COVID-19: before improvement, national results from matching between SI-VIC, SI-DEP and VAC-SI

**Nota bene: these data were revised following an improvement in the estimate of vaccination coverage on 28 October 2022. The new data and the methodological note are available via the links below:
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[Revised data](https://data.drees.solidarites-sante.gouv.fr/explore/dataset/covid-19-resultats-regionaux-issus-des-appariements-entre-si-vic-si-dep-et-vac-s/information/)

As part of its mission to support the management of the health crisis, the Directorate of Research, Studies, Evaluation and Statistics (DREES) uses pseudonymised data from the three main databases on the Covid-19 crisis: Si-VIC (hospitalisation), SI-DEP (screening) and VAC-SI (vaccination).

These farms lead to numerous analyses, published or for use by crisis management actors, on the three themes: screening, hospitalisation and vaccination. DREES also makes crossovers between these bases, in order to shed light on issues that fall under several of these themes in a joint way. Thus, a regular follow-up according to the vaccination status of the number of positive cases in the Covid-19 tests and hospital admissions is carried out. Similarly, comparative analyses of the frequencies of severe Covid-19 cases depending on the variant or identified mutations of the virus affecting patients may be conducted. These data cover all ages and France as a whole