Correlation between HBsAg expression pattern in maternal placenta and the occurrence of intrauterine infection in infants.

Out of the 33 samples of placental tissues examined, 15 were positive for immunostaining for HBsAg.Comparison of intrauterine infection rate between HBsAg positive and negative in decidual cell layers: χ2 = 0.268, P = 0.8000; comparison between HBsAg positive in decidual cell layers and negative in placenta: χ2 = 1.814, P = 0.1822.Comparison of intrauterine infection rate between HBsAg positive and negative in trophoblastic layer: χ2 = 0.268, P = 0.4308; and between HBsAg positive in trophoblastic layer and negative in placenta: χ2 = 2.052, P = 0.1938.Comparison of intrauterine infection rate between HBsAg positive and negative in capillary endothelial cells: χ2 = 10.313, P = 0.0088; and between HBsAg positive in capillary endothelial cells and negative in placenta: χ2 = 10.610, P = 0.0098.Comparison of intrauterine infection rate between HBsAg positive in decidual cell layer and trophoblastic layer: χ2 = 0.037, P = 0.3870; and between HBsAg positive in decidual cell layer and capillary endothelial cells: χ2 = 4.018, P = 0.07843.Comparison of intrauterine infection rate between HBsAg positive in trophoblastic layer and capillary endothelial cells: χ2 = 2.743, P = 0.1414.