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SARS-CoV-2 transmission across age groups in France and implications for control

Abstract : The shielding of older individuals has been proposed to limit COVID-19 hospitalizations while relaxing general social distancing in the absence of vaccines. Evaluating such approaches requires a deep understanding of transmission dynamics across ages. Here, we use detailed agespecific case and hospitalization data to model the rebound in the French epidemic in summer 2020, characterize age-specific transmission dynamics and critically evaluate different agetargeted intervention measures in the absence of vaccines. We find that while the rebound started in young adults, it reached individuals aged ≥80 y.o. after 4 weeks, despite substantial contact reductions, indicating substantial transmission flows across ages. We derive from these patterns the contribution of each age group to transmission. While shielding older individuals reduces mortality, it is insufficient to allow major relaxations of social distancing. When the epidemic remains manageable (R close to 1), targeting those that contribute more to transmission is better than shielding at-risk individuals. Pandemic control requires an effort from all age groups.
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Preprints, Working Papers, ...
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Contributor : Anne Lassailly-Bondaz Connect in order to contact the contributor
Submitted on : Friday, October 15, 2021 - 2:24:25 PM
Last modification on : Tuesday, September 27, 2022 - 10:32:49 AM


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Distributed under a Creative Commons Attribution - NonCommercial - NoDerivatives 4.0 International License


  • HAL Id : pasteur-03170966, version 2


Cécile Tran Kiem, Paolo Bosetti, Juliette Paireau, Pascal Crepey, Henrik Salje, et al.. SARS-CoV-2 transmission across age groups in France and implications for control. 2021. ⟨pasteur-03170966v2⟩



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