Continues here:For over a hundred years chronic prostatitis was considered an infectious disease of bacterial origin and when antibiotics became available it was believed that it would probably be relegated to the wastebasket of cured diseases [1]. However, despite this promise, antibiotics did not cure most of the patients with prostatitis and with better understanding of microbiology, uropathogenicity and the condition itself, we came to the conclusion that perhaps it was not caused by bacteria or other infectious agents after all. We finally defined the condition of National Institutes of Health (NIH) category III chronic prostatitis/chronic pelvic pain syndrome (CP/CPPS) by the absence of bacterial infection by a recognized uropathogen identified using traditional culture techniques as a cause for the chronic pain and urinary symptoms. This left the door open to further discoveries that infection might play a role in the etiology or pathogenesis of CP/CPPS (using other methods etc). In fact, it has only been several decades when a disease believed to be due to genetics, increased gastric acidity and stress, was discovered to be due to Helicobacter pylori and gastritis is now treated with appropriate antimicrobial therapy instead of radical surgery. Could there be a microorganism cause for CP/CPPS, but we just cannot identify it?
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5419111/