Introduction

Pyospermia, also known as leukocytospermia, is defined by an elevated number of leukocytes in the ejaculate, commonly accepted as >1 × 10^6 white blood cells/mL, detected via peroxidase staining or immunocytochemistry.^1,2 It is suspected in men undergoing fertility evaluation when routine semen analysis reveals an unusually high round‐cell count. The presence of these inflammatory cells may indicate overt infections of the male genital tract (MGT) or subclinical inflammation, both of which can impair semen parameters and fertilisation potential.²

Testicular infections encompass a spectrum of inflammatory conditions affecting the epididymis, testis, or both. Among these, orchitis-acute or chronic inflammation of the testicle, plays a pivotal role in male reproductive health. Etiologically, orchitis may arise from sexually transmitted bacteria (e.g., Chlamydia trachomatis, Neisseria gonorrhoeae), uropathogens (e.g., Escherichia coli) ascending from the urethra, or viral agents, most notably the mumps virus.^3,4

Understanding the interplay between orchitis and pyospermia is critical, as testicular inflammation often leads to increased leukocyte migration into semen, ductal obstruction, and reactive oxygen species (ROS) mediated sperm damage. This essay examines the mechanisms by which orchitis contributes to pyospermia, its diagnostic evaluation, therapeutic strategies, and implications for male fertility.

Pyospermia: pathophysiology, diagnosis, and clinical significance

Leukocytes in semen originate primarily from the prostate, seminal vesicles, and epididymis. Under normal conditions, these phagocytic cells aid in clearing debris; however, in pyospermia, their overabundance reflects infection or excessive inflammation.^2,5 Activated neutrophils generate ROS and proteolytic enzymes, which, at high concentrations, damage sperm membranes, DNA integrity, and motility.^6,7 Prolonged exposure to ROS precipitates lipid peroxidation and apoptotic pathways in spermatozoa, contributing to subfertility or infertility.⁷

Clinically, pyospermia may present with dysuria, perineal discomfort, or be entirely asymptomatic. Semen analysis is the cornerstone of diagnosis: >1 × 10^6 leukocytes/mL by peroxidase staining or flow cytometry confirms pyospermia.^1,2 Additional evaluations include semen culture to identify pathogens, polymerase chain reaction (PCR) assays for sexually transmitted infections (STIs), and measurement of ROS levels. The predictive value of leukocytospermia for infection is debatable: some studies report a limited correlation between leukocyte count and positive cultures, underscoring the need for comprehensive assessment.⁶

Management decisions depend on symptomatology and culture results. Empiric antibiotics, such as doxycycline or fluoroquinolones, are often prescribed when pyospermia persists despite negative cultures, given the potential for occult infection ⁸. Adjunctive measures, including antioxidants, anti‐inflammatory agents and frequent ejaculation, may ameliorate semen parameters, though robust data on live‐birth outcomes remain sparse.^2,8

Testicular infections and orchitis: etiology and mechanisms

Testicular infections manifest as epididymitis, orchitis, or epididymo‐orchitis. Bacterial orchitis predominantly arises from ascending infection of the epididymis; common pathogens include Chlamydia trachomatis, Escherichia coli, and Neisseria gonorrhoeae.^3,9 Viral orchitis is most frequently a complication of postpubertal mumps, occurring in approximately one‐third of males who contract mumps after puberty.⁴

Once pathogens invade the testicular environment, they trigger a cascade of immune responses. Local release of cytokines (e.g., interleukin-1, tumor necrosis factor-α) increases vascular permeability, leading to leukocyte extravasation into the testicular interstitium and seminiferous tubules.⁹ Neutrophils and macrophages, while essential for microbial clearance, release ROS and proteases that can disrupt the blood–testis barrier and impair spermatogenesis.^7,10 These inflammatory mediators not only contribute to orchitic pain and swelling but also facilitate leukocyte migration into the ejaculate, manifesting as pyospermia.

Orchitis as a contributor to pyospermia

Orchitis directly elevates seminal leukocyte counts by recruiting immune cells to sites of testicular inflammation. In epididymo-orchitis, both epididymal and testicular tissues are involved, compounding the inflammatory load³. Clinical studies have demonstrated significantly higher leukocyte concentrations in the semen of men with documented orchitis compared to uninfected controls.¹¹

Obstruction of the efferent ducts, secondary to edema and fibrosis from chronic orchitis, further exacerbates pyospermia by causing stasis and accumulation of inflammatory secretions proximal to the blockage.¹² Moreover, chronic orchitis may lead to testicular atrophy, reduced testosterone production, and impaired spermatogenesis, resulting in oligo- or azoospermia in severe cases.^4,9 The combined effect of ductal obstruction and parenchymal damage underscores the critical role of orchitis in male infertility.

Diagnostic evaluation

A thorough workup for suspected orchitis–related pyospermia comprises:

1. Medical History and Physical Examination
   • Assessment of scrotal pain, swelling, systemic symptoms (fever)
   • Digital rectal examination to evaluate prostate tenderness
2. Semen Analysis
   • Quantification of leukocytes (>1 × 10^6/mL) via peroxidase stain
   • Semen culture and PCR for STIs (e.g., Chlamydia, Neisseria)^1,2,6
3. Scrotal Ultrasonography
   • High-resolution imaging to detect testicular enlargement, hyperemia, abscess formation, or ductal obstruction³
4. Urine Studies
   • First-void urine nucleic acid amplification tests (NAATs) for urethral pathogens
   • Midstream urine culture to rule out urinary tract infection

Integration of these modalities allows differentiation between isolated pyospermia, epididymitis, prostatitis, and orchitis, facilitating targeted therapy.

Treatment and management

The therapeutic approach addresses both infection and inflammation to restore semen quality and preserve fertility.

1. Antibiotic Therapy
   • Empiric regimens targeting Chlamydia and common uropathogens (e.g., doxycycline 100 mg BID × 10–14 days; levofloxacin 500 mg daily × 10 days)^8,9
   • Culture‐directed antibiotics for identified pathogens
2. Anti-inflammatory and Supportive Measures
   • Nonsteroidal anti-inflammatory drugs (NSAIDs) are used to reduce pain and swelling
   • Scrotal elevation and cold compresses for symptomatic relief
3. Adjunctive Therapies
   • Antioxidants (e.g., vitamin C, vitamin E) to counteract ROS‐mediated sperm damage²
   • Frequent ejaculation to clear leukocyte-rich secretions and reduce stasis
4. Management of Complications
   • Drainage of abscesses, if present
   • Surgical intervention (e.g., epididymectomy) in refractory chronic epididymo-orchitis

Early and adequate treatment of orchitis not only alleviates acute symptoms but also mitigates long‐term sequelae such as ductal obstruction and testicular atrophy, thereby improving semen parameters and fertility prospects.^4,9

Prevention and fertility considerations

Primary prevention of orchitis and related pyospermia focuses on:

• Safe Sexual Practices
  • Condom use and screening for STIs to reduce ascending infections
• Vaccination
  • Mumps–measles–rubella (MMR) vaccination to prevent viral orchitis in postpubertal males⁴
• Prompt Treatment of Urogenital Infections
  • Early therapy for urethritis or prostatitis to avert spread to the epididymis and testis

In men with persistent infertility despite resolution of infection, assisted reproductive techniques (ART), such as intrauterine insemination (IUI) or in vitro fertilisation (IVF), may be indicated. Semen preparation methods (e.g., density‐gradient centrifugation) can further enrich spermatozoa while removing leukocytes and ROS.^2,13

Conclusion

Orchitis stands as a significant contributor to pyospermia and male infertility. The inflammatory milieu engendered by testicular infection not only elevates seminal leukocyte counts but also fosters ROS‐mediated sperm damage and ductal obstruction. Accurate diagnosis, integrating semen analysis, microbiological testing, and scrotal imaging, is essential for targeted therapy. Combined antibacterial, anti‐inflammatory, and supportive measures can restore semen quality, while preventive strategies, including STI prevention and vaccination, reduce incidence. Recognition of orchitis’s impact on fertility should prompt early intervention, and when necessary, referral for ART to maximise reproductive outcomes.