It is a very common bacteria. It may occur with using dirty toilets, from sexual partner, not cleaning underwear regularly and most of the time source can not be found. Prevention is following: flushing the urinal before and after use, washing and ironing underwear daily, using condoms if sexual partner is infected, these precautions should be taken by the sexual partner also, because sexual partner may be infected same way.
In your semen culture reports if drug sensitivity is not done then please do it after which appropriate antibiotics will cure it.
Next Steps
If you want medicine then go for paid consultanion for online prescription by uploading semen culture and sensitivity test report and blood
sugar PP report.