Pus cells in the semen can be a natural occurrence and it is common to have even trace amounts of pus cells in healthy patients. When the concentration of these pus cells increases, however, it could but quite detrimental to male patients. A pus cell is just a generic term used to describe the presence of white blood cells (WBC) in the semen.
When there is an infection in the body, WBCs are launched to attach the invader to preserve immunity throughout the body. When there is some infection along the urinary tract, these pus cells can become prevalent in the semen and may compromise the quality of the semen.
In one study, it was determined that there was a correlation between the level of pus cells and the chances of infertility in a patient. Subjects who had already had children in this study tended to have lower levels of pus cells compared males who were yet to father a child. There was also an inverse relationship between the number of pus cells and the motility of the sperm. The higher the concentration of pus cells, the harder it was for sperm to mobilize, which could directly explain why patients would have a hard time fathering a child. If sperm is already immobile before it leaves the male patient, it will be impossible for it to travel through the female reproductive system to fertilize an egg. 
The prognosis of these patients varies based on the sources you will look at. Prognostic projections indicate that between 8 to 35 percent of patients suffering from genital tract infections will be infertile the rest of their lives.
Studies have also found that the most damaging bacteria to sperm motility seemed to be simple E. coli, a bacteria responsible for most types of UTIs. Some believe that when you treat the infections, gradually, the sperm will regain their motility and patients will be able to healthier sperm once again but this comes with a significant caveat.
These bacteria are more likely to become resistant to antibiotics when the patient is an older age but with new strains of these bacteria becomes more concentrated worldwide, it will only be a matter of time before these bacteria become more commonly seen in infections.
As a result, male genitourinary tract infections represent one of the leading causes worldwide of male infertility. Thankfully, the anatomy of the penis is a preventative factor in catching UTIs but males can help their cause for fertility by using protection during intercourse to reduce their chances of contracting STDs and other bacteria linked with sperm destruction.
What is becoming more commonplace in modern society is patients coming into clinics at a younger age also to freeze sperm samples in the event they lose their sperm quality as they age. The best approach would be to go to a urologist immediately when you notice a change in your urinary frequency to begin treatment as quickly as possible. The longer you wait, the more damaging the infection can be. 
Still have something to ask?
Get help from other members!