I was browsing through the Times online Fertility File and found this interesting article about Chlamydia and male fertility.
It is well known that Chlamydia can affect female fertility adversely by causing infection in the female urogential tract and blocking the fallopian tubes. Chlmaydia can also be a cause of recurrent miscarriage if untreated.
Here is an extract from the article
Chlamydia, the sexually transmitted infection (STI) carried by one in ten sexually-active young British adults can make men infertile by damaging the quality of their sperm, new research has shown.
While the condition, which usually passes undetected, has long been known to threaten female fertility, scientists from Spain and Mexico have now established that it presents similar risks for men.
Men with chlamydia have three times the normal number of sperm with genetic damage that can impair their ability to father children, the study found.
Antibiotic treatment can reverse the effect, and preliminary results indicate that it may dramatically enhance pregnancy rates when couples are trying for a baby. But the discovery suggests that the prevalence of the disease may be contributing to infertility across an entire generation of young adults.