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Large and middle hepatitis B surface antigen: the lower the better?
  1. Hsuan-Ho Lin1,
  2. Tai-Chung Tseng1,2,
  3. Jia-Horng Kao2,3,4
  1. 1Division of Gastroenterology, Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
  2. 2Hepatitis Research Center, National Taiwan University Hospital, Taipei, Taiwan
  3. 3Department of Medical Research, National Taiwan University Hospital, Taipei, Taiwan
  4. 4Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan
  1. Correspondence to Professor Jia-Horng Kao, Hepatitis Research Center, National Taiwan University Hospital, Taipei 10002, Taiwan; kaojh{at}ntu.edu.tw

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We read with great interest the article entitled ‘Quantification of large and middle proteins of hepatitis B virus surface antigen (HBsAg) as a novel tool for the identification of inactive HBV carriers’ by Pfefferkorn et al.1 Serum hepatitis B surface antigen (HBsAg) level has been shown to complement HBV DNA level in predicting clinical outcomes of patients with chronic HBV infection.2 3 In Asian patients, mostly genotype B and C infection, with a low viral load (HBV DNA  ≤2000 IU/mL), HBsAg level >1000 IU/mL indicates …

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