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Male infertility can have different causes, one of which may be the presence of etiologic agents that cause sexually transmitted infections. Among the most important sexually transmitted infections are human papillomavirus and Chlamydia trachomatis, which are as‐ sociated with infertility in females – whether they cause infertility in men is controversial. The purpose of the chapter is to review the effect of these two pathogens on male fertility, the evidence suggests that the most important infertility effect is linked to the condition of the sperm. However, it is noteworthy that there are few studies with respect to infertil‐ ity in regard to both pathogens, so it is important to further research this to elucidate the mechanisms by which these pathogens act on male infertility.

Decrease in Sperm Quality due to Infection of Human Papilloma Virus and Chlamydia trachomatis