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Updated: Nov 19, 2025

Author Spotlight: Advancements in Multiplex Detection of Respiratory Viruses
Published on: November 10, 2023
Do not neglect SARS-CoV-2 hospitalization and fatality risks in the middle-aged adult population
Nathanael Lapidus1, Juliette Paireau2, Daniel Levy-Bruhl3
1Sorbonne Université, Inserm, Institut Pierre-Louis d'Epidémiologie et de Santé Publique, Département de Santé Publique, Hôpital Saint-Antoine, APHP, Paris, France.
Objectives:
This study aimed at estimating the SARS-CoV-2 infection hospitalization (IHR) and infection fatality ratios (IFR) in France.
Patients And Methods:
A serosurvey was conducted in 9782 subjects from the two French regions with the highest incidence of COVID-19 during the first wave of the pandemic and coupled with surveillance data.
Results:
IHR and IFR were 2.7% and 0.49% overall. Both were higher in men and increased exponentially with age. The relative risks of hospitalization and death were 2.1 (95% CI: 1.9-2.3) and 3.8 (2.4-4.2) per 10-year increase, meaning that IHR and IFR approximately doubled every 10 and 5 years, respectively. They were dramatically high in the very elderly (80-90 years: IHR: 26%, IFR: 9.2%), and also substantial in younger adults (40-50 years: IHR: 0.98%, IFR: 0.042%).
Conclusions:
These findings support the need for comprehensive preventive measures to help reduce the spread of the virus, even in young or middle-aged adults.
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