<prompt> A 30 years man presented with nausea, fever and jaundice of 5 days duration. The biochemical tests revealed a bilirubin of 6.7 mgdl conjugated 5.0 mgd1 with SGOTSGPT ASTALT of 1230900 IUml. The serological tests showed presence of HBs Ag 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. b Acute hepatitis B infection with high infectivity See the following table, Do not try to learn it, just try to understand Commonly Encountered Serologic Patterns of Hepatitis B Infection HBsAg Anti-HBc Anti-Hac HBeAg Anti-HBe Interpretation - lgM - Acute hepatitis B, high infectivity - lgG - Chronic active Hepatitis B, high infectivity - lgG - 1. Late acute or chronic hepatitis B, low infectivity 2. HBeAg-negative precore mutant hepatitis B - - 1. HBsAg of one subtype and heterotypic anti-HBs common 2. Process of seroconversion from HBsAg to anti-HBs rare - - lgM - - Acute hepatitis B Anti-HBc window - - lgG - - Low-lenel hepatitis B carrier or hepatitis B in remote post - lgG - - Recovery from hepatitis B - - - - 1. lmmunization with HBsAg after vaccination2. Hepatitis B in the remote past3. False-positive 