Serum ALT levels were higher than the reference values (30–65 IU/ml for adults and not more than 48 IU/ml for children) at 65.73 ± 29.78 U/ml in DF patients and 138 ± 15.3 U/ml in DHF patients (P < 0.05). This evidence concerns the gene GPT and Dengue hemorrhagic fever.