Objective: To explore the route that the HBsAg positive pregnant women's cell entered fetal circulation, and to study the mechanism of HBV intrauterine transmission that the cell transported HBV to fetus and infected fetus.
Methods: 123 pregnant women and 123 newborns were collected from December, 2001 to October, 2003 in Taiyuan Infectious Hospital. The cell transportion from mother to baby were determined by allele-specific PCR (AS-PCR) and heminested PCR(hemi-nPCR).
Results: Regarding GSTM1, ACE as maternal specific alleles: 42 mother-baby pairs were recruited from hemocyte specimens as informative cases, then examining 26 (61.90%) newborns' blood cell out of 42 informative cases had maternal cell DNA. There was significantly association between the cell transportion and HBV intrauterine infection (chi2 = 8.58, P < 0.01). There was significantly association between the cell transportion and HBV DNA positive in the newborns' PBMC (chi2 = 10.10, P < 0.01) .
Conclusion: One factor of HBV intrauterine infection is in the result of the cell transportion from mother to baby; PBMC carrying HBV probably passed through placent barrier into fetus and infected them.
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