Medicine – Gonorrhoea: Aetiology, Transmission, Pathogenesis, Clinical Features, Diagnosis, Complications and Treatment

Medicine – Gonorrhoea: Aetiology, Transmission, Pathogenesis, Clinical Features, Diagnosis, Complications and Treatment

1. Introduction to Gonorrhoea

Gonorrhoea is a common sexually transmitted infection (STI) caused by Neisseria gonorrhoeae, a Gram-negative diplococcus that primarily infects mucosal surfaces of the genitourinary tract, rectum, pharynx and conjunctiva.

It is an important cause of urethritis in men and cervicitis and pelvic inflammatory disease (PID) in women.

The classical presentation in men is purulent urethral discharge accompanied by dysuria, urethral irritation and discomfort.

In women, gonorrhoea frequently produces mild or no symptoms, allowing infection to persist and potentially ascend into the upper genital tract.

Untreated infection may cause epididymitis, pelvic inflammatory disease, infertility, ectopic pregnancy and, occasionally, disseminated gonococcal infection.

An important modern concern is the development of antimicrobial resistance. Gonorrhoea was historically treated with penicillin, tetracyclines and fluoroquinolones, but resistance has made these drugs unsuitable for routine empirical treatment in many regions.

Ceftriaxone, a third-generation cephalosporin, is the principal recommended treatment for uncomplicated gonorrhoea in current major guidelines.

Aetiology and Microbiology

2. Aetiological Agent – Neisseria gonorrhoeae

Gonorrhoea is caused by Neisseria gonorrhoeae, also known as the gonococcus.

It is a Gram-negative, kidney-shaped diplococcus belonging to the genus Neisseria.

The bacteria commonly occur in pairs, with their adjacent surfaces appearing flattened or concave.

This produces the characteristic coffee-bean or kidney-bean appearance on microscopy.

Neisseria gonorrhoeae is a human-adapted pathogen that preferentially infects non-keratinised mucosal epithelium.

Important sites of infection include the urethra, endocervix, rectum, pharynx and conjunctiva.

3. Morphological Characteristics

Neisseria gonorrhoeae is a Gram-negative diplococcus.

On Gram staining, the organisms appear pink or red because they possess a thin peptidoglycan layer and an outer membrane.

In symptomatic male urethritis, the organisms may be seen inside polymorphonuclear neutrophils.

The characteristic microscopic finding is therefore intracellular Gram-negative diplococci within neutrophils.

This finding is highly suggestive of gonorrhoea when observed in a urethral smear from a symptomatic man.

However, Gram staining is less reliable for cervical, rectal and pharyngeal specimens.

4. Important Microbiological Properties

Neisseria gonorrhoeae is oxidase-positive and catalase-positive.

It is a fastidious organism that requires appropriate laboratory conditions for cultivation.

It grows on enriched media, including chocolate agar.

Selective media, such as modified Thayer–Martin medium, may be used to isolate the organism from specimens containing mixed bacterial flora.

A classical laboratory distinction is that N. gonorrhoeae utilises glucose but not maltose.

By comparison, Neisseria meningitidis classically utilises both glucose and maltose.

These biochemical properties are useful traditional microbiology associations, although modern laboratories often use molecular or automated identification methods.

5. Virulence Factors

Neisseria gonorrhoeae possesses several virulence factors that allow it to adhere to mucosal surfaces, evade host immune responses and produce inflammation.

Important virulence factors include type IV pili, opacity-associated proteins, lipooligosaccharide and IgA protease.

These factors contribute to colonisation, epithelial invasion and inflammatory tissue injury.

The organism also demonstrates substantial antigenic variation, particularly involving surface structures.

This helps explain why previous infection does not provide reliable long-term protective immunity.

6. Type IV Pili

Type IV pili are hair-like surface structures that facilitate attachment to epithelial cells.

They help the organism establish infection on mucosal surfaces.

Pili also contribute to bacterial movement and interactions with host cells.

Variation in pilus-associated antigens allows the organism to evade existing immune responses.

This antigenic variation contributes to repeated infection.

7. Opacity-Associated Proteins

Opacity-associated proteins, commonly called Opa proteins, facilitate close interactions between gonococci and host cells.

They contribute to bacterial adherence and invasion.

Variation in Opa protein expression can alter the organism’s interaction with host tissues and immune cells.

This is another mechanism by which N. gonorrhoeae can adapt during infection.

8. Lipooligosaccharide

The outer membrane of Neisseria gonorrhoeae contains lipooligosaccharide (LOS).

LOS has endotoxin-like activity and contributes to the inflammatory response.

It stimulates immune cells and promotes the recruitment of neutrophils.

This inflammatory response is responsible for many clinical manifestations, including purulent urethral discharge.

LOS also contributes to tissue injury during infection.

9. IgA Protease

Neisseria gonorrhoeae produces IgA protease, an enzyme that can cleave certain immunoglobulin A molecules.

IgA is an important component of mucosal immunity.

By interfering with mucosal antibody function, the organism may enhance its ability to colonise epithelial surfaces.

However, gonococcal immune evasion involves multiple mechanisms, not IgA protease alone.

Transmission of Gonorrhoea

10. Sexual Transmission

Gonorrhoea is transmitted predominantly through sexual contact.

Transmission may occur during vaginal, anal or oral intercourse.

The organism spreads through contact with infected genital, rectal or pharyngeal secretions and mucosal surfaces.

Penetrative intercourse is not always necessary for transmission.

An infected individual may transmit gonorrhoea even when no symptoms are present.

This is important because a substantial proportion of infections, particularly cervical and pharyngeal infections, are asymptomatic.

11. Transmission During Vaginal Intercourse

Vaginal intercourse can transmit Neisseria gonorrhoeae between sexual partners.

In men, infection commonly involves the urethra.

In women, the organism preferentially infects the endocervical columnar epithelium.

Infection may also involve the urethra and other genital structures.

Untreated cervical infection can ascend into the uterus and fallopian tubes, causing pelvic inflammatory disease.

12. Transmission During Anal Intercourse

Anal intercourse may transmit gonorrhoea to the rectal mucosa.

Rectal gonorrhoea is frequently asymptomatic.

When symptoms occur, patients may experience rectal discomfort, discharge, bleeding or pain during defecation.

Rectal infection may occur alongside genital or pharyngeal infection.

Testing should therefore consider the anatomical sites of sexual exposure.

13. Transmission During Oral Intercourse

Oral intercourse can transmit gonorrhoea to the pharynx.

Pharyngeal gonorrhoea is commonly asymptomatic.

Some patients experience sore throat or pharyngeal discomfort.

Pharyngeal infection is clinically important because it can contribute to ongoing transmission and may be more difficult to eradicate than uncomplicated urogenital infection.

Appropriate site-specific testing is therefore important.

14. Vertical Transmission

Gonorrhoea can be transmitted from an infected mother to her infant during childbirth.

Exposure to infected genital secretions may result in neonatal conjunctival infection.

This condition is called gonococcal ophthalmia neonatorum.

It can cause severe purulent conjunctivitis and rapid corneal damage.

Without prompt treatment, neonatal gonococcal conjunctivitis may result in corneal perforation and blindness.

15. Incubation Period

The incubation period of symptomatic gonorrhoea is commonly approximately 2–7 days after exposure.

However, symptoms may develop later, and many infections remain asymptomatic.

The incubation period varies according to the site of infection and individual host factors.

Because asymptomatic infection is common, the absence of symptoms does not exclude gonorrhoea.

Pathogenesis of Gonorrhoea

16. Colonisation of Mucosal Epithelium

Following exposure, Neisseria gonorrhoeae attaches to susceptible mucosal epithelial cells.

Type IV pili and other surface proteins facilitate adherence.

The organism can interact with and invade epithelial cells.

It may then spread locally within mucosal tissues.

The resulting infection stimulates an inflammatory response.

17. Neutrophilic Inflammation

Gonococcal infection produces a prominent neutrophilic inflammatory response.

Neutrophils migrate toward the infected mucosal surface.

The accumulation of neutrophils, bacteria and inflammatory debris produces purulent secretions.

This explains the characteristic pus-like urethral discharge associated with gonorrhoea.

Inflammation also contributes to dysuria, local irritation and mucosal tenderness.

18. Ascending Infection

Gonococcal infection may spread beyond the initial mucosal site.

In women, infection can ascend from the cervix into the endometrium and fallopian tubes.

This may produce endometritis, salpingitis and pelvic inflammatory disease.

In men, infection may occasionally extend from the urethra into the epididymis.

Ascending infection is clinically important because it may produce complications that persist after the original infection has been treated.

19. Dissemination Through the Bloodstream

Occasionally, Neisseria gonorrhoeae enters the bloodstream and causes disseminated gonococcal infection.

This may produce skin lesions, tenosynovitis, migratory polyarthralgia or septic arthritis.

Rare complications include endocarditis and meningitis.

Disseminated infection requires prompt systemic antibiotic treatment.

Clinical Features of Gonorrhoea in Men

20. Gonococcal Urethritis

Gonococcal urethritis is a classical manifestation of gonorrhoea in men.

The infection involves inflammation of the urethral mucosa.

Patients commonly develop dysuria and purulent urethral discharge.

The discharge may be thick, yellow, white or greenish.

Symptoms may develop relatively rapidly following exposure.

Gonococcal urethritis is often more symptomatic than chlamydial urethritis, although the clinical features can overlap.

21. Purulent Urethral Discharge

The most characteristic symptom of gonococcal urethritis is a pus-like discharge from the urethra.

The discharge results from the accumulation of neutrophils and inflammatory secretions.

It may be particularly noticeable in the morning or throughout the day.

The presence of prominent purulent discharge strongly suggests gonococcal urethritis.

However, laboratory testing is necessary because other infections may produce similar symptoms.

22. Dysuria

Dysuria refers to pain or burning during urination.

It occurs because the urethral epithelium becomes inflamed.

Patients may describe a sharp burning sensation while passing urine.

Dysuria may occur alongside urethral discharge or as an isolated symptom.

23. Urethral Itching and Irritation

Gonorrhoea may cause itching, tingling or discomfort within the urethra.

Some patients experience irritation at the urethral opening.

The urethral meatus may appear red or inflamed.

These symptoms reflect local mucosal inflammation.

However, urethral itching is not specific to gonorrhoea and may occur with other causes of urethritis.

24. Asymptomatic Gonorrhoea in Men

Some men with gonorrhoea have no noticeable symptoms.

Asymptomatic infection is particularly common at rectal and pharyngeal sites.

Urethral gonorrhoea is more likely to produce symptoms, but asymptomatic urethral infection can occur.

Infected individuals may transmit the organism despite feeling well.

This is an important reason for screening based on sexual exposure and risk rather than symptoms alone.

Complications of Gonorrhoea in Men

25. Epididymitis

Gonorrhoea may cause epididymitis through ascending infection from the urethra.

Patients may develop unilateral scrotal pain, swelling and tenderness.

The epididymis may become enlarged and inflamed.

Fever and urinary symptoms may also occur.

In younger sexually active men, gonorrhoea and chlamydia are important infectious causes of epididymitis.

Acute scrotal pain requires urgent assessment to exclude testicular torsion.

26. Prostatitis

The original notes identify prostatitis as a possible complication of gonorrhoea.

Gonococcal prostatitis has been described, but it is uncommon compared with other causes of bacterial prostatitis.

Patients may develop pelvic or perineal discomfort, urinary symptoms and sometimes fever.

When acute bacterial prostatitis is suspected, clinical assessment and appropriate microbiological testing are important.

27. Urethral Stricture

Historically, untreated gonococcal urethritis was an important cause of urethral strictures.

Persistent inflammation may lead to fibrosis and narrowing of the urethral lumen.

Patients may develop a weak urinary stream, difficulty initiating urination or incomplete bladder emptying.

However, urethral strictures caused by gonorrhoea are less common in settings where infection is diagnosed and treated promptly.

The association remains important in traditional medical examinations.

28. Fertility Complications in Men

Severe or recurrent infection involving the epididymis may occasionally affect male fertility.

Inflammation can damage structures involved in sperm transport.

However, infertility is a less common consequence of gonorrhoea in men than tubal infertility following pelvic inflammatory disease in women.

Early treatment reduces the risk of complications.

Clinical Features of Gonorrhoea in Women

29. Gonococcal Cervicitis

In women, gonorrhoea commonly infects the endocervix.

This may produce cervicitis, which is inflammation of the cervical mucosa.

Patients may develop mucopurulent cervical discharge, abnormal vaginal discharge or bleeding after sexual intercourse.

The cervix may appear erythematous or friable during examination.

However, many women with cervical gonorrhoea have minimal symptoms or remain asymptomatic.

30. Vaginal Discharge

Gonococcal cervicitis may produce increased vaginal discharge.

The discharge may be yellowish or mucopurulent.

However, its appearance is variable and not specific to gonorrhoea.

Other infections, including chlamydia and trichomoniasis, may produce similar symptoms.

Therefore, vaginal discharge alone cannot reliably distinguish these conditions.

31. Intermenstrual and Postcoital Bleeding

Inflammation of the cervical mucosa may make the cervix more fragile.

This can produce bleeding between menstrual periods or after sexual intercourse.

Contact bleeding may also occur during cervical examination.

These findings are compatible with cervicitis but are not specific to gonococcal infection.

32. Dysuria

Gonorrhoea may infect the female urethra.

This can produce urethritis with dysuria and urinary irritation.

Some patients may be mistaken for having a conventional urinary tract infection.

Sexual history and appropriate STI testing are therefore important when evaluating compatible symptoms.

33. Asymptomatic Gonorrhoea in Women

A substantial proportion of women with gonorrhoea are asymptomatic.

Infection may persist within the cervix without producing obvious discharge or discomfort.

Despite the absence of symptoms, the organism may ascend into the upper genital tract.

This can cause pelvic inflammatory disease and reproductive complications.

Therefore, asymptomatic gonorrhoea can still result in clinically significant harm.

Pelvic Inflammatory Disease

34. Gonorrhoea as a Cause of PID

Neisseria gonorrhoeae is an important cause of pelvic inflammatory disease.

PID occurs when infection and inflammation involve the upper female genital tract.

It may include endometritis, salpingitis, tubo-ovarian abscess and pelvic peritonitis.

Although gonorrhoea can initiate PID, the infection is frequently polymicrobial.

Other organisms, including Chlamydia trachomatis and vaginal anaerobes, may contribute.

35. Clinical Features of PID

Patients with PID may develop lower abdominal pain, pelvic tenderness, fever and abnormal vaginal discharge.

Dyspareunia, intermenstrual bleeding and postcoital bleeding may also occur.

Pelvic examination may reveal cervical motion tenderness, uterine tenderness or adnexal tenderness.

However, symptoms may be mild or non-specific.

PID may occasionally occur without prominent fever or obvious genital discharge.

36. Salpingitis

Salpingitis refers to inflammation of the fallopian tubes.

It can develop when gonococcal infection ascends from the cervix.

Inflammation may damage the tubal epithelium and impair normal ciliary function.

Severe or recurrent inflammation can cause scarring and adhesions.

This may interfere with the normal transport of the ovum.

37. Tubal Infertility

Gonococcal PID can cause infertility through damage to the fallopian tubes.

Inflammation may produce fibrosis, adhesions and tubal obstruction.

When the tubes become damaged, fertilisation may be impaired.

The risk of infertility increases with repeated episodes of PID.

Antibiotics can treat the infection but may not reverse established structural damage.

38. Ectopic Pregnancy

Fallopian tube damage following PID increases the risk of ectopic pregnancy.

Scarring and impaired ciliary function may prevent normal transport of the fertilised ovum.

This increases the likelihood of implantation within the fallopian tube.

A ruptured ectopic pregnancy can produce severe intra-abdominal haemorrhage and is a medical emergency.

39. Chronic Pelvic Pain

Gonorrhoea-associated PID may result in chronic pelvic pain.

Persistent pain can occur because of pelvic adhesions and structural damage.

Symptoms may continue after the infection has been eradicated.

This highlights the importance of early diagnosis and treatment.

40. Fitz-Hugh–Curtis Syndrome

Fitz-Hugh–Curtis syndrome is perihepatitis associated with pelvic inflammatory disease.

It involves inflammation of the liver capsule.

Patients may experience right upper quadrant abdominal pain.

Laparoscopy may demonstrate characteristic violin-string adhesions between the liver capsule and surrounding structures.

Both gonorrhoea and chlamydia may be associated with this syndrome.

Extragenital Gonorrhoea

41. Rectal Gonorrhoea

Rectal gonorrhoea may occur following exposure of the rectal mucosa.

Many infections are asymptomatic.

When symptoms occur, they may include rectal pain, discharge, bleeding, tenesmus or discomfort during defecation.

Rectal infection can coexist with genital or pharyngeal gonorrhoea.

Diagnosis is usually established using an appropriately validated rectal NAAT.

42. Pharyngeal Gonorrhoea

Pharyngeal gonorrhoea occurs following exposure of the oropharyngeal mucosa.

Most patients are asymptomatic.

Some develop sore throat or pharyngeal irritation.

Pharyngeal infection is important because it may contribute to ongoing transmission and is more difficult to eradicate reliably than urogenital infection.

A test of cure is commonly recommended after treatment of pharyngeal gonorrhoea.

43. Gonococcal Conjunctivitis in Adults

Gonococcal conjunctivitis can occur when infected secretions contact the eye.

It may produce marked conjunctival redness, eyelid swelling and copious purulent discharge.

The infection can progress rapidly and cause corneal ulceration.

Without prompt treatment, corneal perforation and visual loss may occur.

Suspected gonococcal conjunctivitis requires urgent medical and ophthalmological assessment.

Neonatal Gonorrhoea

44. Gonococcal Ophthalmia Neonatorum

Gonococcal ophthalmia neonatorum is a severe neonatal conjunctival infection caused by Neisseria gonorrhoeae.

It usually develops approximately 2–5 days after birth.

The infant may develop pronounced eyelid swelling, conjunctival inflammation and copious purulent discharge.

The infection can rapidly involve the cornea.

Without treatment, corneal ulceration, perforation and blindness may occur.

This condition requires urgent systemic antibiotic treatment.

45. Prevention of Neonatal Gonorrhoea

Prevention involves identifying and treating maternal gonococcal infection during pregnancy.

Neonatal ocular prophylaxis is used in some healthcare systems according to national recommendations.

However, prophylaxis does not replace maternal screening and treatment.

Infants with suspected gonococcal conjunctivitis require prompt evaluation and systemic therapy.

Disseminated Gonococcal Infection

46. Introduction to Disseminated Gonococcal Infection

Disseminated gonococcal infection (DGI) occurs when Neisseria gonorrhoeae spreads through the bloodstream.

It is an uncommon but important complication of gonorrhoea.

DGI may occur even when the original genital infection produces few or no symptoms.

The infection can involve joints, tendon sheaths and skin.

Two major presentations are the arthritis-dermatitis syndrome and purulent gonococcal arthritis.

47. Arthritis-Dermatitis Syndrome

The classical arthritis-dermatitis syndrome is characterised by a combination of migratory polyarthralgia, tenosynovitis and skin lesions.

Patients may experience pain affecting several joints.

Tenosynovitis commonly involves tendons of the hands, wrists, ankles or feet.

Skin lesions may be sparse and can appear as pustules or vesiculopustular lesions, sometimes with haemorrhagic features.

The complete triad is not present in every patient.

48. Gonococcal Septic Arthritis

Gonorrhoea may cause septic arthritis through haematogenous dissemination.

Patients may develop acute pain, swelling and reduced movement in an affected joint.

The knee, wrist and ankle are among the commonly involved joints.

Joint aspiration and appropriate microbiological testing are important when septic arthritis is suspected.

This condition requires urgent antibiotic treatment and may require joint drainage.

49. Rare Disseminated Complications

Rare manifestations of disseminated gonococcal infection include endocarditis and meningitis.

These complications can be severe and potentially life-threatening.

They require hospital-based investigation and prolonged antimicrobial treatment.

Diagnosis of Gonorrhoea

50. Clinical Diagnosis

Gonorrhoea should be suspected in sexually active patients presenting with purulent urethral discharge, dysuria, cervicitis or compatible rectal and pharyngeal symptoms.

A history of recent sexual exposure may support the diagnosis.

However, clinical features alone cannot reliably distinguish gonorrhoea from other sexually transmitted infections.

Many patients are asymptomatic, particularly those with cervical, rectal or pharyngeal infection.

Laboratory confirmation is therefore important.

51. Gram Staining

Gram staining is a traditional diagnostic method for gonorrhoea.

A urethral swab is collected and examined microscopically.

The characteristic finding is intracellular Gram-negative diplococci within polymorphonuclear neutrophils.

In symptomatic men with urethral discharge, this finding has high diagnostic specificity.

However, Gram staining is less sensitive and specific for cervical, rectal and pharyngeal specimens.

A negative Gram stain does not exclude gonorrhoea.

52. Nucleic Acid Amplification Testing

Nucleic acid amplification testing (NAAT) is the preferred routine diagnostic method for gonorrhoea in many clinical settings.

NAAT detects genetic material from Neisseria gonorrhoeae.

It provides high sensitivity and specificity when used with validated specimens.

Depending on the anatomical site, samples may include first-catch urine, vaginal swabs, cervical swabs, rectal swabs and pharyngeal swabs.

NAAT can also detect infection in asymptomatic individuals.

However, NAAT does not routinely provide antimicrobial susceptibility information.

53. Specimen Collection

In men, first-catch urine is commonly used for detecting urethral gonorrhoea.

A urethral swab may be obtained when discharge is present, particularly if microscopy or culture is required.

In women, vaginal swabs are generally suitable for NAAT.

Rectal and pharyngeal swabs should be collected when indicated by exposure history or screening recommendations.

Sampling the correct anatomical sites is important because genital testing alone may miss extragenital infection.

54. Gonococcal Culture

Culture remains important in gonorrhoea diagnosis because it allows the organism to be isolated and tested for antibiotic susceptibility.

Specimens may be inoculated onto selective media, including modified Thayer–Martin medium.

The organism requires suitable transport and laboratory conditions because it is relatively fragile outside the host.

Culture is particularly important when antimicrobial resistance or treatment failure is suspected.

Although NAAT is more convenient for routine diagnosis, culture is essential for assessing antimicrobial susceptibility.

55. Antibiotic Susceptibility Testing

Antimicrobial susceptibility testing determines whether an isolated gonococcal strain is susceptible or resistant to particular antibiotics.

This is increasingly important because Neisseria gonorrhoeae has developed resistance to multiple antimicrobial classes.

Testing may assess susceptibility to ceftriaxone, ciprofloxacin and other agents.

Results can guide treatment when standard therapy is unsuitable or treatment failure is suspected.

Surveillance of antimicrobial resistance is also essential for maintaining effective national treatment guidelines.

Treatment of Gonorrhoea

56. Principles of Treatment

Treatment aims to eradicate Neisseria gonorrhoeae, relieve symptoms, prevent complications and reduce transmission.

Antibiotic selection must account for local antimicrobial resistance patterns.

This is especially important because gonorrhoea has developed resistance to several drugs that were previously effective.

The preferred treatment for uncomplicated gonorrhoea is generally ceftriaxone.

Patients should also be assessed for associated sexually transmitted infections, particularly chlamydia.

57. Ceftriaxone

Ceftriaxone is a third-generation cephalosporin antibiotic.

It inhibits bacterial cell wall synthesis by binding to penicillin-binding proteins.

This interferes with peptidoglycan cross-linking and compromises bacterial cell wall integrity.

Ceftriaxone has bactericidal activity against susceptible Neisseria gonorrhoeae.

It is the principal recommended treatment for uncomplicated gonorrhoea in current UK and US guidelines.

However, reduced susceptibility and ceftriaxone-resistant gonococcal strains have been reported, making continued resistance surveillance essential.

58. Recommended Treatment in the United Kingdom

The 2025 British Association for Sexual Health and HIV (BASHH) guideline recommends:

Ceftriaxone 1 g intramuscularly as a single dose for uncomplicated anogenital and pharyngeal gonorrhoea in adults.

Alternative regimens may be considered in selected circumstances, particularly when ceftriaxone cannot be administered.

The choice of an alternative should account for antimicrobial susceptibility, allergy history and specialist guidance. BASHH +1

59. Recommended Treatment in the United States

The CDC guideline recommends:

Ceftriaxone 500 mg intramuscularly as a single dose for uncomplicated gonorrhoea in patients weighing less than 150 kg.

For patients weighing 150 kg or more, the recommended dose is 1 g intramuscularly.

If chlamydial infection has not been excluded, doxycycline 100 mg orally twice daily for seven days is also recommended in appropriate non-pregnant patients.

These differences demonstrate why treatment should follow the relevant national guideline. STI Treatment Guidelines

60. Penicillin

Penicillin was historically used to treat gonorrhoea.

It inhibits bacterial cell wall synthesis by interfering with peptidoglycan cross-linking.

However, Neisseria gonorrhoeae has developed substantial resistance to penicillin through several mechanisms.

These include beta-lactamase production and alterations in penicillin-binding proteins.

Consequently, penicillin is not recommended for routine empirical treatment of gonorrhoea.

This is an important correction to older medical textbooks.

61. Ciprofloxacin

Ciprofloxacin is a fluoroquinolone antibiotic.

It inhibits bacterial DNA gyrase and topoisomerase IV, disrupting bacterial DNA replication.

Ciprofloxacin was previously widely used to treat gonorrhoea.

However, widespread fluoroquinolone resistance has limited its usefulness.

It should not be used routinely as empirical treatment.

In selected cases, ciprofloxacin may be considered when susceptibility is confirmed and its use is clinically appropriate. Sage Journals

62. Tetracyclines

Tetracyclines inhibit bacterial protein synthesis by binding to the 30S ribosomal subunit.

Historically, tetracyclines were used for gonococcal infection.

However, resistance has made them unreliable for treating gonorrhoea.

Doxycycline remains important for treating associated Chlamydia trachomatis infection.

Doxycycline alone is not an appropriate treatment for gonorrhoea.

63. Antimicrobial Resistance

Antimicrobial resistance is one of the most important modern concerns in gonorrhoea management.

Neisseria gonorrhoeae has developed resistance to several antibiotic classes, including penicillins, tetracyclines, fluoroquinolones and macrolides.

Reduced susceptibility and resistance to extended-spectrum cephalosporins have also emerged.

Resistance may arise through chromosomal mutations, altered drug targets, efflux mechanisms and other bacterial adaptations.

The development of resistant strains makes microbiological surveillance and appropriate antibiotic selection essential.

64. Treatment of Gonorrhoea During Pregnancy

Gonorrhoea during pregnancy requires treatment because untreated infection may contribute to maternal complications and neonatal transmission.

Ceftriaxone is commonly recommended.

Treatment should follow appropriate national guidance.

If chlamydial coinfection is present, an antibiotic suitable for pregnancy must also be selected.

Pregnant patients may require additional follow-up to confirm successful treatment.

65. Treatment of Gonococcal PID

Gonococcal PID requires broader antimicrobial coverage than uncomplicated gonorrhoea.

This is because PID may involve Neisseria gonorrhoeae, Chlamydia trachomatis and anaerobic organisms.

A commonly recommended outpatient approach includes ceftriaxone, doxycycline and metronidazole, with exact doses and duration determined by the applicable PID guideline.

Ceftriaxone provides gonococcal coverage.

Doxycycline treats chlamydia and other susceptible organisms.

Metronidazole provides anaerobic coverage.

Severe PID may require hospitalisation and intravenous antibiotics.

66. Treatment of Disseminated Gonococcal Infection

Disseminated gonococcal infection requires systemic antibiotic treatment.

Ceftriaxone is commonly used intravenously or intramuscularly.

For gonococcal arthritis and arthritis-dermatitis syndrome, the UK guideline recommends ceftriaxone 1 g every 24 hours initially, with subsequent treatment determined by clinical response and susceptibility.

Complications such as endocarditis or meningitis require longer treatment courses and specialist management. Sage Journals

Follow-Up and Prevention

67. Test of Cure

A test of cure is performed to determine whether gonorrhoea has been successfully eradicated.

The need for testing depends on the anatomical site, treatment regimen, antimicrobial susceptibility and applicable guidelines.

Under the 2025 UK guideline, a test of cure is recommended in several situations, including pharyngeal infection, persistent symptoms, unknown antimicrobial susceptibility, pregnancy and use of treatment other than ceftriaxone.

Routine test of cure may not be necessary for susceptible anogenital infection treated with the recommended ceftriaxone regimen.

Testing should be performed at an appropriate interval to avoid misleading results from residual bacterial nucleic acid. BASHH

68. Reinfection

Gonorrhoea can occur repeatedly.

Previous infection does not provide reliable long-term protective immunity.

This is partly related to antigenic variation in gonococcal surface structures.

Reinfection commonly occurs when sexual partners remain untreated or when a patient has a new exposure.

Retesting approximately three months after treatment is commonly recommended because reinfection is frequent.

69. Treatment of Sexual Partners

Sexual partner management is essential for controlling gonorrhoea.

Recent sexual partners should be assessed, tested and treated according to relevant guidelines.

Patients should avoid sexual contact until treatment has been completed and the recommended abstinence period has passed.

The UK guideline advises abstaining until seven days after both the patient and their partner or partners have completed treatment.

Appropriate partner management reduces reinfection and ongoing transmission. BASHH

70. Screening for Other Sexually Transmitted Infections

Patients diagnosed with gonorrhoea should be assessed for other sexually transmitted infections.

Testing commonly includes chlamydia, syphilis and HIV.

This is important because coinfection may occur.

Identifying additional infections allows appropriate treatment and reduces the risk of complications.

71. Safer Sexual Practices

Consistent and correct condom use reduces the risk of gonorrhoea transmission.

However, no barrier method eliminates all STI transmission risk.

Regular STI screening may be appropriate for individuals with ongoing exposure risk.

Early diagnosis, effective treatment and partner notification are important preventive measures.

Gonorrhoea and Chlamydia – Important Distinction

72. Gonococcal Urethritis

Gonococcal urethritis is caused by Neisseria gonorrhoeae.

It classically produces prominent purulent urethral discharge and dysuria.

The organism is a Gram-negative diplococcus.

Microscopy may demonstrate intracellular Gram-negative diplococci within neutrophils.

Treatment generally involves ceftriaxone.

73. Chlamydial Urethritis

Chlamydial urethritis is caused by Chlamydia trachomatis.

It often produces milder symptoms and scanty mucoid or mucopurulent discharge.

Many infections are asymptomatic.

The organism is an obligate intracellular bacterium.

Diagnosis is usually established using NAAT.

Treatment generally involves doxycycline in non-pregnant adults.

74. Coinfection

Gonorrhoea and chlamydia can occur simultaneously.

Both organisms can cause urethritis, cervicitis and pelvic inflammatory disease.

Because clinical features overlap, patients with suspected gonorrhoea are commonly tested for chlamydia.

When chlamydial infection has not been excluded, additional treatment may be required according to the relevant guideline.

Important Corrections to the Original Notes

75. Large Asymptomatic Population

The original statement that many patients with gonorrhoea are asymptomatic is correct.

However, the frequency of asymptomatic infection depends on the anatomical site.

Urethral gonorrhoea in men is frequently symptomatic.

Cervical, rectal and pharyngeal infections are more commonly asymptomatic.

76. Diagnosis by Urethral Swab

The original notes correctly identify Gram-negative diplococci as a characteristic microscopic finding.

However, NAAT is now the preferred routine diagnostic method in many settings.

Gram staining remains particularly useful for symptomatic male urethritis.

Culture is important when antimicrobial susceptibility testing is required.

77. Antibiotic Sensitivity in the United Kingdom

The original notes state that gonorrhoea in the UK is predominantly sensitive to penicillin, ciprofloxacin, cephalosporins and tetracycline.

This is outdated and should not be used to guide current treatment.

Resistance to penicillins, tetracyclines and fluoroquinolones is widespread.

The current UK first-line recommendation is ceftriaxone 1 g intramuscularly as a single dose.

Ciprofloxacin may be considered in selected circumstances when susceptibility is confirmed, but it is not recommended as routine first-line treatment. BASHH +1

78. Complications of Untreated Gonorrhoea

The original notes correctly identify PID, epididymitis, prostatitis and urethral strictures as possible complications.

However, prostatitis and urethral strictures are relatively uncommon complications in modern clinical practice.

Other important complications include tubal infertility, ectopic pregnancy, disseminated gonococcal infection and neonatal ophthalmia.

Important Clinical Associations – Note Form

79. Neisseria gonorrhoeae

Neisseria gonorrhoeae is a Gram-negative diplococcus.

It is oxidase-positive and classically utilises glucose but not maltose.

It infects mucosal surfaces of the urethra, cervix, rectum, pharynx and conjunctiva.

80. Gram Staining

The characteristic finding is intracellular Gram-negative diplococci within neutrophils.

This is particularly useful in symptomatic male urethritis.

81. Gonococcal Urethritis

Gonococcal urethritis classically causes purulent urethral discharge and dysuria.

Symptoms often develop within several days of exposure.

82. Gonococcal Cervicitis

Gonococcal cervicitis may produce mucopurulent cervical discharge, cervical friability and abnormal bleeding.

Many patients remain asymptomatic.

83. Pelvic Inflammatory Disease

Ascending gonococcal infection can cause PID.

Complications include salpingitis, infertility, ectopic pregnancy and chronic pelvic pain.

84. Epididymitis

Gonorrhoea may cause epididymitis through ascending infection.

Patients may develop unilateral scrotal pain and swelling.

85. Disseminated Gonococcal Infection

Disseminated infection classically produces migratory polyarthralgia, tenosynovitis and pustular skin lesions.

It may also cause septic arthritis.

86. Gonococcal Ophthalmia Neonatorum

Neonatal gonococcal conjunctivitis typically develops 2–5 days after birth.

It produces severe purulent conjunctivitis and may rapidly cause corneal damage.

87. NAAT

NAAT is the preferred routine diagnostic test for gonorrhoea in many settings.

It can detect infection in urine and appropriate genital or extragenital swabs.

88. Culture and Sensitivity

Gonococcal culture allows antimicrobial susceptibility testing.

It is particularly important when antibiotic resistance or treatment failure is suspected.

89. Ceftriaxone

Ceftriaxone is a third-generation cephalosporin.

It inhibits bacterial cell wall synthesis.

It is the principal recommended antibiotic for uncomplicated gonorrhoea.

90. Antimicrobial Resistance

Gonorrhoea has developed resistance to multiple antimicrobial classes.

Penicillin, tetracycline and ciprofloxacin should not be assumed effective.

Antibiotic treatment should follow current national guidelines and susceptibility results where appropriate.

Key Clinical Pattern

The defining feature of gonorrhoea is mucosal infection caused by the Gram-negative diplococcus Neisseria gonorrhoeae, classically producing purulent urethral discharge and dysuria, with potential complications involving the reproductive tract and disseminated infection.

Neisseria gonorrhoeae → Gram-negative, oxidase-positive diplococcus.

Microscopy → Intracellular Gram-negative diplococci within neutrophils.

Transmission → Vaginal, anal and oral sexual contact.

Men → Purulent urethral discharge, dysuria and urethral irritation.

Women → Cervicitis, often asymptomatic.

Ascending infection → Pelvic inflammatory disease and salpingitis.

PID complications → Tubal infertility, ectopic pregnancy and chronic pelvic pain.

Male complications → Epididymitis; less commonly prostatitis or urethral stricture.

Disseminated gonorrhoea → Tenosynovitis, migratory polyarthralgia and pustular skin lesions.

Neonatal gonorrhoea → Severe purulent conjunctivitis developing approximately 2–5 days after birth.

NAAT → Preferred routine diagnostic test.

Culture → Important for antimicrobial susceptibility testing.

Ceftriaxone → First-line antibiotic for uncomplicated gonorrhoea.

Penicillin, tetracycline and ciprofloxacin → Historical treatments limited by antimicrobial resistance.

Partner management → Essential for preventing reinfection and transmission.

For examinations, remember the classical association: Neisseria gonorrhoeae is a Gram-negative diplococcus that causes purulent urethritis in men, cervicitis and PID in women, and neonatal ophthalmia. Intracellular Gram-negative diplococci are characteristic on urethral microscopy, while ceftriaxone is the principal modern treatment.