Simultaneous occurrence of autoimmune hepatitis and autoimmune hemolytic anemia after COVID-19 infection: case report and literature review.

Various autoimmune diseases have been reported to develop as a result of a coronavirus disease 19 (COVID-19) infection. There have been some reports of COVID-19-triggered autoimmune hepatitis and autoimmune hemolytic anemia infection, but none have reported simultaneous onset of these diseases. A 15-year-old girl was admitted to our hospital with severe liver injury and anemia. Three weeks before admission, her father was diagnosed with COVID-19, after which she became aware of a sore throat. Two weeks later, she visited her doctor for malaise. She was referred to our hospital due to severe anemia, elevated hepatobiliary enzymes, and jaundice. A COVID-19 polymerase chain reaction test was positive at the time of referral. She was diagnosed with autoimmune hemolytic anemia based on decreased hemoglobin and haptoglobin, positive direct Coombs test, and increased urinary urobilinogen. Blood tests were positive for antinuclear antibodies, and a liver biopsy revealed interface hepatitis and plasma cell infiltration, consistent with autoimmune hepatitis. Based on these findings, a diagnosis of autoimmune hepatitis and autoimmune hemolytic anemia triggered by COVID-19 infection was made. Steroid therapy was initiated, which resulted in rapid improvement of blood markers and symptoms.