had constant muscular pain and" headaches. He adds additional information by giving a history of regular unprotected sexual relationship

with multiple partners. He is a non-smoker and drinks alcohol occasionally. Vital signs: heart rate — 98/min., respiratory rate — 16/min.,

temperature — 38°C and blood pressure — 120/80 mm Hg. On physical examination, he is icteric and hepatosplenomcgaly is evident with

abdominal tenderness particularly in the right upper quadrant. The serologic markers show the following pattern: IgM anti-HBc positive,

HBsAg positive. Which of the following is the most likely diagnosis?