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Infectious disease and microbiology – Orchitis
Orchitis is an inflammatory condition of the testes, most commonly caused by infection. It often occurs alongside epididymitis (epididymo-orchitis), in which case both conditions share similar causative organisms. Unlike many other genitourinary infections, viral causes—especially mumps—play a significant role, particularly in isolated orchitis. Although relatively uncommon compared to other urinary tract infections in men, orchitis is frequently encountered in outpatient settings and is associated with epididymitis in up to 20–40% of cases.
The infection typically develops through either direct spread from the epididymis or hematogenous dissemination in primary testicular infection. Risk factors include urethral catheterization, sexually transmitted infections (STIs), and underlying epididymitis, while prevention focuses on safe sexual practices and vaccination against mumps.
The etiology varies by age and risk profile. In younger men (14–35 years), the most common bacterial causes are Neisseria gonorrhoeae and Chlamydia trachomatis, whereas in older individuals, enteric Gram-negative bacteria such as Escherichia coli, Klebsiella, and Proteus predominate. Viral orchitis is most frequently caused by mumps virus, particularly in post-pubertal males, where it occurs in 20–30% of infections. Less commonly, fungi and rare pathogens such as Brucella or Mycobacterium tuberculosis may be involved.
Clinically, patients present with testicular pain, swelling, and tenderness, often accompanied by fever, nausea, and systemic symptoms. Viral orchitis, especially mumps-related, typically has an abrupt onset, often following parotitis by several days. The condition usually resolves within 1–2 weeks, although residual tenderness may persist. On examination, testicular enlargement with a preserved cremasteric reflex is typical, helping differentiate it from testicular torsion—a critical diagnosis that must always be excluded.
Diagnosis is based on clinical findings supported by laboratory tests and imaging. Urinalysis, urine culture, and testing for STIs (including PCR for Chlamydia and Gonorrhea) are essential. In suspected viral cases, serologic testing or PCR can confirm the diagnosis. Color Doppler ultrasonography is particularly important to rule out testicular torsion, which is the most urgent differential diagnosis.
Management depends on the underlying cause. Bacterial orchitis is treated with appropriate antibiotics, often covering both gonorrhea and chlamydia empirically (e.g., ceftriaxone plus doxycycline). Enteric infections are treated with β-lactam/β-lactamase inhibitors, cephalosporins, or fluoroquinolones. In contrast, viral orchitis has no specific antiviral treatment, and management is supportive, including rest, scrotal elevation, and cold compresses. Surgical intervention may be required in cases of abscess formation or complications.
The prognosis is generally favorable, especially in viral cases like mumps orchitis, which rarely leads to infertility, although testicular atrophy and abnormalities in sperm parameters may occur. Potential complications include testicular infarction, abscess formation, pyocele, and, rarely, infertility, emphasizing the importance of timely diagnosis and appropriate management.
Orchitis is an inflammatory condition of the testes, most commonly caused by infection. It often occurs alongside epididymitis (epididymo-orchitis), in which case both conditions share similar causative organisms. Unlike many other genitourinary infections, viral causes—especially mumps—play a significant role, particularly in isolated orchitis. Although relatively uncommon compared to other urinary tract infections in men, orchitis is frequently encountered in outpatient settings and is associated with epididymitis in up to 20–40% of cases.
The infection typically develops through either direct spread from the epididymis or hematogenous dissemination in primary testicular infection. Risk factors include urethral catheterization, sexually transmitted infections (STIs), and underlying epididymitis, while prevention focuses on safe sexual practices and vaccination against mumps.
The etiology varies by age and risk profile. In younger men (14–35 years), the most common bacterial causes are Neisseria gonorrhoeae and Chlamydia trachomatis, whereas in older individuals, enteric Gram-negative bacteria such as Escherichia coli, Klebsiella, and Proteus predominate. Viral orchitis is most frequently caused by mumps virus, particularly in post-pubertal males, where it occurs in 20–30% of infections. Less commonly, fungi and rare pathogens such as Brucella or Mycobacterium tuberculosis may be involved.
Clinically, patients present with testicular pain, swelling, and tenderness, often accompanied by fever, nausea, and systemic symptoms. Viral orchitis, especially mumps-related, typically has an abrupt onset, often following parotitis by several days. The condition usually resolves within 1–2 weeks, although residual tenderness may persist. On examination, testicular enlargement with a preserved cremasteric reflex is typical, helping differentiate it from testicular torsion—a critical diagnosis that must always be excluded.
Diagnosis is based on clinical findings supported by laboratory tests and imaging. Urinalysis, urine culture, and testing for STIs (including PCR for Chlamydia and Gonorrhea) are essential. In suspected viral cases, serologic testing or PCR can confirm the diagnosis. Color Doppler ultrasonography is particularly important to rule out testicular torsion, which is the most urgent differential diagnosis.
Management depends on the underlying cause. Bacterial orchitis is treated with appropriate antibiotics, often covering both gonorrhea and chlamydia empirically (e.g., ceftriaxone plus doxycycline). Enteric infections are treated with β-lactam/β-lactamase inhibitors, cephalosporins, or fluoroquinolones. In contrast, viral orchitis has no specific antiviral treatment, and management is supportive, including rest, scrotal elevation, and cold compresses. Surgical intervention may be required in cases of abscess formation or complications.
The prognosis is generally favorable, especially in viral cases like mumps orchitis, which rarely leads to infertility, although testicular atrophy and abnormalities in sperm parameters may occur. Potential complications include testicular infarction, abscess formation, pyocele, and, rarely, infertility, emphasizing the importance of timely diagnosis and appropriate management.
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