<prompt> A nursing student has just completed her hepatitis B vaccine series. On reviewing her laboratory studies assuming she has no prior exposure to hepatitis B, you Expect:Positive test for hepatitis B surface antigenAntibody against hepatitis B surface antigen anti-HBS aloneAntibody against hepatitis core antigen anti-HBCAntibody against both surface and core antigen  <response>: Ans. B. Antibody against hepatitis B surface antigen anti-HBS alonea. The current hepatitis B vaccine is genetically engineered to consist of hepatitis B surface antigen particles.b. Therefore, only antibody to surface antigen will be detected after vaccination.c. Since the patient has had no exposure to hepatitis B, she should be surface antigen-negative; surface antigen positivity means active disease, either acute or chronic.d. Patients who have recovered from hepatitis B have HBS ab and HBC ab. 