Acute Bacterial Prostatitis
Acute bacterial infection of the prostate — fever, pelvic pain, exquisitely tender prostate; treat with prolonged antibiotics.
Also known as: acute prostatitis, bacterial prostatitis, ABP
Overview
Acute bacterial infection of the prostate gland (NIH Category I), typically presenting with systemic illness and lower urinary tract symptoms. Distinct from chronic bacterial prostatitis (II), chronic pelvic pain syndrome (III), and asymptomatic inflammatory prostatitis (IV).
Epidemiology
Most common in men 20-40 and >70 years. Accounts for ~5% of all prostatitis cases. Often complicates urinary instrumentation or BPH.
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Risk factors
- BPH with bladder outlet obstruction
- Recent urinary catheterization or instrumentation (cystoscopy, TRUS biopsy)
- Indwelling catheter
- Anal intercourse (especially with insertive partner)
- Phimosis, urethral strictures
- Immunocompromise (diabetes, HIV)
- Prior urinary tract infection
Pathophysiology
Ascending infection from urethra (most common), reflux of infected urine through prostatic ducts, or hematogenous seeding. Common organisms: E. coli (most common, ~60-80%), Klebsiella, Proteus, Pseudomonas, Enterococcus; Neisseria gonorrhoeae and Chlamydia in younger sexually active men.
Clinical presentation
Symptoms
- Fever, chills, rigors
- Lower abdominal, perineal, or low back pain
- Dysuria, frequency, urgency, hematuria
- Hesitancy, weak stream, retention
- Painful defecation, painful ejaculation
- Generalized malaise, myalgias
Signs / physical exam
- Fever, tachycardia, possibly hypotension if septic
- Exquisitely tender, warm, boggy, edematous prostate on gentle DRE
- Suprapubic tenderness, distended bladder if retention
- AVOID prostatic massage — risk of bacteremia
Classic findings
Older man (or younger with recent instrumentation) with fever, perineal pain, urinary symptoms, and exquisitely tender prostate on DRE.
Differential diagnosis
- Acute pyelonephritis — CVA tenderness, fever; same organisms; can coexist with prostatitis
- Urinary tract infection (cystitis) — Dysuria without prostate tenderness or fever
- Epididymo-orchitis — Testicular pain, swelling; positive Prehn sign (relief with elevation)
- Urethritis (gonococcal/chlamydial) — Discharge, dysuria; younger sexually active men
- Prostatic abscess — Persistent symptoms despite antibiotics; fluctuant mass on DRE; imaging with TRUS or CT
- Chronic bacterial prostatitis — Recurrent UTIs with same organism, episodic; less acute systemic illness
- Chronic pelvic pain syndrome (CPPS) — Pelvic pain ≥3 months without infection
Diagnostic workup
Labs
- Urinalysis with leukocyte esterase, nitrites; urine culture and sensitivity
- CBC (leukocytosis), BMP, lactate
- Blood cultures if febrile/septic
- PSA often markedly elevated during infection — defer screening until resolution
- NAAT for GC/CT in sexually active younger men
- HIV, syphilis screening in at-risk populations
Imaging
- Often not needed initially if responsive to therapy
- Transrectal ultrasound or pelvic CT/MRI — if abscess suspected (persistent fever/symptoms after 48-72 h of antibiotics, palpable fluctuance, immunocompromise)
- Post-void residual / renal ultrasound if retention or AKI
Diagnostic algorithm
| NIH Category | Diagnosis | Key Features | Treatment |
|---|---|---|---|
| I — Acute bacterial prostatitis | Acute febrile illness with UTI | Fever, tender prostate; positive urine culture | Antibiotics × 4-6 weeks (fluoroquinolone or TMP-SMX) |
| II — Chronic bacterial prostatitis | Recurrent UTIs with same organism, episodic | Pelvic discomfort between flares; positive cultures intermittently | Prolonged antibiotics × 4-12 weeks |
| IIIa — Inflammatory CPPS | Chronic pelvic pain >3 mo, WBCs in EPS/VB3, negative cultures | No identifiable infection | Alpha-blocker, NSAID, multimodal |
| IIIb — Non-inflammatory CPPS | Chronic pelvic pain, no WBCs, negative cultures | May involve pelvic floor dysfunction | Multimodal therapy |
| IV — Asymptomatic inflammatory | Incidental finding on biopsy or EPS WBCs | Asymptomatic | Usually no treatment |
Treatment
First-line
- Outpatient (mild-moderate, hemodynamically stable, no abscess, tolerating PO):
- • Fluoroquinolone — ciprofloxacin 500 mg PO BID OR levofloxacin 500 mg PO daily × 4-6 weeks
- • OR trimethoprim-sulfamethoxazole DS BID × 4-6 weeks
- Inpatient (severe illness, sepsis, immunocompromise, retention):
- • Broad-spectrum IV — piperacillin-tazobactam, ceftriaxone, OR cefepime ± aminoglycoside (gentamicin)
- • Transition to oral fluoroquinolone or TMP-SMX once clinically improving
- • Total duration 4-6 weeks (some sources 2-4 weeks for acute, longer for chronic)
- Younger sexually active men: ceftriaxone 500 mg IM + doxycycline 100 mg PO BID × 10-14 days for GC/CT coverage
Prostatic abscess
- Suspect if symptoms persist despite 48-72 h of appropriate antibiotics
- Diagnosis: TRUS or CT/MRI pelvis
- Drainage: transrectal or transperineal aspiration/drainage; transurethral resection in some cases
- Continue IV antibiotics with anaerobic coverage
- Common in diabetics, immunocompromised, HIV patients
Second-line / adjunct
- Adjust antibiotics based on culture sensitivities
- Antipyretics, analgesics, hydration
- Stool softeners to reduce defecation pain
- Urinary retention: SUPRAPUBIC catheter preferred (urethral catheter may worsen infection); if not feasible, gentle small-caliber Foley
- Alpha-blocker (tamsulosin) for voiding symptoms
Complications
- Sepsis, septic shock
- Prostatic abscess
- Acute urinary retention
- Chronic bacterial prostatitis (~5% develop)
- Epididymo-orchitis
- Bacteremia and metastatic infection
- Pyelonephritis
PANCE pearls
- AVOID vigorous prostatic massage in acute bacterial prostatitis — can precipitate bacteremia and sepsis.
- Fluoroquinolones and TMP-SMX penetrate prostatic tissue well; many other antibiotics (cephalosporins, penicillins) penetrate poorly into normal prostate but enter inflamed prostatic tissue more readily during acute infection.
- PSA often markedly elevated during acute prostatitis — defer prostate cancer screening for 6-8 weeks after resolution.
- For urinary retention complicating acute bacterial prostatitis, suprapubic catheter is preferred over urethral catheter (urethral catheter may worsen inflammation and bacteremia).
- Treatment duration is 4-6 weeks for acute bacterial prostatitis — longer than typical UTI because of biofilm and tissue penetration challenges.
- Failure to improve in 48-72 hours warrants imaging to rule out prostatic abscess.
- Younger sexually active men require coverage for Neisseria gonorrhoeae and Chlamydia trachomatis (ceftriaxone + doxycycline).
References
- AUA 2010 — Diagnosis and Treatment of Prostatitis: AUA Guideline; subsequent updates
- EAU 2024 — EAU Guidelines on Urological Infections (Bonkat et al., 2024)
- CDC STI Guidelines 2021 — CDC Sexually Transmitted Infections Treatment Guidelines, 2021 (MMWR Recomm Rep 2021)
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