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Immunoglobulin A nephropathy was diagnosed 18 months earlier. Gross hematuria appeared two days after the second messenger RNA coronavirus disease 2019 (COVID-19) vaccine dose with a peak increase in random urine protein-to-creatinine ratio (PCR). Although urine PCR improved quickly, a complete recovery to the previous state was not seen. Serum creatinine levels were stable before and after vaccination.
