Why is HBsAg positive?

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  1. #possible
  2. #antibody
  3. #positive
  4. #longer
  5. #reasons
  6. #check
  7. #contagious
  8. #immune
  9. #vaccinated
  10. #surface
  11. #infection
  12. #means
  13. #there
  14. #acute
  15. #immunity
  16. #recovered
  17. #hepatitis