Age 18-65 years old Diagnosis of SLE according to American College of Rheumatology (ACR) 1997 or The Systemic Lupus International Collaborating Clinics (SLICC) criteria or or EULAR/ACR classification Diagnosis of RA according to 2010 ACR and European League Against Rheumatism (EULAR) classification criteria for rheumatoid arthritis, who have been vaccinated with either inactivated SARS-CoV-2 or viral-vector ChAdOx1 nCoV-19 COVID-19 vaccine

Age 18-65 years old Diagnosis of SLE according to American College of Rheumatology (ACR) 1997 or The Systemic Lupus International Collaborating Clinics (SLICC) criteria or or EULAR/ACR classification Diagnosis of RA according to 2010 ACR and European League Against Rheumatism (EULAR) classification criteria for rheumatoid arthritis, who have been vaccinated with either inactivated SARS-CoV-2 or viral-vector ChAdOx1 nCoV-19 COVID-19 vaccine