Gonorrhea easy notes pathophysiology, Study notes of Pathophysiology

Subject -pathophysiology Topic- Gonorrhea Year-2025-2026 course- pharm D, B pharm, D pharm, MBBS all medical feild. Author- Rohit Kumar Singh

Typology: Study notes

2025/2026

Available from 05/30/2026

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GONORRHEA
Gonorrhea โ€“ Introduction
Gonorrhea is a common sexually transmitted infection (STI) caused by a
bacterium called
Neisseria gonorrhoeae
. It spreads mainly through unprotected
sexual contact with an infected person, including vaginal, anal, and oral sex. It
can infect the genital tract, rectum, throat, and sometimes the eyes.
This infection affects both males and females, but it is often more common in
young sexually active people, especially those having multiple sexual partners or
not using protection. In many cases, infected people may not show symptoms at
the early stage, which increases the risk of spreading the infection unknowingly.
In men, it usually affects the urethra, while in women it mainly affects the
cervix. It can also spread to other parts of the body if not treated in time. A
pregnant woman can pass the infection to her baby during delivery, which may
cause eye infection in the newborn.
If gonorrhea is not treated properly, it can lead to serious complications such as
pelvic inflammatory disease (PID), infertility in women, epididymitis in men, and
increased risk of other infections. However, gonorrhea can be effectively treated
and cured with appropriate antibiotics if diagnosed early.
Gonorrhea โ€“ Types
1. Urogenital Gonorrhea
Urogenital gonorrhea is the most common type of gonorrhea infection. It affects
the genital and urinary tract of both males and females. In males, the infection
mainly involves the urethra and is called gonococcal urethritis. It causes
symptoms like burning during urination and discharge from the penis. In females,
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GONORRHEA

Gonorrhea โ€“ Introduction

Gonorrhea is a common sexually transmitted infection (STI) caused by a

bacterium called Neisseria gonorrhoeae. It spreads mainly through unprotected

sexual contact with an infected person, including vaginal, anal, and oral sex. It can infect the genital tract, rectum, throat, and sometimes the eyes. This infection affects both males and females, but it is often more common in young sexually active people, especially those having multiple sexual partners or not using protection. In many cases, infected people may not show symptoms at the early stage, which increases the risk of spreading the infection unknowingly. In men, it usually affects the urethra, while in women it mainly affects the cervix. It can also spread to other parts of the body if not treated in time. A pregnant woman can pass the infection to her baby during delivery, which may cause eye infection in the newborn. If gonorrhea is not treated properly, it can lead to serious complications such as pelvic inflammatory disease (PID), infertility in women, epididymitis in men, and increased risk of other infections. However, gonorrhea can be effectively treated and cured with appropriate antibiotics if diagnosed early.

Gonorrhea โ€“ Types

  1. Urogenital Gonorrhea Urogenital gonorrhea is the most common type of gonorrhea infection. It affects the genital and urinary tract of both males and females. In males, the infection mainly involves the urethra and is called gonococcal urethritis. It causes symptoms like burning during urination and discharge from the penis. In females,

it mainly affects the cervix and urethra. Many women may not show symptoms in the early stage, but it can still progress silently and cause complications. This type is mainly spread through unprotected vaginal sexual contact with an infected person.

  1. Rectal Gonorrhea Rectal gonorrhea occurs when the infection affects the lining of the rectum. It usually spreads through anal sexual contact with an infected partner. This type may sometimes be asymptomatic, but when symptoms appear, they include rectal pain, itching, discharge, and discomfort during bowel movements. If not treated, it can lead to inflammation and further spread of infection. It is important to diagnose it early, especially in people with high-risk sexual behavior.
  2. Pharyngeal Gonorrhea

Pharyngeal gonorrhea is an infection of the throat caused by Neisseria

gonorrhoeae. It is mainly transmitted through oral sexual contact. In many cases,

it does not show any symptoms, which makes it difficult to detect. When symptoms occur, they may include sore throat, redness, and difficulty in swallowing. It is less common than genital gonorrhea but still important because it can act as a hidden source of infection and transmission.

  1. Ocular Gonorrhea (Ophthalmia Neonatorum) Ocular gonorrhea refers to infection of the eyes. It is most commonly seen in newborn babies when they pass through the birth canal of an infected mother during delivery. The infection causes severe eye redness, swelling, and discharge, and if not treated immediately, it can lead to blindness. In adults, it is rare but can occur through direct contamination. Preventive care during childbirth is very important to avoid this condition.
  2. Uncomplicated Gonorrhea Uncomplicated gonorrhea refers to infection that is limited to the initial site of

In females:

  • Increased vaginal discharge
  • Burning during urination
  • Lower abdominal pain
  • Irregular bleeding between periods Other sites:
  • Rectal infection: pain, itching, or discharge
  • Throat infection: sore throat (often no symptoms)
  • Eye infection: redness, swelling, discharge Severe cases:
  • Fever and joint pain (spread in body)
  • Pelvic inflammatory disease (PID) in females
  • Infertility if untreated Gonorrhea โ€“ Causes
  • Caused by a bacterium called Neisseria gonorrhoeae
  • Spread mainly through unprotected sexual contact (vaginal, anal, or oral sex)
  • Having multiple sexual partners increases risk
  • Sexual contact with an infected person is the main mode of transmission
  • Mother can transmit infection to baby during childbirth (causing eye infection)
  • Rarely spread through contaminated sexual fluids touching eyes or mucous membranes
  • Does NOT spread through casual contact like hugging, sharing food, or toilet seats

Gonorrhea โ€“ Pathophysiology

  • Gonorrhea is caused by Neisseria gonorrhoeae, a Gram-negative diplococcus bacterium.
  • The bacteria enter the body through sexual contact and attach to the mucosal surfaces of the genital tract, rectum, throat, or eyes.
  • It uses special structures called pili (fimbriae) to stick firmly to epithelial cells and avoid being washed away.
  • After attachment, the bacteria invade the mucosal cells and multiply locally.
  • This causes damage to epithelial cells and triggers a strong inflammatory response.
  • Neutrophils (white blood cells) migrate to the infection site, leading to pus formation and discharge.
  • The infection spreads along mucosal surfaces, especially in the urethra, cervix, and other reproductive organs.
  • In females, it may ascend to the uterus and fallopian tubes, causing pelvic inflammatory disease (PID).
  • In males, it can spread to the epididymis causing epididymitis.
  • If untreated, bacteria may enter the bloodstream and cause disseminated gonococcal infection (DGI) affecting joints and skin.
  • The bacteria can evade immune response by changing surface proteins, which helps it persist and cause reinfection.
  1. Swab and Urine Tests Swab samples are taken from the cervix, urethra, throat, or rectum depending on the site of infection. In men, a first-catch urine sample is commonly used. These samples help in identifying the presence of infection and are often used along with NAAT or culture for accurate diagnosis.
  2. Antibiotic Sensitivity Testing Since gonorrhea bacteria can become resistant to antibiotics, sensitivity testing is very important. This test is done on cultured bacteria to find out which antibiotics are effective. It helps in selecting the correct treatment and prevents treatment failure.
  3. Screening Tests Screening is done in people who are at high risk, such as those with multiple sexual partners, pregnant women, or individuals with other sexually transmitted infections. Early screening helps in detecting asymptomatic cases and prevents complications as well as spread of infection. Gonorrhea โ€“ Treatment
    • Ceftriaxone (drug of choice) o Given as IM injection o Mechanism: inhibits bacterial cell wall synthesis โ†’ kills bacteria
    • Azithromycin (sometimes added) o Oral tablet o Mechanism: inhibits protein synthesis (50S ribosome) โ†’ stops bacterial growth
  • Cefixime (alternative option) o Oral cephalosporin o Mechanism: inhibits bacterial cell wall synthesis โ†’ bactericidal action
  • Doxycycline (if chlamydia co-infection suspected/confirmed) o Oral antibiotic o Mechanism: inhibits protein synthesis (30S ribosome) โ†’ stops growth
  • For severe/disseminated infection o Higher dose Ceftriaxone IV/IM o Same mechanism: cell wall inhibition โ†’ bacterial death Gonorrhea โ€“ Treatment Algorithm Step 1: Suspected case of gonorrhea
  • Symptoms: discharge, burning urination, genital pain โ†’ Collect samples for testing (NAAT / Gram stain) Step 2: Start Empirical Treatment (do not wait for report if high suspicion)
  • Give Ceftriaxone (IM single dose) Step 3: Check for Chlamydia co-infection
  • If suspected or not ruled out โ†’ add o Azithromycin OR Doxycycline (oral) Step 4: Severe / Disseminated infection