Factors associated with severe forms of COVID-19 infection in patients with inflammatory rheumatic diseases (IRD) or Autoimmune Diseases (AID) are unknown. This unprecedented situation leads to empirical and potentially erroneous advice and recommendations for care. Identifying factors associated with severity, in the context of this pandemic, which is expected to last many months, and possibly years, is crucial for future patients. The objective of this work is to identify the factors associated with the occurrence of severe forms of COVID-19 infection in patients with IRD or AID, by combining analysis of 2 large databases.

Inclusion Criteria:

• Patients with known chronic inflammatory rheumatism, auto-immune or auto-inflammatory diseases (Rheumatoid arthritis, Spondyloarthritis, Psoriatic arthritis Lupus, Sjögren's syndrome, Inflammatory Myositis, Systemic Vasculitis, Sarcoidosis, Scleroderma, PPR/Horton's, other ...)
• At least 18 years old
• SARS-Cov-2 infection (COVID-19) by biological data (serological or positive Cov-2 PCR) or CT scan images or clinical observations consistent with covid-19 between January 2020 and September 2020
• data available in the APHP health data center (EDS) or in the french RMD Covid19 cohort

Exclusion Criteria:

• patients opposed to the use of their data

Patients with known chronic inflammatory rheumatism, auto-immune or auto-inflammatory diseases (Rheumatoid arthritis, Spondyloarthritis, Psoriatic arthritis Lupus, Sjögren's syndrome, Inflammatory Myositis, Systemic Vasculitis, Sarcoidosis, Scleroderma, PPR/Horton's, other ...) with confirmed SARS-Cov-2 infection (COVID-19) whose data are available in the APHP health data center (EDS) or in the french RMD Covid19 cohort