Discharges from neiseria gonnorie and trichomonas vaginalis
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Discharges in Neisseria gonorrhoeae and Trichomonas vaginalis
Neisseria gonorrhoeae (Gonorrhea)
Discharge Characteristics
| Feature | Description |
|---|---|
| Color | Milky white, yellow, or yellow-green |
| Consistency | Thick, purulent (pus-like) |
| Amount | Profuse/copious, especially in men |
| Odor | Mild to moderate |
- In men, the primary site is the urethra. After an incubation period of 2-7 days, the hallmark presentation is dysuria + thick purulent urethral discharge. The discharge is typically more florid and visible compared to chlamydial urethritis.
- In women, the primary site is the endocervix. Symptoms include increased vaginal discharge, urinary frequency, dysuria, and abdominal pain. However, a high percentage of female cases are asymptomatic, making diagnosis challenging. The discharge may be mucopurulent.
- Rectal gonorrhea can produce mucoid, sometimes bloody rectal discharge with tenesmus, though often asymptomatic.
- Comparison with chlamydia: Chlamydial discharge is typically scant, mucoid, less purulent; dysuria is less pronounced. Gonorrheal discharge is more profuse and frankly purulent.
Pathophysiology
Gonococci infect columnar epithelium (urethra, endocervix, rectum, pharynx). Inflammatory changes begin 2-7 days post-inoculation. The massive neutrophil response to the organism produces the characteristic pus-laden discharge. The complement system is important for controlling spread; individuals with complement deficiencies are at risk for disseminated gonococcal infection (DGI).
Complications Related to Discharge/Spread
- PID (10-20% of untreated women): salpingitis, pelvic peritonitis, tubo-ovarian abscess
- Infertility and ectopic pregnancy from tubal scarring
- Bartholin gland abscess (from spread to periurethral/vestibular glands)
- Ophthalmia neonatorum: purulent conjunctivitis in neonates born to infected mothers - formerly a major cause of blindness
Diagnosis
- Gram stain of discharge: shows intracellular Gram-negative diplococci within neutrophils (more sensitive in men than women)
- Culture of discharge/exudate
- NAATs (nucleic acid amplification tests): test of choice; can be done on urine, cervical, or vaginal swabs
Trichomonas vaginalis (Trichomoniasis)
Discharge Characteristics
| Feature | Description |
|---|---|
| Color | Yellow-green (classic) |
| Consistency | Frothy/foamy - hallmark feature |
| Amount | Profuse |
| Odor | Malodorous |
| pH | Elevated (≥4.5) |
T. vaginalis is a large, flagellated ovoid protozoan (exists only as a trophozoite) transmitted by sexual contact. It is an STI with worldwide incidence exceeding that of chlamydia and gonorrhea combined.
Clinical Presentation
- Women: malodorous profuse frothy vaginal discharge, vulvovaginal discomfort (itching/burning), dysuria, dyspareunia
- On examination: the vaginal and cervical mucosa has a fiery-red appearance; marked dilation of cervical mucosal vessels creates the classic "strawberry cervix" appearance (colposcopic finding of punctate cervical hemorrhages)
- Cervical petechiae may be visible
- Men: mostly asymptomatic; may occasionally have mild urethritis with scant discharge
Pathophysiology
Trichomonads induce contact-dependent cytotoxicity, leading to inflammation of the vaginal epithelium. This produces the mucosal erythema and the elevated vaginal pH (normal pH 3.8-4.5 rises to ≥4.5). The organism's flagella and undulating membrane are what produce the frothy nature of the discharge.
Diagnosis
- Wet mount microscopy: motile trichomonads with characteristic tumbling movement (fast, but lower sensitivity ~50-70%)
- NAATs and antigen detection tests: higher sensitivity, now preferred
- Trichomonas culture: more sensitive than wet mount
- Elevated vaginal pH (≥4.5)
Comparative Summary
| Feature | N. gonorrhoeae | T. vaginalis |
|---|---|---|
| Organism type | Gram-negative diplococcus (bacterium) | Flagellated protozoan |
| Discharge color | Yellow-white, purulent | Yellow-green |
| Discharge texture | Thick, pus-like | Frothy/foamy |
| Amount | Profuse (men) / variable (women) | Profuse |
| Odor | Mild | Malodorous |
| pH | Not typically elevated | ≥4.5 |
| "Strawberry cervix" | No | Yes |
| Men affected | Symptomatic | Mostly asymptomatic |
| Women affected | Often asymptomatic | Symptomatic |
| Incubation | 2-7 days | Days to weeks |
| Key complication | PID, infertility | HIV risk increase |
| Treatment | Ceftriaxone + azithromycin | Metronidazole |
| Co-treatment needed | Yes (cover chlamydia) | No |
Sources:
- Robbins & Kumar Basic Pathology, Gonorrhea section
- Robbins, Cotran & Kumar Pathologic Basis of Disease, Other Lower Female Genital Tract Infections
- Sherris & Ryan's Medical Microbiology, 8th Ed., p. 1204-1205
- The Washington Manual of Medical Therapeutics, Clinical Presentation
- ROSEN's Emergency Medicine, Clinical Features
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