<prompt> A thirty-year-man presented with nausea, fever and jaundice of 5 days duration. The biochemical tests revealed a bilirubin of 6.7 mgdl conjugated 5.0 mgdl with SGOT SGPT ASTALT 1230900 IU ml The serological tests showed presence of HBsAg , IgM anti HBc and HBeAg . The most likely diagnosis:Chronic hepatitis B infection with high infectivityAcute hepatitis B infection with high infectivityChronic hepatitis B infection with low infectivityAcute hepatitis B infection with low infectivity  <response>: Ans. is b i.e., Acute hepatitis B infection with high infectivity Ref: Ananthanarayan, 9the, p. 548 and 8the, p. 544 Presence of HBsAg, IgM anti HBc and HBeAg suggest the diagnosis of acute hepatitis B with high infectivity. HBsAgAnti HBsAgHBeAg Anti HBeAg Anti HBcAgAcuteHBV high infectivity- IgMAcute HBV low infectivity- IgMChronic HBV high infectivity- IgGChronic HBV low infectivity- IgGRecovery--IgGImmunized- - 