.

Keywords: COVID-19; Slovenia; mRNA vaccines; severe acute respiratory infection (SARI); surveillance; vaccine effectiveness; viral vector vaccines.

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Conflict of interest statement

Conflict of interest: None declared.

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