One year ago an 8-year-old boy had a case of hepatitis B. For the last two months he has been complaining of fatigability, disturbed sleep, loss of appetite, and nausea, especially in the morning. His skin is not icteric, the liver and spleen are painless and can be palpated 1 cm below the costal margin. His ALT levels are 220 units. How this condition can be interpreted?