The purpose of this study is : * To evaluate prevalence of protective hepatitis B antibody comparing intradermal (ID) and intramuscular (IM) route in antiHbsAb negative HIV infected children treated with highly active antiretroviral therapy (HAART) * To revaccinate the HBV vaccine in the children who didn't have protective HBV Ab
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Inclusion Criteria: * HIV infected individuals * Age 1-18 years * Current CD4 within 6 months ≥ 15% or ≥ 200 cells/ml in children age ≥ 6 years * Signed written informed consent * Negative HBs Ag, antiHBs, and antiHBc at screening visit Exclusion Criteria: * Active AIDS * Active opportunistic infection * Platelet \< 50,000/ mm3 at screening visit * History of hypersensitivity to HBV vaccine * Using oral steroid or immunosuppressive drugs