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Trends in social exposure to SARS-Cov-2 in France. Evidence from the national socio-epidemiological cohort-EPICOV.
Warszawski, Josiane; Meyer, Laurence; Franck, Jeanna-Eve; Rahib, Delphine; Lydié, Nathalie; Gosselin, Anne; Counil, Emilie; Kreling, Robin; Novelli, Sophie; Slama, Remy; Raynaud, Philippe; Bagein, Guillaume; Costemalle, Vianney; Sillard, Patrick; Fourie, Toscane; de Lamballerie, Xavier; Bajos, Nathalie.
  • Warszawski J; INSERM CESP U1018, Université Paris-Saclay, Le Kremlin-Bicêtre, France.
  • Meyer L; AP-HP Epidemiology and Public Health Service, Service, Hôpitaux Universitaires Paris-Saclay, Le Kremlin-Bicêtre, France.
  • Franck JE; INSERM CESP U1018, Université Paris-Saclay, Le Kremlin-Bicêtre, France.
  • Rahib D; AP-HP Epidemiology and Public Health Service, Service, Hôpitaux Universitaires Paris-Saclay, Le Kremlin-Bicêtre, France.
  • Lydié N; Iris-Institut de Recherche Interdisciplinaire sur les enjeux sociaux, Inserm, Aubervilliers, France.
  • Gosselin A; Santé Publique France, Saint-Maurice, France.
  • Counil E; Santé Publique France, Saint-Maurice, France.
  • Kreling R; French Institute for Demographic Studies (INED), Aubervilliers, France.
  • Novelli S; French Collaborative Institute on Migrations/CNRS, Aubervilliers, France.
  • Slama R; French Institute for Demographic Studies (INED), Aubervilliers, France.
  • Raynaud P; INSERM CESP U1018, Université Paris-Saclay, Le Kremlin-Bicêtre, France.
  • Bagein G; INSERM CESP U1018, Université Paris-Saclay, Le Kremlin-Bicêtre, France.
  • Costemalle V; Institut thématique de Santé Publique, INSERM, Paris, France.
  • Sillard P; Inserm, CNRS, Team of Environmental Epidemiology applied to Reproduction and Respiratory Health, Institute for Advanced Biosciences, University Grenoble Alpes, Grenoble, France.
  • Fourie T; DREES-Direction de la Recherche, des Etudes, de l'évaluation et des statistiques, Paris, France.
  • de Lamballerie X; DREES-Direction de la Recherche, des Etudes, de l'évaluation et des statistiques, Paris, France.
  • Bajos N; DREES-Direction de la Recherche, des Etudes, de l'évaluation et des statistiques, Paris, France.
PLoS One ; 17(5): e0267725, 2022.
Article in English | MEDLINE | ID: covidwho-1869199
ABSTRACT

BACKGROUND:

We aimed to study whether social patterns of exposure to SARS-CoV-2 infection changed in France throughout the year 2020, in light to the easing of social contact restrictions.

METHODS:

A population-based cohort of individuals aged 15 years or over was randomly selected from the national tax register to collect socio-economic data, migration history, and living conditions in May and November 2020. Home self-sampling on dried blood was proposed to a 10% random subsample in May and to all in November. A positive anti-SARS-CoV-2 ELISA IgG result against the virus spike protein (ELISA-S) was the primary outcome. The design, including sampling and post-stratification weights, was taken into account in univariate and multivariate analyses.

RESULTS:

Of the 134,391 participants in May, 107,759 completed the second questionnaire in November, and respectively 12,114 and 63,524 were tested. The national ELISA-S seroprevalence was 4.5% [95%CI 4.0%-5.1%] in May and 6.2% [5.9%-6.6%] in November. It increased markedly in 18-24-year-old population from 4.8% to 10.0%, and among second-generation immigrants from outside Europe from 5.9% to 14.4%. This group remained strongly associated with seropositivity in November, after controlling for any contextual or individual variables, with an adjusted OR of 2.1 [1.7-2.7], compared to the majority population. In both periods, seroprevalence remained higher in healthcare professions than in other occupations.

CONCLUSION:

The risk of Covid-19 infection increased among young people and second-generation migrants between the first and second epidemic waves, in a context of less strict social restrictions, which seems to have reinforced territorialized socialization among peers.
Subject(s)

Full text: Available Collection: International databases Database: MEDLINE Main subject: SARS-CoV-2 / COVID-19 Type of study: Cohort study / Experimental Studies / Observational study / Prognostic study / Randomized controlled trials Limits: Adolescent / Adult / Humans / Young adult Country/Region as subject: Europa Language: English Journal: PLoS One Journal subject: Science / Medicine Year: 2022 Document Type: Article Affiliation country: JOURNAL.PONE.0267725

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Full text: Available Collection: International databases Database: MEDLINE Main subject: SARS-CoV-2 / COVID-19 Type of study: Cohort study / Experimental Studies / Observational study / Prognostic study / Randomized controlled trials Limits: Adolescent / Adult / Humans / Young adult Country/Region as subject: Europa Language: English Journal: PLoS One Journal subject: Science / Medicine Year: 2022 Document Type: Article Affiliation country: JOURNAL.PONE.0267725