Background There are few studies evaluating the frequency of chronic hepatitis B virus (HBV) infection in systemic lupus erythematosus (SLE) patients (1). Objectives Aim this study is to determine HBV seroprevalence SLE and compare it with normal population patient control groups (rheumatoid arthritis spondyloarthritis). Methods serology tests [hepatitis surface antigen (HBsAg), antibody (HBsAb...