LAUSR

kidney biopsy was M1E1S1T1C2. The patient underwent tonsillectomy and steroid pulse therapy. After 35 days of treatment, serum Cre levels improved to 2.74 mg/dl and proteinuria decreased to 0.2 g/gCre. Many studies have reported recurrence or worsening of various kidney diseases after SARS-CoV-2 infection. Considering the absence of prior urinary abnormalities, he seemingly developed new kidney damage within few months, indicating rapidly progressive glomerulonephritis. To our knowledge, this is the first case report describing the clinical course of new-onset IgA nephropathy due to SARS-CoV-2 infection. The mechanism of IgA nephropathy post SARS-CoV-2 infection remains to be elucidated; however, continuous IgA production after SARSCoV-2 infection may occur. There is a possibility of developing new nephritis as well as exacerbation of existing nephritis after SARS-CoV-2 infection, necessitating a careful follow-up.