COVID-19 is an infectious disease caused by SARS-CoV2 virus. The objective of our study is to analyze the progression and the severity of COVID-19 in patients with RA. Indeed, few data are available on this subject, and this would allow us to improve management of COVID-19 in these potential at-risk patients.

Inclusion criteria:

- Confirmed COVID-19 diagnosis (positive PCR or serology) in RA patients or healthy controls.

Exclusion criteria:

• Age under 18 years old
• Suspected COVID-19 diagnosis (typical symptoms without a positive PCR or serology)

Study population description: *

• Patients with RA, included in the French RMD Covid-19 cohort, with a confirmed COVID-19 diagnosis (positive PCR or serology).
• Patients included in the Montpellier COVID-19 cohort, without autoimmune disease or inflammatory rheumatism, and with a confirmed COVID-19 diagnosis (positive PCR or serology).

NC