Microbiology Virology 2fa4f451 In a patient only HBs Ag is positive ins serum, all other markers are negative, This indicates - A Acute hepatitis B Chronic active hepatitis C Persistent carrier D Hepatitis B vaccination High-Yield Explanation Presence of only HBsAg indicate immunisation. REF:MICROBIOLOGY ANANTHA NARAYANAN NINTH EDITION PAGE.546&548