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Estimating the burden of influenza-related and associated hospitalizations and deaths in France: an eight-season data study, 2010-2018
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  • Magali Lemaitre,
  • Fouad Fayssoil,
  • Fabrice Carrat,
  • Pascal Crepey,
  • Jacques Gaillat,
  • Gaetan Gavazzi,
  • O. Launay,
  • Anne Mosnier,
  • Marie-Cecile Levant,
  • Mathieu Uhart
Magali Lemaitre
IQVIA France
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Fouad Fayssoil
IQVIA France
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Fabrice Carrat
INSERM
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Pascal Crepey
Université de Rennes 1
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Jacques Gaillat
Centre Hospitalier Annecy Genevois
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Gaetan Gavazzi
CHU Grenoble Alpes
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O. Launay
Université Paris Descartes Faculté de Médecine
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Anne Mosnier
Open Rome & Réseau des GROG
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Marie-Cecile Levant
Sanofi Pasteur SA
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Mathieu Uhart
Sanofi Pasteur SA
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Abstract

Background: In France, each year, influenza viruses are responsible for seasonal epidemics leading to 2-6 million cases. Influenza can cause severe disease that may lead to hospitalization or death. As severe disease may be due to the virus itself or to disease complications, estimating the burden of severe influenza is complex. The present study aimed at estimating the epidemiological and economic burden of severe influenza in France during eight consecutive influenza seasons (2010-2018). Methods: Influenza-related hospitalization and mortality data and patient characteristics were taken from the French hospital information database, PMSI. An ecological approach using cyclic regression models integrating the incidence of influenza syndrome from the Sentinelles Network supplemented the PMSI data analysis in estimating excess hospitalization and mortality (CépiDc – 2010-2015) and medical costs. Results: Each season, the average number of influenza-related hospitalizations was 18,979 (range: 8,627-44,024), with an average length of stay of 8 days. The average number of respiratory hospitalizations indirectly related with influenza (i.e., influenza-associated) was 31,490 (95% CI: 24,542-39,012), with an average cost of \euro141 million (range: 54-217); 70% of these hospitalizations and 77% of their costs concerned individuals ≥ 65 years of age (65+). More than 90% of excess mortality was in 65+ subjects. Conclusions: The combination of two complementary approaches allowed estimation of both influenza-related and associated hospitalizations and deaths and their burden in France, showing the substantial impact of complications. The present study highlighted the major public health burden of influenza and its severe complications, especially in 65+ subjects.
14 Dec 2021Submitted to Influenza and other respiratory viruses
16 Dec 2021Assigned to Editor
16 Dec 2021Submission Checks Completed
23 Dec 2021Editorial Decision: Accept
10 Jan 2022Published in Influenza and Other Respiratory Viruses. 10.1111/irv.12962