Genital Tract Infections (GTIs)

Introduction & Broad Overview

Genital Tract Infections (GTIs) encompass a wide variety of diseases affecting the reproductive organs of both males and females. Because the reproductive tract is deeply connected to the urinary system (especially in males) and the abdominal cavity (in females via the fallopian tubes), these infections can range from mild local irritations to life-threatening systemic diseases.

Public Health Context: GTIs are heavily tested in exams because of their massive global burden. If poorly managed, they lead to devastating consequences such as irreversible infertility, chronic pelvic pain, ectopic pregnancies, and a severely increased risk of transmitting/acquiring HIV (due to open genital ulcers and mucosal inflammation).

The Three Main Sources of Genital Infections (Aetiology)

To diagnose and treat a GTI, you must first know where it came from. Infections generally fall into three specific categories:

Category	Where They Come From	How They Spread (Pathogenesis)	Common Clinical Examples
1. Endogenous Infections	Organisms that are normally found in the vagina (Normal Flora/Microbiome).	Usually not spread from person to person. They occur when the normal environment (pH or bacterial balance) is disrupted, allowing naturally occurring microbes to overgrow. (Exam tip: Broad-spectrum antibiotic use kills the "good" Lactobacilli, causing the vaginal pH to rise. This creates a perfect environment for dormant yeast or bad bacteria to suddenly multiply and attack).	Yeast infections (Candidiasis), Bacterial Vaginosis (BV).
2. Sexually Transmitted Infections (STIs)	Acquired from an infected sexual partner.	Direct sexual contact (vaginal, anal, or oral) with infected mucosal surfaces or fluids. (Note: Many individuals act as "asymptomatic carriers," meaning they spread the disease without ever showing visible signs).	Gonorrhoea, Chlamydia, Syphilis, Chancroid, Trichomoniasis, Genital Herpes (HSV), Genital Warts (HPV), HIV.
3. Iatrogenic Infections	Introduced from outside the body, or normal flora pushed into sterile areas by a medical procedure.	Occurs during medical interventions. Examples: Pushing vaginal bacteria into the sterile uterus during IUD insertion, childbirth, abortions, or using unsterile/contaminated instruments (like uterine sounds or speculums). Poor infection control in the clinic is the primary culprit.	Pelvic Inflammatory Disease (PID) following a procedure, postpartum sepsis, post-abortion infections.

General Pathogenesis: How Do Pathogens Invade?

Pathogens have different strategies for attacking the host. In an exam, you may be asked to classify an organism by its mode of spread:

Local Invasion: The pathogen attacks the exact spot it touches, invading the skin and mucous membranes to cause local sores or ulcers.
- Examples: Treponema pallidum (causes chancre), Haemophilus ducreyi (causes chancroid), Herpes Simplex Virus (causes vesicles).
- Scenario: A patient notices a painful, fluid-filled blister on their genitalia a few days after unprotected sex. The virus hasn't gone to the brain or heart; it is locally destroying the skin cells.
Systemic Dissemination (Bloodstream): The pathogen enters locally but uses the bloodstream to travel to distant organs.
- Examples: Treponema pallidum (Secondary and Tertiary Syphilis), HIV.
- Scenario: Months after an initial painless genital ulcer healed, a patient suddenly develops a full-body rash, including on the palms of their hands and soles of their feet. The bacteria (Treponema) have used the blood to travel everywhere.
Ascending Infection: The pathogen enters at the bottom (urethra or cervix) and physically climbs up the mucosal lining into the sterile upper tract (uterus, tubes).
- Examples: Neisseria gonorrhoeae, Chlamydia trachomatis.
- Mechanism: Bacteria use physical structures like "pili" (grappling hooks) to pull themselves up the mucosal walls against the downward flow of gravity and mucus.
Vertical Transmission (Maternal-Fetal): Infants born through an infected vaginal canal can swallow or get pathogens in their eyes.
- Examples: Neonatal conjunctivitis from Gonorrhea or Chlamydia.
- Clinical Decision: If a mother has an active Genital Herpes (HSV) outbreak with visible blisters during labor, a Cesarean section (C-section) is heavily indicated to prevent the baby from catching a fatal brain infection (HSV encephalitis) on the way out.

Anatomy of GTIs: Lower vs. Upper Tract

A. Lower Reproductive Tract Infections

These affect the vulva, vagina, and cervix. If left untreated, they act as the gateway to the upper tract.

1. Vaginitis (Vulvo-vaginitis)

This is inflammation of the vagina, often presenting with painful irritation, itching, and abnormal discharge. It is commonly facilitated by disruptive events like abortions, IUD insertions, or menstrual regulation.

🔥 HIGH YIELD EXAM COMPARISON

The Causes of Vaginitis

Memorize this table. You will almost certainly be tested on how to differentiate these three under a microscope, via pH, and via clinical symptoms.

Condition	Clinical Signs (Discharge)	Microscopy / Lab Tests	Vaginal pH (Normal is 3.0 - 4.5)
Candida (Yeast) Endogenous	Abnormal, thick, white curd-like (cottage cheese) discharge. Extreme itching (pruritus).	Fungi (hyphae/spores) visible on a wet prep slide treated with 10% Potassium Hydroxide (KOH). (KOH dissolves the human cells but leaves the tough fungal walls intact for easy viewing).	pH is normal (< 4.5)
Bacterial Vaginosis (BV) Endogenous	Thin, grayish, homogeneous discharge.	The Amsel Criteria (Need 3 of 4 for diagnosis): 1. Homogeneous discharge. 2. "Clue cells" on microscopy (>20%). (These are vaginal epithelial cells completely coated in tiny bacteria, making them look like a fried egg covered in black pepper). 3. pH > 4.5. 4. Positive "Whiff Test": A sharp "fishy" amine odor is produced when 10% KOH is added to the secretions.	pH is elevated (> 4.5)
Trichomonas Infection STI (Protozoa)	Frothy, greenish-yellow, purulent discharge. Often accompanied by a "Strawberry Cervix" (tiny red hemorrhages on the cervix).	Motile, bi-flagellated trichomonads darting around on a wet mount microscopy.	pH is elevated (> 4.5)

2. Cervical Infections (Cervicitis)

The cervix is the neck of the uterus. Infections here are most classically caused by the two major ascending STIs: Chlamydia and Gonorrhea. Cervicitis is often completely asymptomatic in women, making it a highly dangerous silent carrier of disease that can be unknowingly passed to partners or ascending to the uterus.

B. Upper Reproductive Tract Infections

These affect the normally sterile environments of the Uterus, Fallopian tubes, and Ovaries.

Pathogenesis: Usually occurs as a direct complication of untreated lower tract STIs (Gonorrhea and Chlamydia ascending past the cervix).
Pelvic Inflammatory Disease (PID): A severe, painful inflammation of the upper pelvic organs. Patients present with "cervical motion tenderness" (extreme pain when the doctor moves the cervix during a pelvic exam, sometimes called the "Chandelier Sign" because the pain makes them jump up to the ceiling).
Severe Complications: The inflammation heals with heavy scar tissue. Scarring inside the tiny fallopian tubes destroys the microscopic cilia that sweep the egg along. This prevents eggs from traveling normally. This leads to Ectopic Pregnancy (the fertilized egg gets stuck in the scarred tube and grows there, which will eventually rupture the tube causing massive internal bleeding—a surgical emergency) and permanent Infertility.

Deep Dive into Specific Pathogens

1. Jock Itch / Tinea Cruris (Fungal)

Aetiology: An opportunistic fungal infection. The most common cause is Trichophyton rubrum. Other causes include Candida albicans, Trichophyton mentagrophytes, and Epidermophyton floccosum.
Pathogenesis & Risk Factors: Typically occurs in immunocompromised individuals or those with heavy moisture in the groin. Predisposing factors include athletic sports (sweat), improper drying of the groin area, sharing sanitary towels, and already having an athlete's foot infection (which physically transfers to the groin when pulling on underwear over infected feet).
Clinical Presentation: More frequent in men than women. Begins in the groin, thigh skin, or anus as an area with sharply defined, dark-patched borders that may blister. Intense itching is common.
Specimen Collection:
1. Cleanse the infected area with 70% ethanol v/v.
2. Place a clean, dark piece of paper under the area.
3. Collect skin flakes by scraping the surface of the margin of the lesion (where the fungus is actively growing outwards) using a blunt, sterile scalpel.
4. Fold the paper, enclose the sample, label, and send to the lab.
Laboratory Examination:
- Microscopic: Place sample in a drop of 20% KOH V/W, cover with a coverslip. You will see septate hyphae, conidiophores, and microconidia.
- Macroscopic (Culture): Texture is waxy or cottony. The front view is white to brightish yellow. The reverse view (under the petri dish) is pale, yellowish, or brown.
Treatment: Antifungals such as Ketoconazole, Clotrimazole, or Terbinafine.

2. Trichomoniasis

Aetiology: Caused by the flagellated protozoan parasite Trichomonas vaginalis. (Size: approximately 26 μm, has four anterior flagella and a single nucleus, plus a dark median rod called an axostyle).
Pathogenesis:
- Transmitted exclusively via sexual contact (STI).
- Adherence: Attaches to host epithelial cells using an enzyme called cysteine protease and other contact-independent factors.
- Damage: Causes Beta-hemolysis (literally breaks down host red blood cells to steal nutrients like iron).
- Survival: It acquires host macromolecules (e.g., glycoproteins) to disguise itself from the immune system, which is associated with host cell detachment and severe tissue damage.
Clinical Presentation:
- Females: Severe vaginitis. Presents with a green, foamy/purulent discharge with a strong fishy smell. Classic "Strawberry Cervix" (colpitis macularis) seen on speculum exam. Vaginal pH is elevated to ~5.
- Males: Usually asymptomatic carriers, though they may experience mild discomfort during urination.
Complications:
- Neonatal: If expectant mothers are untreated, it causes low birth weight and premature birth.
- Maternal: Postpartum endometritis, premature rupture of membranes (PROM), and a severely increased risk of facilitating HIV transmission (due to mucosal damage and open sores).
Specimen Collection & Processing:
- Swabs collected by a medical officer/nurse. Must be transported immediately in Amies transport medium in a cool box.
- Inoculate and incubate within 30 minutes (the parasite dies quickly outside the body and stops twitching, making it invisible on a slide).
- Direct Wet Mount: Swab smeared on a slide with a drop of physiological saline. Look for motile trophozoites darting around. (Exam note: This is fast but has low sensitivity, only 38-82%).
- Gold Standard: Broth Culture. Easy to interpret but takes 48-72 hours of incubation.
- Rapid/Immune Tests: ELISA, Agglutination, Complement Fixation, Fluorescent Antibody (Fl.ab).

👨‍⚕️ Clinical Scenario: A 24-year-old pregnant female complains of severe vaginal itching and a greenish, frothy discharge. A wet mount with saline reveals pear-shaped, twitching organisms.
Diagnosis: Trichomonas vaginalis. She must be treated immediately (e.g., with Metronidazole) to prevent premature delivery, and her partner MUST also be treated simultaneously ("partner therapy"), even if he has no symptoms, to prevent passing it right back to her ("ping-pong infection").

3. Gonorrhea (The "Clap")

Aetiology: Caused by the bacterium Neisseria gonorrhoeae. It is a Gram-negative diplococcus (looks under the microscope like two red coffee beans stuck together face-to-face).
Pathogenesis:
- Colonization: Primarily colonizes the male urethra and female cervix.
- Attachment: Uses hair-like structures called pili to firmly attach to epithelial cells so the high pressure of urine doesn't wash them away.
- Evasion: Undergoes rapid antigenic variation (it constantly changes its surface proteins like changing disguises). (Exam Tip: This is why you can get Gonorrhea multiple times, why natural immunity doesn't last, and why there is no vaccine).
- Virulence Factor: PorB (a surface protein). It is crucial for adhesion and induces apoptosis (programmed cell death) of the host epithelial barrier, allowing the bacteria to invade deeply into the tissue.
- Systemic Spread: While it usually causes local inflammation, it can enter the blood causing Disseminated Gonococcal Infection (DGI), leading to: Arthritis (classic swollen, hot, painful knee joint), Endocarditis (heart valve infection), Meningitis (brain lining infection), and Pneumonia.
Clinical Presentation:
- General: Greenish-yellow discharge with an unpleasant odor. Frequent and highly uncomfortable/painful urination (dysuria).
- Males: Very obvious symptoms. Men often complain of feeling like they are "peeing razor blades" with a thick, copious pus-like discharge dripping from the penis.
Untreated Complications: PID in women, permanent Infertility in both men and women (due to epididymitis in men scarring the sperm tubes).
Materno-neonatal: Membrane rupture, premature delivery. Most famously causes blinding neonatal conjunctivitis (ophthalmia neonatorum) when the baby passes through the infected birth canal. This is why erythromycin ointment is routinely put in newborn babies' eyes immediately after birth.
Laboratory Diagnosis (Crucial for Exams):
- Collection: Similar to T. vaginalis (Amies medium, rapid transport).
- Direct Microscopy: Gram-stained smear of exudate/pus reveals polymorphonuclear leukocytes (pus white blood cells) packed tightly with Gram-negative diplococci strictly inside them (intracellular).
- Culture: Must use highly nutritious agar. Traditionally grown on Thayer-Martin agar (a specific type of Chocolate agar infused with antibiotics like Vancomycin, Colistin, and Nystatin to kill off all normal flora so ONLY Neisseria can grow) in a 5% Carbon Dioxide (CO₂) atmosphere for 48 hours. They form translucent, tiny colonies that are oxidase positive.
- Confirmation (Biochemicals): Confirm by carbohydrate utilization. N. gonorrhoeae ferments Glucose (Positive), but is Negative for Lactose, Sucrose, and Maltose.
- Rapid Methods: Antigen detection or Nucleic Acid Amplification Tests (NAAT).

4. Chlamydia

Aetiology & Pathogenesis:
- Caused by the obligate intracellular bacterium Chlamydia trachomatis. (Obligate intracellular means it behaves like a virus; it MUST get inside a host cell to survive and replicate because it cannot make its own ATP energy).
- The Biphasic Life Cycle: It exists in two forms. The Elementary Body (EB) is the infectious, tough outer form that enters the cell. Once inside, it transforms into the Reticulate Body (RB), which is the fragile, replicating form.
- Invasion: Infection begins by colonizing host cells using sialic acid receptors as binding sites on the epithelial cells.
- Immune Evasion: There is a notable absence of phagocytes, T-cells, or B-cells initially in the genitalia. Once inside a host phagocyte, its unique cell wall inhibits phagolysosome fusion. This means the host cell cannot dump acid on it to digest it, allowing it to multiply safely inside the cell until the cell bursts.
Serotypes (Important Exam Distinction): There are 15 total serotypes.
- Serovars D through K: Cause standard sexually transmitted urogenital infections (urethritis, cervicitis).
- Serovars L1, L2, L3: Cause a more invasive, systemic STI called Lymphogranuloma venereum (LGV), which causes massively swollen, painful, pus-draining lymph nodes in the groin called "buboes".
Clinical Presentation:
- Often completely asymptomatic (known as "the silent epidemic"). When symptoms occur: Cervical infection, urethral infection, painful urination in both sexes.
- In men: a thin, clear, watery or pus-like discharge (compared to the thick purulent discharge of Gonorrhea).
Complications: PID, Peri-hepatitis (Fitz-Hugh-Curtis syndrome - inflammation of the liver capsule causing severe right upper quadrant pain, often visually described as "violin-string adhesions" between the liver and abdominal wall).
Neonatal: Conjunctivitis (appears slightly later than gonorrheal conjunctivitis, usually 1-2 weeks post-birth) and distinct neonatal pneumonia (often characterized by a classic "staccato cough").
Laboratory Diagnosis:
- Because it is strictly intracellular, it cannot be grown on normal agar plates.
- Gold Standard today: Nucleic Acid Amplification Tests (NAAT) from a simple urine catch or swabs. It is incredibly sensitive because it looks for the DNA of the bacteria.
- Other methods: Enzyme-linked immunosorbent assay (ELISA), Direct fluorescent antibody test (DFA).
- Culture: Requires living cell culture lines (like McCoy cells) to grow, which is slow, difficult, and extremely expensive.

5. Syphilis

Aetiology: Caused by the spirochete (spiral/corkscrew-shaped) bacterium Treponema pallidum.
Clinical Manifestations (The Stages):
- Primary Syphilis: Presents as a single, firm, painless ulcer (called a chancre) exactly at the site of inoculation (genitals, rectum, or mouth). It usually heals entirely on its own within a few weeks, deceiving the patient into thinking they are cured.
- Secondary Syphilis: Occurs 4-8 weeks after the primary ulcer heals. The bacteria have disseminated via the bloodstream. Characterized by a highly infectious generalized lesions/rash on the skin (specifically including the palms of the hands and soles of the feet—very few rashes do this!), mucous membrane lesions (condylomata lata), fever, and generalized malaise.
- Latent Syphilis: Can develop in 1/3 of untreated patients. No visible symptoms whatsoever, but the bacteria are slowly manifesting systemically in the organs.
- Tertiary (Complications): Severe organ damage appearing years or decades later. Neurologic conditions (neurosyphilis causing paralysis, shuffling gait, severe dementia), Cardiovascular disease (destroying the aorta causing deadly aortic aneurysms), and severe destructive/necrotic lesions on the skin/bones (called gummas). Death can easily occur.
Materno-neonatal: Causes stillbirths or severe congenital syphilis (babies born with deformed "saddle noses", saber shins, deafness, blindness, and notched "Hutchinson teeth").
Specimen Collection & Diagnosis:
- Collection: Wear protective rubber gloves (the fluid is insanely contagious). Cleanse around the ulcer using a swab moistened with physiological saline. Remove any scab. Gently squeeze the lesion to obtain the clear, highly infectious serous fluid. Collect a drop on a cover slip and invert onto a microscope slide.
- Microscopy: Deliver immediately to the lab for Dark Field Microscopy. You cannot see T. pallidum on a regular Gram stain because the organism is too thin and lacks a normal peptidoglycan cell wall to hold the dye. Under a dark field, they look like glowing silver spirals darting across a pitch-black background.
- Alternative Microscopy: UV microscopy after staining with fluorescein-labeled anti-treponemal Antibodies.
- Serology: Blood tests are the mainstay. Non-treponemal screening tests (like VDRL/RPR) detect the body's general antibody response to tissue damage. Confirm positive screens with Treponemal specific tests (like FTA-ABS).
Clinical Tidbit (Jarisch-Herxheimer Reaction): When you treat Syphilis with a massive dose of Penicillin, millions of spirochetes die and burst open at once, flooding the blood with toxins. The patient will suddenly develop a high fever, chills, and muscle aches a few hours after the injection. This is normal and means the drug is working!

6. Other Genital Ulcer Diseases: Chancroid vs. Donovanosis

🔥 EXAM TIP: Differentiating Ulcers

Read the clinical vignette carefully to spot the difference:

If the question says PAINLESS ulcer with hard edges = Think Syphilis (Treponema pallidum).
If the question says PAINFUL ulcer with ragged/soft edges = Think Chancroid (Haemophilus ducreyi) or Herpes (if blistering).

Chancroid:
- Aetiology: Haemophilus ducreyi.
- Pathogenesis: Gains access through minute breaks in the mucosal epithelium during sex. Drains strictly to regional lymph nodes in the groin, causing them to swell painfully and fill with pus (buboes). Does not disseminate further into the body systemically.
- Clinical: A "Soft sore"—a genital ulcer that is shallow, ragged, bleeds easily, and is extremely painful.
- Lab: Very difficult to view microscopically (often described as "schools of fish" arrangement) and notoriously difficult to culture.
Donovanosis (Granuloma Inguinale):
- Aetiology: Klebsiella granulomatis.
- Clinical: Causes slowly progressive, highly vascular, "beefy-red" ulcerative granuloma inguinale on the genitalia. The ulcers bleed easily upon contact. The lymph nodes are notably less involved compared to chancroid (no true buboes).
- Diagnosis: Diagnosed by taking deep tissue scrapings, staining with Giemsa stain, and finding pathognomonic intracellular Donovan bodies (safety-pin shaped bacteria tightly clustered inside large host macrophages).
Herpes Simplex Virus (HSV):
- Pathogenesis & Clinical: Lesions begin as small papules that rapidly develop into extremely painful, ulcerating vesicles (fluid-filled blisters) grouped tightly on a red base. Accompanied by swollen, tender lymph nodes, fever, headache, and severe malaise. The virus then travels up the nerves and hides dormant in the sacral ganglia, causing lifelong recurrent outbreaks.
- Diagnosis: Virus can be isolated from vesicle fluid and ulcer swabs. A classic rapid test is the Tzanck smear looking for "multinucleated giant cells." The specific isolate is typed (to distinguish HSV-1 from HSV-2) using immunofluorescence with type-specific monoclonal antibodies.

Summary of Pathogens by Swab Location

For clinical processing, labs expect certain organisms based on where the swab was taken. (Highly testable classification).

1. Pathogenic Isolates (The Bad Guys)

Urethral Swabs: Neisseria gonorrhoeae, Chlamydia trachomatis (serovars D-K), Ureaplasma, Mycoplasma, and Trichomonas vaginalis.
Cervical Swabs (Non-puerperal / not related to childbirth): N. gonorrhoeae, C. trachomatis (D-K), Streptococcus pyogenes, Herpes Simplex Virus.
Cervical Swabs (Puerperal Sepsis or Septic Abortion): Suggests a massive invasive infection often involving normal gut/skin flora turning pathogenic due to dead tissue/blood. Includes: Streptococcus pyogenes, other beta-hemolytic streptococci, Staphylococcus aureus, Enterococcus species, anaerobic cocci, Clostridium spp. (including C. perfringens which causes gangrene), Bacteroides, E. coli, Proteus, Listeria monocytogenes.
Genital Ulcer Specimens: Treponema pallidum (Syphilis), Haemophilus ducreyi (Chancroid), Klebsiella (Calymmatobacterium) granulomatis (Donovanosis), Chlamydia trachomatis (serovars L1, L2, L3 - LGV), Herpes Simplex Virus.

2. Normal Commensal Flora (Do not treat if found in these locations)

Urethral Swabs: Diphtheroids, Acinetobacter species, enterobacteria. Normal skin commensals (like Coagulase-Negative Staphylococci / CoNS) may also be present due to proximity to the outer skin.
Cervical Swabs: The upper canal of the cervix is normally sterile.
Vaginal Swabs (Puberty to Menopause): During the reproductive years, high estrogen levels cause vaginal cells to store glycogen. The normal flora is heavily dominated by Lactobacilli (which eat the glycogen and convert it into lactic acid, dropping the pH to protect the vagina). Also contains anaerobic/microaerophilic streptococci, Clostridium sp., Bacteroides, Acinetobacter, fusobacteria, G. vaginalis, Mycoplasma, and small numbers of diphtheroids and yeasts.
Vaginal Swabs (After Menopause): Without estrogen, glycogen levels drop, lactobacilli starve and die off, and the pH becomes alkaline. The flora naturally shifts to Diphtheroids, micrococci, Staphylococcus epidermidis, viridans streptococci, enterobacteria, Candida albicans, and other yeasts.

Specific Note on Iatrogenic Infections

As covered briefly above, iatrogenic infections are medically induced. The uterus is a sterile cavity. When doctors or midwives perform procedures like inserting Intrauterine Devices (IUDs), conducting induced abortions, or assisting in delivery, they risk breaching this sterile barrier. If instruments aren't perfectly sterile, or if they push vaginal commensals (like Bacteroides or E. coli) upward through the cervix, a severe infection ensues.

Red-Flag Symptoms to watch for post-procedure:

Example Scenario: A woman presents to the clinic 3 days after an elective abortion complaining of:

Severe, deep pain in the pelvic region.
Sudden high fevers accompanied by chills (indicating systemic spread/bacteremia).
Menstrual disturbances.
Pain during intercourse (dyspareunia).
Unusual, foul-smelling vaginal discharge.

Action: This is a medical emergency requiring broad-spectrum intravenous antibiotics immediately to prevent septic shock and permanent uterine scarring.

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