Acute bacterial prostatitis is caused by:

Ref. Textbook of Microbiology and Immunology BY Parija. Page. 182, 261   Bacterial prostatitis is usually caused by E. coli or another gram-negative rod, with one of two presentations. Acute bacterial prostatitis presents with fever and chills; prostate examination should be gentle or not performed at all, as massage may result in a wave of bacteremia. Chronic bacterial prostatitis presents as recurrent episodes of bacterial cystitis