PMID: 11920813Mar 29, 2002Paper

Risk factors and mechanism of transplacental transmission of hepatitis B virus: a case-control study

Journal of Medical Virology
De-Zhong XuFu-Sheng Wang

Abstract

Intrauterine hepatitis B virus (HBV) infection has been suggested to be caused by transplacental transmission that cannot be blocked by hepatitis B vaccine. This would decrease the effectiveness of hepatitis B vaccine. This study examined the risk factors and mechanism of transplacental HBV transmission. A case-control study included 402 newborn infants from 402 HBsAg-positive pregnant women. Among these, 15 newborn infants infected with HBV by intrauterine transmission were selected as cases, and the rest as controls. A pathology study included 101 full-term placentas from the HBsAg-positive pregnant women above and 14 from HBsAg-negative pregnant women. Immunohistochemistry staining and HBV DNA in situ hybridization were used to estimate the association of intrauterine HBV infection and HBV infection in the placentas. HBeAg positivity in mothers' sera (OR = 17.07, 95%CI 3.39-86.01) and threatened preterm labor (OR = 5.44, 95%CI 1.15-25.67) were found to be associated with transplacental HBV transmission. The intrauterine infection rate increased linearly and significantly with maternal serum HBsAg titers (trend test P = 0.0117) and HBV DNA concentration (trend test P < 0.01). Results of the pathology study showed that HBV inf...Continue Reading

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