Hepatitis B virus infection reduces fertilization ability during in vitro fertilization and embryo transfer

Whether hepatitis B virus (HBV) infection impairs human infertility is unclear. The present retrospective case-controlled study investigated the impact of HBV on sperm parameters, ovarian stimulation, and outcomes of in vitro fertilization (IVF) and embryo transfer. A total of 224 couples with at least one partner being HBsAg-seropositive undergoing their first IVF and embryo transfer cycle were identified, which included 77 couples with female partners being HBsAg-seropositive, 136 couples with male partners being HBsAg-seropositive, and 11 couples with both partners being HBsAg-seropositive. A total of 448 both HBsAg-seronegative couples served as controls. The percentage of normal sperm morphology was significantly lower in HBsAg-seropositive male partners than that in HBsAg-seronegative male partners (11.9±9.4% vs. 19.0±11.9%, P<0.01). The duration of infertility was significantly prolonged in HBV-seropositive patients compared with HBV-seronegative patients (4.9 vs. 4.1 years, P<0.01). Couples with female partners being HBsAg-seropositive had significantly lower top-quality embryo rate than control group (22.4% vs. 31.6%, P<0.01). In addition, the fertilization rates in groups with male or female partners being HBsAg-seropositive were both significantly lower than the matched controls (80.2% vs. 82.8%, P<0.05; 76.6% vs. 84.3%, P<0.01, respectively). HBV infection was also found to be associated negatively with fertilization rate by logistic regression analysis (odds ratios: 0.410, 95% confidence interval: 0.186-0.906, P<0.05). However, there was no significant difference in clinical pregnancy rates between HBsAg-seropositive and HBsAg-seronegative group. These results suggest that chronic HBV infection is likely to represent a significant cause of infertility.