Occult hepatitis B infections among blood donors in Lao PDR.

January 01, 2014 By:
  • Jutavijittum P
  • Andernach IE
  • Yousukh A
  • Samountry B
  • Samountry K
  • Thammavong T
  • Keokhamphue J
  • Toriyama K
  • Muller CP.

BACKGROUND AND OBJECTIVES: In Lao People's Democratic Republic, hepatitis B virus is highly endemic. However, blood donations are only screened for HBsAg, leaving a risk of transmission by HBsAg-negative occult infected donors. Here, we characterized first-time blood donors to assess prevalence of hepatitis B virus infections and occult infected donors. MATERIALS AND METHODS: Sera were screened for HBsAg, HBeAg and anti-HBs, anti-HBc and anti-HBe antibodies. Occult HBV infections (OBIs) were assessed in HBsAg-negative sera by PCR, and sera of HBsAg positive and occult infected donors were phylogenetically characterized. RESULTS: 9.6% of the donors were HBsAg positive, and 45.5% were positive for at least one of the hepatitis B virus serum markers. More than 40% HBsAg carriers were HBeAg positive, with HBeAg seroconversion occurring around 30 years of age. Furthermore, 10.9% of HBsAg-negative, anti-HBc and/or anti-HBs-positive donors were occult infected with hepatitis B virus. Thus, at least 3.9% of blood donations would potentially be unsafe, but hepatitis B virus DNA copy numbers greatly varied between donors. CONCLUSION: In Lao People's Democratic Republic, a sizable proportion of HBsAg-negative and anti-HBc antibody-positive blood donations are potentially DNA positive and infective for hepatitis B.

2014 Jan. Vox Sang.106(1):31-7. Epub 2013 Aug 12.
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