Effectiveness of influenza vaccination in preventing confirmed influenza cases and hospitalizations in Northern Spain, 2023/24 season: A population-based test-negative case-control study.

IF 4.8 2区医学 Q1 INFECTIOUS DISEASES

International Journal of Infectious Diseases Pub Date : 2024-12-16 DOI:10.1016/j.ijid.2024.107364

Iván Martínez-Baz, Ana Navascués, Camino Trobajo-Sanmartín, Francisco Pozo, Miguel Fernández-Huerta, Maddi Olazabal-Arruiz, Lucía Argente-Colas, Guillermo Ezpeleta, Aitziber Echeverria, Itziar Casado, Carmen Ezpeleta, Jesús Castilla

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引用次数: 0

Abstract

Objective: We estimated the influenza vaccination effectiveness (IVE) in preventing medical consultations and hospitalizations due to influenza during the 2023/24 season.

Methods: Two test-negative case-control studies analyzed patients who consulted primary healthcare or were hospitalized for respiratory symptoms and were tested for influenza by PCR in the 2023/24 season in Navarre, Spain. Influenza vaccination status in the current and previous seasons was compared between confirmed influenza cases and test-negative controls. IVE was calculated as (1-adjusted odds ratio)x100.

Results: Of 3133 hospitalized patients, 529 (17%) were positive for influenza: 71% A/H1N1, 23% A/H3N2, and 7% A non-subtyped. IVE to prevent hospitalizations was 43% (95%CI: 26-56%) overall, 61% (95%CI: 32-77%) in people younger than 65 years old and 35% (95%CI: 10-53%) in older people. IVE was 48% (95%CI: 30-61%) against influenza A/H1N1, and 15% (95%CI: -42-49%) against influenza A/H3N2. IVE in people vaccinated only in the previous season was 28% (95%CI: -5-51%). Among 417 outpatients, 146 (35%) were confirmed for influenza. IVE to prevent outpatient cases was 49% (95%CI: -9-76%) overall and 42% (95%CI: -33-74%) against influenza A/H1N1.

Conclusions: IVE was moderate against influenza A/H1N1 and low against influenza A/H3N2 in the 2023/24 season.

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来源期刊

International Journal of Infectious Diseases 医学-传染病学

CiteScore

18.90

自引率

2.40%

发文量

1020

审稿时长

30 days

期刊介绍： International Journal of Infectious Diseases (IJID) Publisher: International Society for Infectious Diseases Publication Frequency: Monthly Type: Peer-reviewed, Open Access Scope: Publishes original clinical and laboratory-based research. Reports clinical trials, reviews, and some case reports. Focuses on epidemiology, clinical diagnosis, treatment, and control of infectious diseases. Emphasizes diseases common in under-resourced countries.