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Immune globulin given after exposure to hepatitis A is effective if administered within

  • A.three months of exposure
  • B.one year of exposure
  • C.two weeks of exposure
  • D.twelve hours of exposure

Answer: C

Because the incubation period averages four weeks, passive antibody given inside the first two weeks can still prevent or attenuate illness. Vaccine is now often preferred for healthy contacts, with immune globulin reserved for the very young, the elderly and the immunocompromised.

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