[Impact of male reproductive tract infection on semen quality].

Objective: To investigate the association of male reproductive tract infection (RTI) with semen parameters and sperm DNA damage.

Methods: We classified 1 084 males attending the infertility clinic into an RTI group (n = 300) and a non-RTI control group (n = 784). According to the WHO standards, we obtained routine semen parameters, detected sperm morphology, and determined the sperm DNA fragmentation index (DFI) by sperm chromatin structure assay.

[Clinical study on in vitro maturation of immature oocytes transferred from conventional in vitro fertilization.].

Objective: To investigate clinical effect of in vitro maturation (IVM) of immature oocytes transferred from conventional in vitro fertilization embryo transfer (IVF-ET) cycles.

Methods: From January 2008 to June 2009, medical documents of 155 infertile patients underwent IVF-ET in the Reproductive Medical Center of First Affiliated Hospital of Wenzhou Medical College were analyzed retrospectively. If more than 20 oocytes were monitored after 5 - 7 days of ovulation induction or follicular developmental retardation were confirmed after 8 - 13 days of ovulation induction, according to patients' wish, IVM were transferred in 60 cycles (group A).