My son is diagnosing with the EBV virus, Five week ago his CBC test results showed an increase in lymphocytes. Two weeks ago we conducted another CBC test, his lymphocyte levels are now decreasing. Additionally, one of his lymph node has reduced in size, though it still hasn't returned to its normal size after five weeks. While there is no pain in the lymph node, he experiences mild discomfort when it is pressed. Please suggest how much time it need to return to its normal size or should I need further tests for this.