ArticleInfluenza and other respiratory viruses2025
Influenza Epidemiology in Finland During and After the COVID-19 Pandemic: Surveillance Data Analysis (2019-2024).
Article in Influenza and other respiratory viruses, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed.
- Overview of adult immunization in Finland: Successes, lessons learned and the way forward.Human vaccines & immunotherapeutics · 2026Review
- Live Attenuated Influenza Vaccine (LAIV) for Children for the Prevention of Influenza Illness in Sweden: A Cost-Effectiveness Analysis.Infectious diseases and therapy · 2026Article
- Increasing Underrepresentation of Pacific Peoples in Community-Based Respiratory Surveillance in Aotearoa New Zealand, 2018-2024.Journal of the Royal Society of New Zealand · 2026Article
- Feasibility of conducting brand-specific influenza vaccine effectiveness studies in three Nordic countries, Denmark, Finland, Sweden.Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin · 2026Article
- Suppression and resurgence: the evolving epidemiology of seasonal influenza from 2015 to 2024 in a core urban district of Beijing, China.Frontiers in public health · 2026Article
- Influenza Epidemiology in Finland During and After the COVID-19 Pandemic: Surveillance Data Analysis (2019-2024).Influenza and other respiratory viruses · 2025Article
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Abstract
backgroundThe Finnish influenza surveillance system combines traditional virological surveillance and analyses of electronic health records. This paper describes the influenza epidemiology in Finland (population: 5.5 million) during and after the COVID-19 pandemic based on national surveillance data from 2019 to 2024.
methodsInfluenza incidence was evaluated based on three register-based outcomes: laboratory-confirmed infections, primary health care visits, and hospitalizations. Virus-type distributions were analyzed from respiratory specimens. In register-based analyses, vaccination coverage and vaccine effectiveness were assessed for the two cohorts universally included in the Finnish vaccination program: children aged ≤ 6 years and adults aged ≥ 65 years.
resultsThe 2019/2020 influenza epidemic ended with the introduction of COVID-19 containment measures. In 2020/2021, influenza was largely absent. The 2021/2022 epidemic peaked exceptionally late. Influenza activity returned to prepandemic levels in 2022/2023. None of the 717 sentinel specimens tested positive for B/Yamagata. Although the percentage of vaccinated young children was constant (31% [100,387/323,614] to 37% [126,984/346,344]), the percentage of vaccinated elderly people increased from 48% (577,404/1,211,732) in 2019/2020 to 63% (787,771/1,255,644) in 2021/2022. The vaccine effectiveness against hospitalization due to laboratory-confirmed influenza in young children and elderly people was 68% (95% confidence interval: 38%; 83%) and 42% (34%; 50%) in 2022/2023, respectively, and slightly lower in 2023/2024.
conclusionsThe COVID-19 pandemic had two potentially lasting effects on influenza: elimination of the B/Yamagata lineage and improved vaccination coverage in the elderly population in Finland. To strengthen the Finnish influenza surveillance system, participation in sentinel surveillance must be improved.
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