GPT and Epstein-Barr virus infection: When laboratory findings of pediatric patients with EBV infection were compared according to ultrasonographic GB disease, platelet count was significantly lower in the thickened GB wall group than in the normal GB wall group (P = 0.004), whereas the levels of serum direct bilirubin, alanine aminotransferase, and γGT were significantly higher (P = 0.000, P = 0.041, and P = 0.001, respectively) in the thickened GB wall group (Table 3).