Tiffany Charmet

• French Institute of Health and Medical Research

Background The capacity of the 7C model’s psychological antecedents, which include confidence in vaccines, complacency, convenience, calculation, collective responsibility, confidence in the wider system, and social conformism, to explain variance in COVID-19 vaccine intentions and behaviours has been documented. However, it remains unclear whether...

Background Establishing correlates of protection often requires large cohorts. A rapid and adaptable case–control study design can be used to identify antibody correlates of protection against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection in serum and saliva. Methods We designed a case–control study to compare antibody lev...

Purpose The aim of the study was to identify settings associated with SARS-CoV-2 transmission throughout the COVID-19 pandemic in France. Methods Cases with recent SARS-CoV-2 infection were matched with controls (4:1 ratio) on age, sex, region, population size, and calendar week. Odds ratios for SARS-CoV-2 infection were estimated for nine periods...

Background Widely documented psychological antecedents of vaccination are confidence in vaccines, complacency, convenience, calculation, collective responsibility (5C model) with the recent addition of confidence in the wider system and social conformism. While the capacity of these seven antecedents (7C) to explain variance in COVID-19 vaccine int...

Background We aimed to study the source of infection for recently SARS-CoV-2-infected individuals from October 2020 to August 2022 in France. Methods Participants from the nationwide ComCor case–control study who reported recent SARS-CoV-2 infection were asked to document the source and circumstances of their infection through an online questionna...

Background We aimed to study the source of infection for recently SARS-CoV-2-infected individuals from October 2020 to August 2022 in France. Methods Participants from the nationwide ComCor case-control study who reported recent SARS-CoV-2 infection were asked to document the source and circumstances of their infection through an online questionna...

Importance Understanding the contribution of children to SARS-CoV-2 circulation in households is critical for designing public health policies and mitigation strategies. Objective To identify temporal changes in the risk of SARS-CoV-2 infection in people living with children. Design, Setting, and Participants This case-control study included onli...

Purpose Our objective was to describe circumstances of SARS-CoV-2 household transmission and to identify factors associated with a lower risk of transmission in a nationwide case–control study in France. Methods In a descriptive analysis, we analysed cases reporting transmission from someone in the household (source case). Index cases could invite...

Background Following the SARS-CoV-2 Omicron variant spread, the use of unsupervised antigenic rapid diagnostic tests (self-tests) increased.AimThis study aimed to measure self-test uptake and factors associated with self-testing.Methods In this cross-sectional study from 20 January to 2 May 2022, the case series from a case-control study on factors...

Background: 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...

Objectives: This study assessed the roles of various exposures and personal protective equipment (PPE) use on healthcare workers'risk (HCWs) of COVID-19 working in primary care, long-term-care facilities or hospitals. Methods: We conducted a matched case-control (1:1) study (10 April-9 July 2021). Cases (HCWs with confirmed COVID-19) and control...

Objectives Healthcare workers (HCWs) are at higher risk of contracting coronavirus disease-19 (COVID-19) than the general population. This study assessed the roles of various exposures and personal protective equipment (PPE) use on that risk for HCWs working in primary care, long-term-care facilities (LTCFs) or hospitals. Methods We conducted a ma...

Background We aimed to assess the settings and activities associated with SARS-CoV-2 infection in the context of B.1.617.2 (Delta) variant circulation in France, as well as the protection against symptomatic Delta infection. Methods In this nationwide case-control study, cases were SARS-CoV-2 infected adults recruited between 23 May and 13 August...

Background: We aimed to assess the effectiveness of two doses of mRNA COVID-19 vaccines against COVID-19 with the original virus and other lineages circulating in France. Methods: In this nationwide case-control study, cases were SARS-CoV-2 infected adults with onset of symptoms between 14 February and 3 May 2021. Controls were non-infected adul...

Background We aimed to assess the role of different setting and activities in acquiring SARS-CoV-2 infection. Methods In this nationwide case-control study, cases were SARS-CoV-2 infected adults recruited between 27 October and 30 November 2020. Controls were individuals from the Ipsos market research database matched to cases by age, sex, region,...

In France, apparently healthy dogs and cats that bite humans must undergo an observation period of 15 days with three veterinary visits to ascertain that they remain healthy, indicating that no zoonotic transmission of rabies virus occurred via salivary presymptomatic excretion. This surveillance protocol is mandatory for all pets that have bitten...