A 30 years man presented with nausea, fever and jaundice of 5 days duration. The biochemical tests revealed a bilirubin of 6.7 mg/dl (conjugated 5.0 mg/d1) with SGOT/SGPT (AST/ALT) of 1230/900 IU/ml. The serological tests showed presence of HBs Ag IgM anti-HBc and HBeAg. The most likely diagnosis: