De Novo Immunoglobulin A Vasculitis Following Exposure to SARS-CoV-2 Immunization.

Background: Immunizations have been previously described as potential triggering events for the development of certain glomerular diseases. However, glomerular disease occurrences are being reported after exposure to a severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) vaccine. Case Report: A 50-year-old male presented to a nephrology clinic for evaluation of persistent proteinuria. Six weeks prior to evaluation, the patient had reported developing a rash 2 weeks after receiving the first dose of a SARS-CoV-2 vaccine (BNT162b2 mRNA, Pfizer, Inc). His primary care provider treated the rash with corticosteroids, leading to partial improvement of the skin lesions. Three weeks after the first vaccine injection, the patient received his scheduled second vaccine injection. Within 2 days, the rash reappeared. This time, the lesions were more severe in nature. Skin biopsy revealed immunoglobulin A (IgA)-dominant leukocytoclastic vasculitis. After the patient completed 2 weeks of oral corticosteroids, urinalysis revealed proteinuria, and consultation with nephrology was requested. On examination, healing papules were noted on his legs. Serum creatinine 2 weeks after the second dose of vaccine was 0.9 mg/dL. Microscopic examination of the urinary sediment revealed acanthocytes. Urine protein to creatinine ratio 3 weeks after the second dose of vaccine was 1.1 g/day. Serum complements were normal, and all pertinent serology was negative. Kidney biopsy findings were consistent with IgA nephropathy. Conclusion: The clinical presentation and pathologic findings in this case strongly suggest that the Pfizer SARS-CoV-2 vaccine can trigger a clinical syndrome compatible with Henoch-Schönlein purpura. The recurrence of the rash following the second dose argues for a definite causal association by the Naranjo criteria.