Full title: SARS-CoV-2 incubation period across variants of concern, individual factors, and circumstances of infection in France: a case series analysis from the ComCor study
The Lancet Microbe
Galmiche S, Cortier T, Charmet T, Schaeffer L, Chény O, von Platen C, ... & Fontanet, A.
The incubation period of SARS-CoV-2 has been estimated for the known variants of concern. However, differences in study designs and settings make comparing variants difficult. We aimed to estimate the incubation period for each variant of concern compared with the historical strain within a unique and large study to identify individual factors and circumstances associated with its duration.
We analysed data from a nationwide study conducted in France that used consistent methods throughout the emergence of multiple variants of concern, allowing comparison between variants. Our study provides evidence of a reduced incubation period for the omicron (B.1.1.529) variant of concern compared with all previously predominant variants while adjusting for individual factors (eg, age and vaccine status). We found evidence for a reduced incubation period in younger people and in situations of high viral inoculum (ie, not wearing a mask during contact or when the index case was symptomatic).
More information at https://doi.org/10.1016/S2666-5247(23)00005-8