My brother is 23 years old guy. He has uti from last 2 months. There are 100+ pus cells, burning and pain in penis, and yellow semen. He took doctor's prescription, took antibiotics, monocef injections. But, now there is pain in his stomach and also on penis. And also discomfort while masturbating and yellow semen, painful after ejaculation. Urine culture is negative, usg of kub is also fine how to treat this. And what could be the reason for this infection.