The COVID-19 pandemic has significantly impacted the health of individuals with autoimmune rheumatic diseases (AIRDs), who being immunologically vulnerable, are at an increased risk of complications following a COVID-19 infection. 1,2 This can be attributed to the derangement of the interferon axis in both autoimmune diseases and COVID-19 infection. Particularly, type I interferons have been indicated in the pathogenesis of autoimmune diseases 3 and in the generation of an immune response to a COVID-19 infection. 4,5 The similar pathogenesis puts patients with AIRDs at an increased risk for disease exacerbations. Although there is a wealth of data concerning new onset phenomena following a COVID-19 infection, there remains a scarcity of information regarding the characteristics and risk factors associated with disease flares in patients with AIRDs subsequent to a COVID-19 infection. 6 The COVID-19 vaccination in autoimmune diseases (COVAD) study is an international collaborative study involving 167 collaborators in 110 countries designed to explore the different facets of COVID-19 infection, vaccination, and disease activity in individuals with AIRDs. 7-9 The COVAD database is an ideal cohort for this study due to its extensive geographical coverage including under-represented regions, and its use of validated tools. Using a standardized and validated self-reported questionnaire, the COVAD study collected data regarding demographics, vaccine types, medications, and comorbid conditions in patients with AIRDs and healthy controls. Binary logistic regression (BLR) analyses were performed with adjustment for age, gender, ethnicity, vaccine type, immunosuppressive medications, comorbidities, COVID-19 antibody status, and clinical features during previous COVID-19 infection, stratified by country of residence (detailed methods in Supplementary File S1). Medians and interquartile ranges (IQRs) were used to summarize continuous data and Chisquared (χ 2 ) and Mann-Whitney U tests were used to compare AIRD patients with flares to those without flares for categorical and continuous variables, respectively. Finally, physical and mental health, fatigue, and pain were assessed using the PROMIS PF10 scores.