CD79A and infection: In this case study, we present a patient with a history of <i>Staphylococcus epidermidis</i> infection, a past medical history of diabetes mellitus, and histopathological findings of APIGN with Immunoglobulin A (IgA) deposition.<h4>Methods</h4>A 58-year-old male presented to the emergency room with a 6-day history of severe low back pain.