Prostatitis Caused by Escherichia coli

Prostatitis caused by Escherichia coli is a bacterial infection of the prostate gland that can lead to painful urination, pelvic discomfort, and flu-like symptoms. Understanding this condition helps patients recognize when to seek medical care and how treatment can effectively address the infection.

Table of contents

• What Is Bacterial Prostatitis Caused by E. coli
• How the Infection Develops
• Signs and Symptoms
• How Doctors Diagnose the Condition
• Treatment Options
• Prevention and Risk Factors

What Is Bacterial Prostatitis Caused by E. coli

Prostatitis is inflammation or swelling of the prostate gland, a walnut-sized organ that sits just below the bladder in men^[1]. The prostate surrounds the upper part of the tube that carries urine out of the body, called the urethra, and produces fluid that is part of semen^[2].

When bacteria cause this inflammation, it is called bacterial prostatitis. Escherichia coli (E. coli) is the most common bacteria responsible for this infection, causing approximately 50% to 90% of all bacterial prostatitis cases^[5]. E. coli normally lives in the intestines but can cause infection when it enters the urinary tract and prostate^[6].

Bacterial prostatitis can be either acute or chronic. Acute bacterial prostatitis starts suddenly with severe symptoms and requires immediate medical attention^[1]. Chronic bacterial prostatitis is a persistent infection lasting three months or longer, with symptoms that are usually less severe but can come and go over time^[4].

• Prostate gland
• Urethra
• Bladder
• Epididymis

How the Infection Develops

In men over age 35, E. coli and other common bacteria are the most frequent causes of prostatitis^[1]. The infection typically develops when bacteria travel up the urethra or when urine flows backward into the prostate tissue^[3].

The infection may begin in several areas of the urinary and reproductive system. It can start in the epididymis, a small tube that sits on top of the testicles, or in the urethra itself^[1]. Sometimes bacteria spread directly from the rectum or through the bloodstream during a severe infection elsewhere in the body^[3].

Medical procedures can also introduce bacteria into the prostate. These include urinary catheter insertion, cystoscopy (a procedure to look inside the bladder), prostate biopsy, and other procedures involving the urinary tract^[5]. After these procedures, there is an increased risk of infection from E. coli and other organisms^[3].

Certain conditions make bacterial prostatitis more likely to develop. Men age 50 or older who have an enlarged prostate face a higher risk because the prostate gland may become blocked, making it easier for bacteria to grow^[1]. Other risk factors include blockages that prevent urine from flowing properly out of the bladder, a foreskin that cannot be pulled back, and injury to the area between the scrotum and anus^[1].

Signs and Symptoms

The symptoms of bacterial prostatitis caused by E. coli depend on whether the infection is acute or chronic. Both types share many similar symptoms, but acute bacterial prostatitis tends to be more severe and comes on suddenly^[1].

Acute bacterial prostatitis often causes flu-like symptoms including fever, chills, body aches, and flushing of the skin^[1]. Men may feel generally unwell with nausea and tenderness in the lower abdomen^[3]. The symptoms can be serious enough to require hospitalization, especially if sepsis develops^[7].

Urinary symptoms are common with both acute and chronic forms. These include burning or pain during urination, difficulty starting the urine stream or keeping it going, needing to urinate frequently (especially at night), and an urgent need to urinate^[1][2]. Some men notice their urine stream is weak or that it stops and starts^[1].

Pain can occur in several areas. Men may experience pain or aching in the lower abdomen above the pubic bone, in the lower back, in the area between the genitals and anus (called the perineum), or in the testicles^[1][2]. Pain may also occur during ejaculation or bowel movements^[1].

Other possible symptoms include cloudy or foul-smelling urine, blood in the urine or semen, and difficulty emptying the bladder completely^[1]. In severe cases of acute prostatitis, the swollen prostate can block urine flow entirely, which is a medical emergency requiring immediate treatment^[7].

Chronic bacterial prostatitis causes similar symptoms, but they are usually less severe and develop more gradually^[1]. Some men experience no symptoms between episodes of infection^[1]. This form presents as recurring urinary tract infections with the same bacteria identified repeatedly^[4].

How Doctors Diagnose the Condition

Diagnosis of bacterial prostatitis caused by E. coli is made primarily based on symptoms and physical examination, supported by laboratory tests^[3].

During the physical exam, the doctor performs a digital rectal exam to check the prostate. The doctor inserts a gloved, lubricated finger into the rectum to feel the prostate gland^[1]. In acute bacterial prostatitis, the prostate typically feels swollen and tender, while in chronic infection it may feel large and soft^[1]. The exam should be done gently to reduce the risk of spreading bacteria into the bloodstream^[1].

The physical examination may also reveal enlarged or tender lymph nodes in the groin, fluid coming from the urethra, or a swollen or tender scrotum^[1]. The doctor may check the abdomen and might find a distended bladder if urine retention has occurred^[6].

Urine samples are collected for urinalysis and urine culture. These tests help confirm the presence of bacteria and identify the specific organism causing the infection^[1]. Urine cultures should be obtained in all patients suspected of having acute bacterial prostatitis to determine which bacteria is responsible and which antibiotics will work against it^[3]. A midstream clean-catch urine sample is typically used^[3].

Blood tests may be performed to check for signs of infection^[1]. Blood cultures are particularly important in patients with fever higher than 101.1°F (38.4°C), those who appear very ill, or those with weakened immune systems^[3].

The prostate-specific antigen (PSA) blood test, normally used to screen for prostate cancer, may show elevated levels during prostatitis. However, this increase is due to the infection and inflammation, not cancer^[1][12]. PSA levels typically decline after successful treatment, although this may take three to six months^[12].

In some cases, prostatic massage may be performed during the rectal exam to release prostate fluid into the urethra, which can then be collected and tested for infection^[9]. However, this should not be done in acute bacterial prostatitis because it can spread bacteria into the bloodstream^[1][3].

Imaging tests are usually not necessary but may be ordered if symptoms don’t improve with treatment or if a complication like a prostate abscess is suspected^[3]. Fevers lasting longer than 36 hours should be evaluated with imaging to check for an abscess^[3].

Treatment Options

Treatment of bacterial prostatitis caused by E. coli centers on antibiotics, supportive care, and managing symptoms^[1].

Antibiotics are the main treatment for bacterial prostatitis. For acute prostatitis, antibiotics are typically taken for 2 to 6 weeks^[1]. The specific antibiotic chosen depends on the bacteria identified in urine cultures and which medications it is sensitive to^[3].

Fluoroquinolones, particularly ciprofloxacin and levofloxacin, are commonly used because they penetrate well into prostate tissue^[10][12]. Other options include a combination of ceftriaxone with doxycycline, or piperacillin/tazobactam^[3]. However, growing bacterial resistance to fluoroquinolones is a concern, and doctors must consider local resistance patterns when choosing treatment^[10].

Most patients with acute bacterial prostatitis can be treated at home with oral antibiotics and supportive care^[3]. However, hospitalization and intravenous antibiotics may be needed for patients who appear very ill, cannot urinate on their own, cannot tolerate oral medications, or have risk factors for antibiotic-resistant bacteria^[3].

For chronic bacterial prostatitis, antibiotics are taken for at least 2 to 6 weeks, and sometimes up to 12 weeks^[1]. Because the infection can return, some men may need to take medicine for extended periods^[1]. The infection may not go away completely even after long courses of antibiotics, and symptoms may return when medication is stopped^[1].

Additional medications help manage symptoms. Alpha-blockers can relax muscles in the prostate and bladder neck, improving urine flow and reducing obstruction^[10]. Pain relief can be achieved with nonsteroidal anti-inflammatory drugs (NSAIDs) or other pain medications^[4][12]. Fever and body aches can be treated with antipyretics^[10].

If the swollen prostate makes it difficult or impossible to empty the bladder, a tube called a catheter may be inserted to drain urine. This can be placed through the penis or through the abdomen^[1]. A urinary catheter inserted gently for severe obstruction can often be removed after 24 to 36 hours^[10].

Home care measures support recovery. Patients should urinate often and completely, take warm baths to relieve pain, and take stool softeners to make bowel movements easier and less painful^[1]. Staying well-hydrated helps dilute urine and flush the bladder^[16]. Increasing fluid intake and bed rest are also recommended^[10].

If symptoms don’t improve with initial treatment, patients should be referred to a specialist in urology^[15]. In rare cases where a prostate abscess forms and doesn’t respond to antibiotics, surgical drainage may be necessary^[10].

Prevention and Risk Factors

Several factors increase the risk of developing bacterial prostatitis caused by E. coli. Understanding these risk factors can help with prevention efforts.

Men with conditions that facilitate bacteria entering the urethra and prostate are at higher risk^[3]. These include benign prostatic enlargement, urethral stricture (narrowing), and phimosis (inability to pull back the foreskin)^[3].

Other genitourinary infections increase risk, including epididymitis (infection of the epididymis), orchitis (infection of the testicles), urethritis (infection of the urethra), and urinary tract infections^[3]. A history of sexually transmitted diseases also raises the risk^[3].

Medical procedures involving the prostate or urinary tract carry infection risk. These include cystoscopy, transrectal prostate biopsy, transurethral surgery, urethral catheterization, and urodynamic studies^[3][5]. The risk of developing prostatitis after medical procedures can be reduced by using preventive antibiotics, such as ciprofloxacin, before transrectal prostate biopsy^[3].

Immunocompromised patients face higher risk of infection from atypical organisms beyond just E. coli^[5].

Lifestyle measures may help prevent prostatitis or reduce recurrences. Staying hydrated helps keep the bladder flushed^[16]. Men who experience repeated episodes should use cushions when sitting for long periods and stay as active as possible^[16]. Practicing safe sex and avoiding high-risk sexual behaviors can reduce exposure to sexually transmitted infections that may lead to prostatitis^[3].

Community-acquired infections with E. coli are three times more common than infections acquired in healthcare settings^[3]. The incidence of acute bacterial prostatitis peaks in two age groups: men aged 20 to 40 and men over 70^[3].