Neisseria gonorrhoeae

Gram ⊖Gram-negative, kidney-bean-shaped diplococci

Neisseria gonorrhoeae

A Gram-negative diplococcus causing sexually transmitted urethritis/cervicitis, Pelvic Inflammatory Disease (PID), and septic arthritis in young adults.

🎬 The Gonzo Gala
A scandalous gala at a diplo-coccus-shaped club where a gonzo journalist reports on purulent cocktails, inflamed joints on the dance floor, and a special VIP lounge.
The Gonzo Gala1 / 18
1
Gram negative diplococci gonorrhoeae

Neisseria gonorrhoeae are Gram-negative, kidney bean-shaped diplococci.

🔗 The organism's morphology is directly depicted by the protagonists' shape: two (diplo-) round, kidney-bean-shaped (reniform cocci) creatures made of pink/red coral (Gram-negative).

🔬 Identification & Lab Diagnosis

  • •Gram-negative, kidney bean-shaped diplococci, often found intracellularly within neutrophils on Gram stain of discharge.
  • •Cultured on selective Thayer-Martin medium (chocolate agar with Vancomycin, Polymyxin/Colistin, Nystatin).
  • •Ferments glucose but NOT maltose, distinguishing it from N. meningitidis (ferments both).
  • •Nucleic Acid Amplification Test (NAAT) is the gold standard for diagnosis, typically performed on urine or swabs.
  • •Urinalysis may show 'sterile pyuria' (WBCs present without bacteria on standard culture) due to its fastidious nature.

⚔️ Virulence Factors

  • •Pili demonstrate antigenic variation, allowing for immune evasion and preventing the development of lasting immunity.
  • •IgA protease cleaves secretory IgA at the hinge region, facilitating colonization of mucosal surfaces.
  • •Lipooligosaccharide (LOS) in the outer membrane acts as an endotoxin, stimulating a potent inflammatory response.

🩺 Clinical Presentation

  • •Localized infection causes purulent urethritis in men and cervicitis in women, often with thick, purulent discharge.
  • •Untreated cervicitis can ascend to cause Pelvic Inflammatory Disease (PID), leading to infertility.
  • •Fitz-Hugh-Curtis syndrome, a complication of PID, is a perihepatitis causing 'violin-string' adhesions on the liver capsule.
  • •Disseminated Gonococcal Infection (DGI) presents with a classic triad of polyarthralgias, tenosynovitis, and pustular dermatitis.
  • •Most common cause of septic arthritis in sexually active young adults, typically affecting a single large joint like the knee.

🛡️ Risk Factors & Prevention

  • •Deficiency in terminal complement components (C5-C9) increases risk for recurrent and disseminated Neisserial infections.
  • •Causes ophthalmia neonatorum, a severe purulent conjunctivitis in newborns acquired during birth.
  • •All newborns receive prophylactic topical erythromycin ointment to prevent gonococcal ophthalmia neonatorum.

💊 Treatment

  • •Standard treatment is a single dose of intramuscular Ceftriaxone.
  • •Empiric co-treatment for Chlamydia trachomatis with azithromycin or doxycycline is crucial due to high rates of co-infection.

🧠 Mnemonics

DGI Triad: SATSynovitis (or tenosynovitis), Arthralgias, and Tin-of-pustules (dermatitis).
Thayer-Martin Agar: VCNVancomycin (inhibits Gram+), Colistin/Polymyxin (inhibits Gram-), Nystatin (inhibits fungi).
Gonorrhea vs. MeningitidisGonococcus ferments Glucose only. Meningococcus ferments Maltose and Glucose.

🩺 Classic boards tip-off

A 22-year-old sexually active male presents with a swollen, painful right knee, a rash with a few pustules on his hands, and tenosynovitis of his wrist, pointing to a diagnosis of disseminated gonococcal infection.

Lesson Info

Duration
8 minutes
Status
Completed

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