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explain in detail baout topics from apurba sastri must to know good to know and undertadingd concept

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bacterial vaginosis clue cells vaginal smear

This four-panel image provides a side-by-side comparison of Bacterial Vaginosis (BV) and a normal vaginal microbiome through colposcopic and microscopic examinations. Panels A and B are colposcopic clinical photographs of the cervix and vaginal vault. Panel A (BV) displays characteristic thin, homogeneous, milk-white discharge coating the vaginal walls. In contrast, Panel B (Normal) shows a healthy cervix with clear, physiological secretions. Panels C and D show Gram-stained microscopic slides of vaginal smears. Panel C (BV) demonstrates the presence of 'clue cells'—vaginal epithelial cells heavily encrusted with coccobacilli (Gardnerella-like microbes) that obscure the cell margins. Panel D (Normal) shows a healthy microbiome dominated by large, purple-stained Gram-positive rods, consistent with Lactobacillus species, and clear epithelial cells without bacterial adherence. This comparison illustrates the clinical and laboratory findings used in Amsel criteria and Nugent scoring for the diagnosis of dysbiosis in the female reproductive tract.

This four-panel image provides a side-by-side comparison of Bacterial Vaginosis (BV) and a normal vaginal microbiome through colposcopic and microscopic examinations. Panels A and B are colposcopic clinical photographs of the cervix and vaginal vault. Panel A (BV) displays characteristic thin, homogeneous, milk-white discharge coating the vaginal walls. In contrast, Panel B (Normal) shows a healthy cervix with clear, physiological secretions. Panels C and D show Gram-stained microscopic slides of vaginal smears. Panel C (BV) demonstrates the presence of 'clue cells'—vaginal epithelial cells heavily encrusted with coccobacilli (Gardnerella-like microbes) that obscure the cell margins. Panel D (Normal) shows a healthy microbiome dominated by large, purple-stained Gram-positive rods, consistent with Lactobacillus species, and clear epithelial cells without bacterial adherence. This comparison illustrates the clinical and laboratory findings used in Amsel criteria and Nugent scoring for the diagnosis of dysbiosis in the female reproductive tract.

This comparison chart utilizes optical coherence tomography (OCT) or similar high-resolution diagnostic imaging to illustrate the progression of a polymicrobial bacterial vaginosis (BV) biofilm. The visual is divided into three sequential panels. The first panel, labeled 'BV', depicts a dense, continuous, and brightly fluorescent orange-red layer adhering to the vaginal epithelial surface, representing a mature pathogenic biofilm often composed of Gardnerella vaginalis and Atopobium vaginae. The middle panel shows the clinical intervention with 'Metronidazole', showing a blue-tinted transitional phase where the biofilm structure is being disrupted. The final panel, labeled 'Asymptomatic', demonstrates the state after treatment. In this state, the biofilm appears less dense, fragmented, and more diffuse, indicating successful thinning and disruption of the adhering microbial community. This educational visual emphasizes the persistence of subclinical biofilms even in asymptomatic states, which contributes to the high recurrence rates of BV. It is designed for medical professionals and students focusing on gynecology, microbiology, and infectious disease management.

This comparison chart utilizes optical coherence tomography (OCT) or similar high-resolution diagnostic imaging to illustrate the progression of a polymicrobial bacterial vaginosis (BV) biofilm. The visual is divided into three sequential panels. The first panel, labeled 'BV', depicts a dense, continuous, and brightly fluorescent orange-red layer adhering to the vaginal epithelial surface, representing a mature pathogenic biofilm often composed of Gardnerella vaginalis and Atopobium vaginae. The middle panel shows the clinical intervention with 'Metronidazole', showing a blue-tinted transitional phase where the biofilm structure is being disrupted. The final panel, labeled 'Asymptomatic', demonstrates the state after treatment. In this state, the biofilm appears less dense, fragmented, and more diffuse, indicating successful thinning and disruption of the adhering microbial community. This educational visual emphasizes the persistence of subclinical biofilms even in asymptomatic states, which contributes to the high recurrence rates of BV. It is designed for medical professionals and students focusing on gynecology, microbiology, and infectious disease management.

Conventional Pap smear cytology of a cervicovaginal sample stained with Papanicolaou stain. The smear demonstrates abundant squamous epithelial cells with clusters of intermediate and superficial cells. Within these cell clusters there are numerous oval budding yeast forms measuring 1–2 μm and filamentous pseudohyphae; the pseudohyphae are eosinophilic and stain unevenly, extending between cells and forming short branches. A prominent neutrophilic inflammatory component is present. The yeast elements and pseudohyphae are characteristic of Candida species (most commonly Candida albicans) causing vulvovaginitis or cervicitis in appropriate clinical settings. These features differentiate from non-filamentous yeasts and from malignant cells, and are best corroborated by clinical symptoms (pruritus, discharge) and culture or adjunct studies. Diagnostic significance lies in identifying fungal infection with inflammatory response; differential diagnoses include other Candida species, other yeasts lacking pseudohyphae, bacterial superinfection, or non-infectious causes of inflammation. The specimen shows no cytologic evidence of neoplasia. This image is useful for education on fungal cytology, diagnostic verification of candidiasis in cervical/vaginal cytology, and correlates with antifungal therapy planning. Clinicians should consider repeat smear or culture if symptoms persist despite therapy. Pathologic correlation: Candida infection; fungal morphology; budding yeast; pseudohyphae; neutrophils; cervicovaginal candidiasis.

Conventional Pap smear cytology of a cervicovaginal sample stained with Papanicolaou stain. The smear demonstrates abundant squamous epithelial cells with clusters of intermediate and superficial cells. Within these cell clusters there are numerous oval budding yeast forms measuring 1–2 μm and filamentous pseudohyphae; the pseudohyphae are eosinophilic and stain unevenly, extending between cells and forming short branches. A prominent neutrophilic inflammatory component is present. The yeast elements and pseudohyphae are characteristic of Candida species (most commonly Candida albicans) causing vulvovaginitis or cervicitis in appropriate clinical settings. These features differentiate from non-filamentous yeasts and from malignant cells, and are best corroborated by clinical symptoms (pruritus, discharge) and culture or adjunct studies. Diagnostic significance lies in identifying fungal infection with inflammatory response; differential diagnoses include other Candida species, other yeasts lacking pseudohyphae, bacterial superinfection, or non-infectious causes of inflammation. The specimen shows no cytologic evidence of neoplasia. This image is useful for education on fungal cytology, diagnostic verification of candidiasis in cervical/vaginal cytology, and correlates with antifungal therapy planning. Clinicians should consider repeat smear or culture if symptoms persist despite therapy. Pathologic correlation: Candida infection; fungal morphology; budding yeast; pseudohyphae; neutrophils; cervicovaginal candidiasis.

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genital warts condyloma acuminata HPV

Clinical photograph of the female external genitalia showing extensive human papillomavirus (HPV) infection presenting as condyloma acuminata (genital warts). The lesions are characterized by multiple raised, exophytic, and papillary growths with a verrucous (cauliflower-like) texture. The distribution is widespread across the vulvar area, involving the labia minora, labia majora, and the vaginal introitus. Morphologically, the lesions appear flesh-colored to pale pink, with some areas exhibiting a whitish, hyperkeratotic surface. There is evidence of epithelial thickening and irregular surface contours, deviating from normal smooth mucosal architecture. This image illustrates the typical clinical presentation of low-risk HPV-induced benign neoplasia, which is a key diagnostic feature in gynecology and dermatology for distinguishing between infectious viral warts and other vulvar intraepithelial neoplasia (VIN) or malignant conditions.

Clinical photograph of the female external genitalia showing extensive human papillomavirus (HPV) infection presenting as condyloma acuminata (genital warts). The lesions are characterized by multiple raised, exophytic, and papillary growths with a verrucous (cauliflower-like) texture. The distribution is widespread across the vulvar area, involving the labia minora, labia majora, and the vaginal introitus. Morphologically, the lesions appear flesh-colored to pale pink, with some areas exhibiting a whitish, hyperkeratotic surface. There is evidence of epithelial thickening and irregular surface contours, deviating from normal smooth mucosal architecture. This image illustrates the typical clinical presentation of low-risk HPV-induced benign neoplasia, which is a key diagnostic feature in gynecology and dermatology for distinguishing between infectious viral warts and other vulvar intraepithelial neoplasia (VIN) or malignant conditions.

Two-panel clinical photograph demonstrating condyloma acuminata (genital warts) and its surgical management in a patient with systemic lupus erythematosus. Image (a) shows extensive, multifocal, hypertrophic verrucous lesions involving the vulva, perineum, and perianal region. The lesions exhibit a classic 'cauliflower-like' morphology with a rough, filiform texture and varied pigmentation ranging from skin-toned to brownish-grey. Image (b) shows the same anatomical region post-surgical excision. The surgical site features approximated skin edges secured with blue interrupted sutures extending through the labia and perineum. A yellow drainage tube is positioned for fluid management. Evidence of post-operative erythema and inflammation is visible. This comparison illustrates the clinical manifestation of severe HPV-related verrucous disease in an immunocompromised state and the immediate results of surgical debulking and reconstruction.

Two-panel clinical photograph demonstrating condyloma acuminata (genital warts) and its surgical management in a patient with systemic lupus erythematosus. Image (a) shows extensive, multifocal, hypertrophic verrucous lesions involving the vulva, perineum, and perianal region. The lesions exhibit a classic 'cauliflower-like' morphology with a rough, filiform texture and varied pigmentation ranging from skin-toned to brownish-grey. Image (b) shows the same anatomical region post-surgical excision. The surgical site features approximated skin edges secured with blue interrupted sutures extending through the labia and perineum. A yellow drainage tube is positioned for fluid management. Evidence of post-operative erythema and inflammation is visible. This comparison illustrates the clinical manifestation of severe HPV-related verrucous disease in an immunocompromised state and the immediate results of surgical debulking and reconstruction.

This gross clinical photograph shows external genital warts (condylomata acuminata) arising from the penile shaft and adjacent pubic skin. The image demonstrates multiple raised, flesh-colored papules with a rough, keratotic surface, arranged in clusters along the hair-bearing genital skin. The lesions are exophytic and papillomatous, measuring a few millimeters to over a centimeter in greatest dimension, with subtle erythema at the base and no obvious ulceration or drainage. The appearance is characteristic for HPV-induced genital warts, most commonly caused by HPV types 6 and 11, though other oncogenic types (2, 16, 18, 31, 33, 35, 39, 45, 51–56, 59) can be involved. Clinical diagnosis is supported by the typical morphology: verrucous, pink-to-flesh-colored papules that may coalesce into plaques. In the absence of histology, koilocytosis and epithelial hyperplasia would be expected on biopsy. Transmission is via sexual contact with minor trauma; autoinoculation and concurrent sexually transmitted infections may occur; incidence is higher in sexually active adults aged 20–40. The image is useful for educational illustration, differential diagnosis with verruca vulgaris and condyloma lata, and for teaching clinicians to recognize HPV-related anogenital lesions and counsel patients regarding treatment and prevention. Management considerations include topical therapy, ablative options, and vaccination discussion with patients.

This gross clinical photograph shows external genital warts (condylomata acuminata) arising from the penile shaft and adjacent pubic skin. The image demonstrates multiple raised, flesh-colored papules with a rough, keratotic surface, arranged in clusters along the hair-bearing genital skin. The lesions are exophytic and papillomatous, measuring a few millimeters to over a centimeter in greatest dimension, with subtle erythema at the base and no obvious ulceration or drainage. The appearance is characteristic for HPV-induced genital warts, most commonly caused by HPV types 6 and 11, though other oncogenic types (2, 16, 18, 31, 33, 35, 39, 45, 51–56, 59) can be involved. Clinical diagnosis is supported by the typical morphology: verrucous, pink-to-flesh-colored papules that may coalesce into plaques. In the absence of histology, koilocytosis and epithelial hyperplasia would be expected on biopsy. Transmission is via sexual contact with minor trauma; autoinoculation and concurrent sexually transmitted infections may occur; incidence is higher in sexually active adults aged 20–40. The image is useful for educational illustration, differential diagnosis with verruca vulgaris and condyloma lata, and for teaching clinicians to recognize HPV-related anogenital lesions and counsel patients regarding treatment and prevention. Management considerations include topical therapy, ablative options, and vaccination discussion with patients.

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molluscum contagiosum pearly dome shaped papules umbilicated

This is a clinical dermatology photograph illustrating Molluscum contagiosum. Modality and technique: clinical photography; perspective: close-up, surface view of the skin. Anatomical context: cutaneous epidermis, likely trunk or extremities. The image shows multiple small, discrete, dome-shaped papules, 2–5 mm in diameter, with smooth, slightly shiny surfaces and a central umbilication. Lesions are flesh-colored to pale pink against normal skin; surrounding skin may be mildly erythematous in susceptible individuals. Papules appear clustered in groups, consistent with localized contagion and autoinoculation. There is no crusting, scaling, vesiculation, or pustulation evident. Overall, the pattern is highly suggestive of molluscum contagiosum, a benign poxvirus infection. If histology were obtained, one would expect Henderson-Patterson bodies within keratinocytes. Clinically, molluscum presents as painless, pearly, umbilicated papules, most common in children but also seen in adults with atopy or immunosuppression. Differential considerations include verruca vulgaris, epidermal inclusion cysts, milia, syringomas, and folliculitis; central umbilication helps distinguish molluscum. Clinical significance: contagious via direct contact and fomites; usually self-limited but treated in persistent or symptomatic cases. This image is suitable for dermatology education, visual diagnosis training, pediatric skin disease curricula, and clinical decision support. Endemic in many regions; consider screening for other pediatric skin infections.

This is a clinical dermatology photograph illustrating Molluscum contagiosum. Modality and technique: clinical photography; perspective: close-up, surface view of the skin. Anatomical context: cutaneous epidermis, likely trunk or extremities. The image shows multiple small, discrete, dome-shaped papules, 2–5 mm in diameter, with smooth, slightly shiny surfaces and a central umbilication. Lesions are flesh-colored to pale pink against normal skin; surrounding skin may be mildly erythematous in susceptible individuals. Papules appear clustered in groups, consistent with localized contagion and autoinoculation. There is no crusting, scaling, vesiculation, or pustulation evident. Overall, the pattern is highly suggestive of molluscum contagiosum, a benign poxvirus infection. If histology were obtained, one would expect Henderson-Patterson bodies within keratinocytes. Clinically, molluscum presents as painless, pearly, umbilicated papules, most common in children but also seen in adults with atopy or immunosuppression. Differential considerations include verruca vulgaris, epidermal inclusion cysts, milia, syringomas, and folliculitis; central umbilication helps distinguish molluscum. Clinical significance: contagious via direct contact and fomites; usually self-limited but treated in persistent or symptomatic cases. This image is suitable for dermatology education, visual diagnosis training, pediatric skin disease curricula, and clinical decision support. Endemic in many regions; consider screening for other pediatric skin infections.

Imaging modality: Clinical photography of dermatologic lesions using color digital capture. The subject is in vivo skin on the forearm/elbow region. The view shows multiple small, discrete, dome-shaped papules ranging 2–5 mm in diameter. Lesions are pink to flesh-colored with a subtle sheen. Several papules appear slightly umbilicated, a classic feature of Molluscum contagiosum; the surface is smooth with minimal scaling or crusting. The distribution is localized to the extensor forearm without extensive involvement of other sites in this image. The epidermis over the lesions is mildly elevated, and the surrounding skin shows dermatitis-like redness, which can accompany secondary irritation. Molluscum contagiosum is a poxvirus-induced dermal infection commonly seen in children but also in adults, transmitted by direct contact or shared items. The image depicts typical clinical morphology: pearly to flesh-toned papules with central indentation and mild erythema. Imaging alone is not diagnostic; histopathology would show molluscum bodies within keratinocytes. Clinically, the diagnosis is supported by autoinoculation and spread pattern, especially in immunocompromised individuals. Differential considerations include viral warts (HPV), folliculitis, and spongiotic dermatitis. Management ranges from observation for spontaneous resolution to destructive therapies such as curettage, cantharidin, and cryotherapy, with infection control and cosmetic considerations. This image serves as a reference for recognition, tele-dermatology triage, and differential diagnosis practice.

Imaging modality: Clinical photography of dermatologic lesions using color digital capture. The subject is in vivo skin on the forearm/elbow region. The view shows multiple small, discrete, dome-shaped papules ranging 2–5 mm in diameter. Lesions are pink to flesh-colored with a subtle sheen. Several papules appear slightly umbilicated, a classic feature of Molluscum contagiosum; the surface is smooth with minimal scaling or crusting. The distribution is localized to the extensor forearm without extensive involvement of other sites in this image. The epidermis over the lesions is mildly elevated, and the surrounding skin shows dermatitis-like redness, which can accompany secondary irritation. Molluscum contagiosum is a poxvirus-induced dermal infection commonly seen in children but also in adults, transmitted by direct contact or shared items. The image depicts typical clinical morphology: pearly to flesh-toned papules with central indentation and mild erythema. Imaging alone is not diagnostic; histopathology would show molluscum bodies within keratinocytes. Clinically, the diagnosis is supported by autoinoculation and spread pattern, especially in immunocompromised individuals. Differential considerations include viral warts (HPV), folliculitis, and spongiotic dermatitis. Management ranges from observation for spontaneous resolution to destructive therapies such as curettage, cantharidin, and cryotherapy, with infection control and cosmetic considerations. This image serves as a reference for recognition, tele-dermatology triage, and differential diagnosis practice.

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Chlamydia trachomatis elementary body reticulate body intracellular

A pathophysiology diagram illustrating the biphasic developmental cycle of Chlamydia trachomatis within a columnar epithelial host cell. The process is mapped across six key stages: (1) Cellular invasion, where infectious green Elementary Bodies (EBs) adhere and enter via cytoskeletal rearrangement; (2) Primary differentiation of EBs into larger blue replicative Reticulate Bodies (RBs) within an initial inclusion; (3) RB replication via binary fission and inclusion expansion (8-48 hours post-infection); (4) A persistence pathway where stressors induce the formation of orange Aberrant Bodies (ABs); (5) Secondary differentiation as RBs convert back into EBs (24-72 hours); and (6) EB release through host cell lysis or extrusion. The diagram highlights molecular mediators, including Type III Secretion System (T3SS) effectors (e.g., TarP, TmeA), transcription factors (e.g., ChxR, ArgR), and proteases (e.g., CPAF). A central temporal dial correlates these morphological changes with hours post-infection (hPI). This educational resource characterizes the intracellular pathogenesis of Chlamydia, detailing the transition between infectious and replicative forms.

A pathophysiology diagram illustrating the biphasic developmental cycle of Chlamydia trachomatis within a columnar epithelial host cell. The process is mapped across six key stages: (1) Cellular invasion, where infectious green Elementary Bodies (EBs) adhere and enter via cytoskeletal rearrangement; (2) Primary differentiation of EBs into larger blue replicative Reticulate Bodies (RBs) within an initial inclusion; (3) RB replication via binary fission and inclusion expansion (8-48 hours post-infection); (4) A persistence pathway where stressors induce the formation of orange Aberrant Bodies (ABs); (5) Secondary differentiation as RBs convert back into EBs (24-72 hours); and (6) EB release through host cell lysis or extrusion. The diagram highlights molecular mediators, including Type III Secretion System (T3SS) effectors (e.g., TarP, TmeA), transcription factors (e.g., ChxR, ArgR), and proteases (e.g., CPAF). A central temporal dial correlates these morphological changes with hours post-infection (hPI). This educational resource characterizes the intracellular pathogenesis of Chlamydia, detailing the transition between infectious and replicative forms.

A pathophysiology diagram illustrating the immune response to Chlamydia trachomatis infection in human mucosa. The top section depicts the initial infection phase, where C. trachomatis elementary bodies (EBs) enter columnar epithelial cells to form intracellular inclusions. Within the underlying mucosa, the diagram shows the recruitment and activation of myeloid dendritic cells, macrophages, T cells, B cells (secreting MOMP antibodies), and neutrophils (contributing to cell death). A central hexagonal node represents the massive release of inflammatory cytokines (IFN-γ, IL-6, IL-8, IL-12, IL-10), which leads to a divergence between pathogenesis (tissue injury) and epithelial protection. The lower portion details acute inflammation and post-infection sequelae, highlighting the role of plasmacytoid dendritic cells, B cells, and T cells in IFN-γ production. This phase transitions into a persistent autoimmune response involving Ct-hsp10 and Ct-hsp60 antibodies, ultimately resulting in collateral tissue damage and scar formation. The diagram is designed for intermediate-level medical education on infectious disease immunology and gynecological pathology.

A pathophysiology diagram illustrating the immune response to Chlamydia trachomatis infection in human mucosa. The top section depicts the initial infection phase, where C. trachomatis elementary bodies (EBs) enter columnar epithelial cells to form intracellular inclusions. Within the underlying mucosa, the diagram shows the recruitment and activation of myeloid dendritic cells, macrophages, T cells, B cells (secreting MOMP antibodies), and neutrophils (contributing to cell death). A central hexagonal node represents the massive release of inflammatory cytokines (IFN-γ, IL-6, IL-8, IL-12, IL-10), which leads to a divergence between pathogenesis (tissue injury) and epithelial protection. The lower portion details acute inflammation and post-infection sequelae, highlighting the role of plasmacytoid dendritic cells, B cells, and T cells in IFN-γ production. This phase transitions into a persistent autoimmune response involving Ct-hsp10 and Ct-hsp60 antibodies, ultimately resulting in collateral tissue damage and scar formation. The diagram is designed for intermediate-level medical education on infectious disease immunology and gynecological pathology.

Here is the complete, detailed breakdown of all topics from the Genital Tract Infections slide (Apurba Sastri Microbiology curriculum), organized into Must Know, Good to Know, and Understanding the Concept for each topic.

GENITAL TRACT INFECTIONS - Complete Topic Breakdown

(Apurba Sastri / Dr. Shreyashi's Curriculum)

OVERVIEW - Understanding the Framework

The genital tract can be infected at multiple levels:
  • Lower tract: Vulva, vagina, cervix, urethra, Bartholin's gland
  • Upper tract: Uterus, fallopian tubes, ovaries (PID)
Key pathogens are divided into:
  • Bacteria: N. gonorrhoeae, C. trachomatis, G. vaginalis, Mycoplasma, Treponema
  • Viruses: HPV, HSV, Poxvirus (Molluscum)
  • Parasites: Trichomonas vaginalis
  • Fungi: Candida albicans
Normal vaginal pH is acidic (3.8-4.5), maintained by Lactobacillus species. When this protection is disrupted, infections emerge.

1. VAGINITIS

Must Know

FeatureBacterial VaginosisCandidiasisTrichomoniasis
CauseGardnerella vaginalis + anaerobesCandida albicansTrichomonas vaginalis (protozoan)
DischargeThin, gray-white, fishy smellThick white "curd-like"Yellow, frothy, foul
pH>4.5<4.5>4.5
Wet MountClue cellsPseudohyphae + budding yeastMotile flagellated trophozoites
KOH (Whiff test)POSITIVE (fishy amine odor)NegativeNegative
STI?No (dysbiosis)NoYes
TreatmentMetronidazoleFluconazole / ClotrimazoleMetronidazole

Good to Know

  • Trichomoniasis causes "strawberry cervix" - fiery red cervical mucosa with dilated vessels on colposcopy
  • T. vaginalis is the most prevalent non-viral STI worldwide (~3.7 million in the US alone)
  • Only 30% of T. vaginalis infected people develop symptoms
  • Trichomoniasis in pregnancy causes premature rupture of membranes and preterm delivery
  • Candidiasis is NOT an STI - it is a disruption of normal flora; predisposing factors include diabetes, pregnancy, antibiotics, immunosuppression (neutrophil/Th17 deficiency)
  • Amsel criteria (for BV): requires 3 of 4 - homogeneous discharge, pH >4.5, clue cells on wet mount, positive whiff test

Understanding the Concept

The key concept in vaginitis is vaginal microbiome balance. Normally, Lactobacillus dominates and produces lactic acid keeping pH low. In BV, there is a polymicrobial dysbiosis - Lactobacillus is depleted, and Gardnerella vaginalis, Prevotella, Mobiluncus, and anaerobes overgrow. This is NOT an infection by a single new pathogen - it is an ecological shift. Clue cells are vaginal epithelial cells studded with G. vaginalis (coccobacilli), giving them a shaggy, stippled border that obscures the cell margin.
BV vs Normal - Clue cells on gram smear
Panel C shows clue cells (BV); Panel D shows normal Lactobacillus-dominant microbiome

2. BACTERIAL VAGINOSIS (BV)

Must Know

  • Cause: Polymicrobial - Gardnerella vaginalis (primary), Mobiluncus, Prevotella, Peptostreptococcus
  • Key Gram stain finding: Clue cells = epithelial cells coated with coccobacilli
  • Whiff test: Adding 10% KOH to vaginal discharge releases amines - produces FISHY odor = POSITIVE
  • Nugent score: Used for lab diagnosis (Gram stain scoring of vaginal flora)
  • Amsel criteria: 3 of 4 required (homogeneous discharge, pH>4.5, clue cells, positive whiff)
  • Treatment: Metronidazole (oral or vaginal gel)

Good to Know

  • BV in pregnancy: associated with premature labor, preterm birth, and postpartum endometritis
  • BV increases susceptibility to HIV and other STIs by disrupting mucosal barrier
  • The attachment of N. gonorrhoeae to the cervix is actually ENHANCED by enzymes from the cervicovaginal microbiota in BV - this is a critical concept for understanding co-infections
  • Recurrence is very common (~50% in 1 year) - linked to biofilm formation by G. vaginalis

Understanding the Concept

BV is best understood as a microbiome imbalance, not a classical infection. The dominant Lactobacillus (which produce H₂O₂ and lactic acid) are replaced by anaerobes. This raises vaginal pH, alters the immune environment, and allows opportunists to proliferate. The fishy odor comes from the production of amines (putrescine, cadaverine) by anaerobic bacteria metabolizing proteins - KOH volatilizes these amines.
Sources: Sherris & Ryan's Medical Microbiology 8e; Robbins & Kumar Basic Pathology; Tietz Textbook of Laboratory Medicine 7e

3. CERVICITIS

Must Know

  • Primary causes: Chlamydia trachomatis AND Neisseria gonorrhoeae (the two most important)
  • Emerging cause: Mycoplasma genitalium (responsible for up to 30% of recurrent cases)
  • Symptoms: Mucopurulent vaginal discharge, intermenstrual bleeding, pelvic pain, dyspareunia
  • Lab diagnosis: NAAT (Nucleic Acid Amplification Test) is the GOLD STANDARD - can be performed on genital swabs or urine
  • Complication: Can ascend to cause PID (pelvic inflammatory disease) - most important complication

Good to Know

  • Many cervicitis cases are asymptomatic: Only 6% of C. trachomatis infected females have symptoms; only 14% with N. gonorrhoeae have signs
  • Gonococcal cervicitis: Gram stain shows intracellular gram-negative diplococci inside neutrophils
  • Chlamydial cervicitis: Discharge is watery to mucopurulent with neutrophil predominance
  • Gonorrhea and Chlamydia co-infection is common, so treating for both simultaneously is standard practice
  • N. gonorrhoeae can disseminate causing: septic arthritis (knees most common), tenosynovitis, vesicular skin lesions, fever

Understanding the Concept

Cervicitis is the gateway infection to PID. Gonococcal PID spreads upward along mucosal surfaces (cervix → endocervix → fallopian tubes). This is why it causes acute suppurative salpingitis with neutrophil infiltration. Non-gonococcal (Chlamydial) PID spreads through lymphatics/venous channels rather than mucosa - causing deeper tissue inflammation. Endometrium is characteristically spared in gonorrhea (reason unknown), but fallopian tubes are severely affected.

4. BARTHOLINITIS (Bartholin Gland Abscess/Infection)

Must Know

  • Bartholin glands: Located at 4 o'clock and 8 o'clock positions at the vaginal introitus; provide lubrication during intercourse
  • Bartholinitis = infection/inflammation of the Bartholin gland or duct
  • Bartholin cyst = blockage of duct → duct distends with secretion (not infected); if infected = abscess
  • Organisms: Often polymicrobial - E. coli, Staphylococcus, Streptococci; STI organisms like N. gonorrhoeae and C. trachomatis may also cause it
  • Treatment:
    • Abscess: Incision and drainage (I&D) + Word catheter placement
    • Recurrent: Marsupialization (surgical creation of a permanent opening)
    • Excision reserved for carcinoma suspicion (especially in women >40)

Good to Know

  • Bartholin gland carcinoma is rare but must be excluded in older women with "recurrent bartholinitis"
  • Word catheter is placed into the cyst for drainage and reevaluated weekly - allows epithelialization of a permanent tract
  • Bartholin gland abscess is one of the most common vulvar emergencies seen in gynecology OPD

Understanding the Concept

The Bartholin gland opens via a duct. When the duct is blocked (by inflammation, debris, or anatomy), secretions accumulate forming a cyst. Secondary infection turns the cyst into a painful, fluctuant abscess. Because the gland sits in loose areolar tissue with rich blood supply, infections can spread rapidly. Marsupialization creates a permanent new opening, preventing recurrence by maintaining a patent drainage channel.

5. GENITAL WARTS (Condyloma Acuminata)

Must Know

  • Cause: Human Papillomavirus (HPV), primarily types 6 and 11 (LOW-RISK types - benign warts)
  • High-risk types (16, 18, 31, 33) - cause dysplasia and cancer, NOT warts
  • Appearance: Fleshy, exophytic, cauliflower-like, verrucous (warty) papules on genitals, perineum, perianal area
  • Histology key finding: Koilocytes = epithelial cells with pyknotic nuclei surrounded by a clear perinuclear halo (viral cytopathic effect)
  • Transmission: Sexual contact, also vertical (mother to child during delivery) → laryngeal papillomatosis in newborn
  • Diagnosis: Clinical (appearance); Pap smear/colposcopy for cervical HPV
  • Treatment: Podophyllin, Podophyllotoxin, Imiquimod (immune modifier), TCA (trichloroacetic acid), cryotherapy, laser, surgical excision

Good to Know

  • HPV is the most common STI globally
  • Condylomata acuminata = condyloma from Latin "pointed warts" (contrast with condyloma lata of syphilis which are FLAT)
  • Cervical HPV → CIN (cervical intraepithelial neoplasia) → cervical cancer (HPV 16/18 integration into host genome → inactivates p53 and Rb tumor suppressors)
  • Vaccination: Gardasil 9 (9-valent) protects against HPV 6, 11, 16, 18, 31, 33, 45, 52, 58
  • Aceto-white test: Application of 5% acetic acid to affected area turns warts white - used in colposcopy
Condyloma acuminata - cauliflower-like vulvar lesions
Multiple raised, verrucous, cauliflower-like lesions typical of HPV-induced condyloma acuminata

Understanding the Concept

HPV infects the basal layer of stratified squamous epithelium through micro-abrasions. Low-risk HPV types 6/11 stay episomal (not integrated into host DNA) and cause proliferative but benign warts. High-risk types 16/18 can integrate into the host genome, disrupting TP53 and RB tumor suppressors - leading to uncontrolled cell proliferation and eventual malignancy. This is why the same virus can cause both harmless warts AND cancer depending on the HPV type.
Sources: Robbins, Cotran & Kumar Pathologic Basis of Disease; Tietz Textbook of Laboratory Medicine 7e

6. MOLLUSCUM CONTAGIOSUM

Must Know

  • Cause: Molluscum Contagiosum Virus (MCV) - a Poxvirus (DNA virus)
  • 4 types: MCV-1 (most common overall), MCV-2 (most often sexually transmitted)
  • Appearance: Pearly, dome-shaped papules (1-5 mm), with central umbilication (dimple) - PATHOGNOMONIC
  • Histology: Henderson-Patterson bodies (molluscum bodies) = large eosinophilic intracytoplasmic inclusions in keratinocytes
  • Transmission:
    • Children (2-12 yr): Direct contact / fomites (towels, etc.) - trunk, arms, legs
    • Adults: Sexual transmission - genitals, lower abdomen, buttocks, inner thighs
  • Incubation: ~6 weeks
  • Self-limiting: Usually resolves in 6-12 months in immunocompetent patients

Good to Know

  • In HIV/immunosuppressed patients: lesions are large, numerous, and persistent (>100 lesions); atypical giant molluscum can occur on face
  • Diagnosis is clinical - based on characteristic appearance (pearly dome with central dimple)
  • Treatment when needed: Curettage, cryotherapy, cantharidin (vesicant), imiquimod, laser
  • NOT a notifiable STI but is considered a sexually transmissible infection in adults
Molluscum contagiosum - dome-shaped papules with central umbilication
Classic flesh-colored dome-shaped papules with central umbilication - hallmark of molluscum contagiosum

Understanding the Concept

The central umbilication (dimple) on molluscum papules is caused by the Henderson-Patterson bodies (huge intracytoplasmic poxvirus inclusions) filling and distending the keratinocytes, eventually causing the central epidermal breakdown and dimple. The "waxy core" you can express from the center contains these virus-laden cells. In immunocompromised patients, the failure of T-cell immunity to clear the virus explains the uncontrolled proliferation and extensive lesions.
Sources: Robbins, Cotran & Kumar Pathologic Basis of Disease; Goldman-Cecil Medicine

7. NON-GONOCOCCAL URETHRITIS (NGU)

Must Know

  • Definition: Urethritis NOT caused by N. gonorrhoeae
  • Most common cause: Chlamydia trachomatis (serovars D-K) - most common bacterial STI worldwide
  • Second cause: Mycoplasma genitalium - up to 30% of recurrent NGU in males
  • Other causes: Trichomonas vaginalis, Ureaplasma urealyticum, HSV
  • ~50% cases: No pathogen identified
  • Chlamydia lifecycle (MUST KNOW):
    • Elementary body (EB): Infectious, metabolically inert, extracellular form - enters host cell by receptor-mediated endocytosis
    • Reticulate body (RB): Non-infectious, metabolically active, intracellular replicating form - replicates using host cell energy
    • EB → RB → new EBs → cell lysis/extrusion → spread

Good to Know

  • Chlamydia is an obligate intracellular pathogen - cannot be grown on regular culture media; requires cell culture
  • Has affinity for columnar epithelial cells (cervix, urethra, conjunctiva, fallopian tube)
  • Clinical features of NGU are similar to gonococcal urethritis but generally milder: watery to mucoid discharge, dysuria, urethral itching
  • Complications of untreated Chlamydia:
    • Women: PID, infertility, ectopic pregnancy, chronic pelvic pain
    • Men: Epididymitis, prostatitis
    • Neonates (from infected mother during delivery): Ophthalmia neonatorum (conjunctivitis - most common) and neonatal pneumonia
    • Reactive arthritis (Reiter's syndrome): Urethritis + Arthritis + Conjunctivitis ("Can't see, can't pee, can't climb a tree")
  • Fitz-Hugh-Curtis syndrome: Perihepatitis caused by C. trachomatis (or gonorrhea) spreading to perihepatic capsule - presents as RUQ pain
Chlamydia trachomatis lifecycle - elementary and reticulate bodies
The biphasic developmental cycle: EB (infectious) → RB (replicating) → new EBs → lysis/extrusion

Understanding the Concept

The key concept for Chlamydia is its obligate intracellular existence and biphasic life cycle. Since Chlamydia cannot produce its own ATP ("energy parasite"), it must exist inside host cells. The EB is the "travel form" - tough enough to survive outside cells but metabolically dormant. Once inside, it converts to the RB which uses the host cell's ribosomes and energy to replicate, making it vulnerable to antibiotics that penetrate cells (tetracyclines, macrolides). The inclusion bodies visible on Giemsa stain (or in cell culture) represent vesicles containing developing organisms.
Why is NGU more common than GU? Chlamydia causes 50% more STI cases than gonorrhea globally; it is often asymptomatic, leading to silent transmission and widespread reservoir in the population. It is NOT detectable by standard Gram stain (no gram-negative diplococci seen on smear in NGU, unlike GU).
Sources: Robbins & Kumar Basic Pathology; Tietz Textbook of Laboratory Medicine 7e

QUICK COMPARISON TABLE - Lab Diagnosis Summary

DiseaseOrganismKey Lab FindingPreferred Test
BVG. vaginalis + anaerobesClue cells; pH >4.5; Whiff+Wet mount + Amsel criteria / Nugent score
Candida vaginitisC. albicansPseudohyphae + budding yeastKOH mount / Pap smear
TrichomoniasisT. vaginalisMotile flagellated protozoaWet mount (immediate); NAAT
Cervicitis (GC)N. gonorrhoeaeIntracellular gram-neg diplococci in PMNsNAAT (gold standard); Culture
Cervicitis (NGU)C. trachomatisInclusion bodies (Giemsa/immunofluorescence)NAAT (gold standard)
Genital wartsHPV 6/11Koilocytes on histology/PapClinical; Colposcopy + aceto-white
MolluscumPoxvirus MCVHenderson-Patterson (molluscum) bodiesClinical; Histology
BartholinitisPolymicrobialCulture (polymicrobial)Clinical + pus culture

MEMORY AIDS

  • BV mnemonic: "CLUE cells + FISHY smell + GRAY discharge + pH >4.5" = BV
  • Chlamydia EB vs RB: "EB = Extracellular, Enters cell"; "RB = Replicates inside"
  • Molluscum: "Pearly + Dimple + Pox" = Henderson-Patterson bodies
  • NGU causes: "Chlamydia is #1, Mycoplasma is #2, Trichomonas #3, Ureaplasma #4, ~50% unknown"
  • Reactive arthritis triad: "Can't see (conjunctivitis) + Can't pee (urethritis) + Can't climb a tree (arthritis)"
  • HPV types: "6, 11 = Warts (six-eleven sounds like heaven = benign)"; "16, 18 = Cancer (sixteen-eighteen = serious age = malignant)"
  • Bartholin anatomy: "Bartholin is at 4 and 8 o'clock positions at the vaginal introitus"
Sources consulted: Sherris & Ryan's Medical Microbiology 8e, Robbins & Kumar Basic Pathology, Robbins Cotran & Kumar Pathologic Basis of Disease, Tietz Textbook of Laboratory Medicine 7e, Goldman-Cecil Medicine, Harrison's Principles of Internal Medicine 22e

can u make pdf with photos too

Reading File
Running Command

ls /tmp/workspace/ 2>/dev/null || mkdir -p /tmp/workspace && echo "workspace ready"

Running Command

mkdir -p /tmp/workspace/genital-tract-infections && cd /tmp/workspace/genital-tract-infections && python3 -c "import reportlab; import PIL; import requests; print('All libs OK')"

Writing File

~/genital-tract-infections/build_pdf.py


import requests
import os
from io import BytesIO
from PIL import Image as PILImage

from reportlab.lib.pagesizes import A4
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.units import cm, mm
from reportlab.lib import colors
from reportlab.platypus import (
    SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle,
    Image, HRFlowable, PageBreak, KeepTogether
)
from reportlab.platypus.flowables import Flowable
from reportlab.lib.enums import TA_CENTER, TA_LEFT, TA_JUSTIFY

OUTPUT = "/tmp/workspace/genital-tract-infections/Genital_Tract_Infections_Apurba_Sastri.pdf"

# ── colour palette ──────────────────────────────────────────────────────────
DARK_BLUE   = colors.HexColor("#1a3a5c")
MID_BLUE    = colors.HexColor("#2563a8")
LIGHT_BLUE  = colors.HexColor("#dbeafe")
ACCENT_RED  = colors.HexColor("#c0392b")
GOLD        = colors.HexColor("#f39c12")
GREEN       = colors.HexColor("#1e8449")
LIGHT_GREEN = colors.HexColor("#d5f5e3")
LIGHT_GREY  = colors.HexColor("#f0f4f8")
WHITE       = colors.white
BLACK       = colors.HexColor("#1a1a1a")
TABLE_HEAD  = colors.HexColor("#1a3a5c")
TABLE_ALT   = colors.HexColor("#eaf0fb")

W, H = A4

# ── styles ───────────────────────────────────────────────────────────────────
styles = getSampleStyleSheet()

def S(name, **kw):
    base = styles["Normal"]
    return ParagraphStyle(name, parent=base, **kw)

title_style   = S("DocTitle",  fontSize=22, textColor=WHITE,      alignment=TA_CENTER, fontName="Helvetica-Bold", spaceAfter=4)
sub_style     = S("DocSub",    fontSize=12, textColor=LIGHT_BLUE, alignment=TA_CENTER, fontName="Helvetica",      spaceAfter=2)
h1_style      = S("H1",        fontSize=15, textColor=WHITE,      fontName="Helvetica-Bold", spaceAfter=4, leading=20)
h2_style      = S("H2",        fontSize=12, textColor=DARK_BLUE,  fontName="Helvetica-Bold", spaceAfter=3, leading=15)
h3_style      = S("H3",        fontSize=10.5, textColor=MID_BLUE, fontName="Helvetica-Bold", spaceAfter=2, leading=14)
body_style    = S("Body",      fontSize=9.5, textColor=BLACK,     fontName="Helvetica",      spaceAfter=3, leading=14, alignment=TA_JUSTIFY)
bullet_style  = S("Bullet",    fontSize=9.5, textColor=BLACK,     fontName="Helvetica",      spaceAfter=2, leading=13, leftIndent=14, bulletIndent=4)
caption_style = S("Caption",   fontSize=8,   textColor=colors.HexColor("#555555"), fontName="Helvetica-Oblique", alignment=TA_CENTER, spaceAfter=6)
must_style    = S("Must",      fontSize=9,   textColor=colors.HexColor("#7b2000"), fontName="Helvetica-Bold",   spaceAfter=2, leading=13)
note_style    = S("Note",      fontSize=8.5, textColor=colors.HexColor("#1a5276"), fontName="Helvetica-Oblique", spaceAfter=2, leading=13)
source_style  = S("Source",    fontSize=7.5, textColor=colors.HexColor("#777777"), fontName="Helvetica-Oblique", alignment=TA_CENTER, spaceAfter=3)

# ── helper: download image ───────────────────────────────────────────────────
def fetch_img(url, max_w, max_h, cache_dir="/tmp/workspace/genital-tract-infections/img_cache"):
    os.makedirs(cache_dir, exist_ok=True)
    fname = os.path.join(cache_dir, url.split("/")[-1][:60] + ".jpg")
    if not os.path.exists(fname):
        try:
            r = requests.get(url, timeout=20)
            img = PILImage.open(BytesIO(r.content)).convert("RGB")
            img.save(fname, "JPEG", quality=85)
        except Exception as e:
            print(f"  [WARN] Could not fetch {url}: {e}")
            return None
    try:
        img = PILImage.open(fname)
        iw, ih = img.size
        scale = min(max_w / iw, max_h / ih, 1.0)
        return Image(fname, width=iw * scale, height=ih * scale)
    except:
        return None

# ── coloured section banner ──────────────────────────────────────────────────
class ColorBanner(Flowable):
    def __init__(self, text, bg=DARK_BLUE, text_color=WHITE, height=28, font_size=13):
        super().__init__()
        self.text = text
        self.bg = bg
        self.text_color = text_color
        self.height = height
        self.font_size = font_size
        self.width = W - 4 * cm

    def draw(self):
        self.canv.setFillColor(self.bg)
        self.canv.roundRect(0, 0, self.width, self.height, 6, fill=1, stroke=0)
        self.canv.setFillColor(self.text_color)
        self.canv.setFont("Helvetica-Bold", self.font_size)
        self.canv.drawString(10, 8, self.text)

def banner(text, bg=DARK_BLUE, font_size=13):
    return [Spacer(1, 4*mm), ColorBanner(text, bg=bg, font_size=font_size), Spacer(1, 3*mm)]

# ── coloured box paragraph ────────────────────────────────────────────────────
def colored_box(paragraphs, bg=LIGHT_BLUE, border=MID_BLUE):
    data = [[p] for p in paragraphs]
    t = Table(data, colWidths=[W - 4*cm - 10])
    t.setStyle(TableStyle([
        ("BACKGROUND",    (0, 0), (-1, -1), bg),
        ("BOX",           (0, 0), (-1, -1), 0.8, border),
        ("TOPPADDING",    (0, 0), (-1, -1), 5),
        ("BOTTOMPADDING", (0, 0), (-1, -1), 5),
        ("LEFTPADDING",   (0, 0), (-1, -1), 8),
        ("RIGHTPADDING",  (0, 0), (-1, -1), 8),
        ("ROWBACKGROUNDS",(0, 0), (-1, -1), [bg]),
    ]))
    return [t, Spacer(1, 3*mm)]

def must_box(items):
    paras = [Paragraph(f"<b>MUST KNOW</b>", must_style)] + \
            [Paragraph(f"• {i}", bullet_style) for i in items]
    return colored_box(paras, bg=colors.HexColor("#fff5f5"), border=ACCENT_RED)

def gtk_box(items):
    paras = [Paragraph(f"<b>GOOD TO KNOW</b>", S("gtk", fontSize=9, textColor=GREEN, fontName="Helvetica-Bold", spaceAfter=2))] + \
            [Paragraph(f"• {i}", bullet_style) for i in items]
    return colored_box(paras, bg=LIGHT_GREEN, border=GREEN)

def concept_box(text):
    paras = [Paragraph("<b>UNDERSTANDING THE CONCEPT</b>", S("con", fontSize=9, textColor=colors.HexColor("#1a5276"), fontName="Helvetica-Bold", spaceAfter=2)),
             Paragraph(text, note_style)]
    return colored_box(paras, bg=colors.HexColor("#eaf4fb"), border=MID_BLUE)

# ── table helper ─────────────────────────────────────────────────────────────
def data_table(headers, rows, col_widths=None):
    data = [headers] + rows
    if col_widths is None:
        col_widths = [(W - 4*cm) / len(headers)] * len(headers)
    t = Table(data, colWidths=col_widths, repeatRows=1)
    style = [
        ("BACKGROUND",    (0, 0), (-1, 0),  TABLE_HEAD),
        ("TEXTCOLOR",     (0, 0), (-1, 0),  WHITE),
        ("FONTNAME",      (0, 0), (-1, 0),  "Helvetica-Bold"),
        ("FONTSIZE",      (0, 0), (-1, 0),  8),
        ("FONTNAME",      (0, 1), (-1, -1), "Helvetica"),
        ("FONTSIZE",      (0, 1), (-1, -1), 7.5),
        ("BACKGROUND",    (0, 1), (-1, -1), WHITE),
        ("ROWBACKGROUNDS",(0, 1), (-1, -1), [WHITE, TABLE_ALT]),
        ("GRID",          (0, 0), (-1, -1), 0.4, colors.HexColor("#bbbbbb")),
        ("TOPPADDING",    (0, 0), (-1, -1), 4),
        ("BOTTOMPADDING", (0, 0), (-1, -1), 4),
        ("LEFTPADDING",   (0, 0), (-1, -1), 5),
        ("RIGHTPADDING",  (0, 0), (-1, -1), 5),
        ("VALIGN",        (0, 0), (-1, -1), "TOP"),
        ("WORDWRAP",      (0, 0), (-1, -1), "LTR"),
    ]
    for i, row in enumerate(rows):
        for j, cell in enumerate(row):
            data[i+1][j] = Paragraph(str(cell), S(f"tc{i}{j}", fontSize=7.5, leading=11))
    for j, h in enumerate(headers):
        data[0][j] = Paragraph(str(h), S(f"th{j}", fontSize=8, fontName="Helvetica-Bold", textColor=WHITE, leading=11))
    t = Table(data, colWidths=col_widths, repeatRows=1)
    t.setStyle(TableStyle(style))
    return [t, Spacer(1, 4*mm)]

# ── cover page ────────────────────────────────────────────────────────────────
def cover_page():
    elems = []
    elems.append(Spacer(1, 3*cm))

    # Title block
    title_data = [
        [Paragraph("GENITAL TRACT INFECTIONS", title_style)],
        [Paragraph("Apurba Sastri Microbiology | Dr. Shreyashi's Lecture Series", sub_style)],
        [Spacer(1, 6*mm)],
        [Paragraph("Must Know • Good to Know • Understanding Concepts", sub_style)],
    ]
    title_table = Table(title_data, colWidths=[W - 4*cm])
    title_table.setStyle(TableStyle([
        ("BACKGROUND",  (0, 0), (-1, -1), DARK_BLUE),
        ("TOPPADDING",  (0, 0), (-1, -1), 10),
        ("BOTTOMPADDING",(0,0), (-1, -1), 10),
        ("LEFTPADDING", (0, 0), (-1, -1), 15),
        ("RIGHTPADDING",(0, 0), (-1, -1), 15),
        ("ROUNDEDCORNERS", (0, 0), (-1, -1), [10, 10, 10, 10]),
    ]))
    elems.append(title_table)
    elems.append(Spacer(1, 8*mm))

    # Topics covered
    topics = [
        "1. Vaginitis (BV, Candidiasis, Trichomoniasis)",
        "2. Bacterial Vaginosis (BV) - Detailed",
        "3. Cervicitis",
        "4. Bartholinitis (Bartholin Gland Abscess)",
        "5. Genital Warts (Condyloma Acuminata / HPV)",
        "6. Molluscum Contagiosum",
        "7. Non-Gonococcal Urethritis (NGU / Chlamydia)",
        "8. Comparative Lab Diagnosis Table",
        "9. Memory Aids & Quick Review",
    ]
    cover_box = [Paragraph("<b>TOPICS COVERED</b>", h2_style)] + \
                [Paragraph(t, bullet_style) for t in topics]
    elems += colored_box(cover_box, bg=LIGHT_BLUE, border=DARK_BLUE)

    elems.append(Spacer(1, 8*mm))
    elems.append(Paragraph(
        "Sources: Sherris & Ryan's Medical Microbiology 8e | Robbins & Kumar Basic Pathology | "
        "Robbins Cotran & Kumar Pathologic Basis of Disease | Tietz Textbook of Laboratory Medicine 7e | "
        "Goldman-Cecil Medicine | Harrison's Principles of Internal Medicine 22e",
        source_style))
    elems.append(PageBreak())
    return elems

# ── image URLs ────────────────────────────────────────────────────────────────
IMG_BV    = "https://cdn.orris.care/cdss_images/pmc_clinical_VQA_c1fa959fcc374c1282fd18b4fc6f2e0999f056e3a4464124d3d2ad884a63e5d7.jpg"
IMG_WARTS = "https://cdn.orris.care/cdss_images/pmc_clinical_VQA_f22a328614c60567db07558682ea89501c602a2c4d80550646855ef6a1040e72.jpg"
IMG_WARTS2= "https://cdn.orris.care/cdss_images/Pathology_1760048447732_4e23fea8-0e9a-4fce-8240-9aa3265760a5.jpg"
IMG_MOL   = "https://cdn.orris.care/cdss_images/DermNetNZ_1760036332003_c7f2f3ed-f769-431e-8214-8558079981c8.jpg"
IMG_CHLAM = "https://cdn.orris.care/cdss_images/pmc_clinical_VQA_edfdac49febd0d5695812492031d93f3ff249227bf971234304df196a5d3e572.jpg"
IMG_MOL2  = "https://cdn.orris.care/cdss_images/DermNetNZ_1760036166077_f138fb39-f0a3-459e-9018-121c00df07a5.jpg"

# ── MAIN BUILD ────────────────────────────────────────────────────────────────
def build():
    doc = SimpleDocTemplate(OUTPUT, pagesize=A4,
                            leftMargin=2*cm, rightMargin=2*cm,
                            topMargin=2*cm, bottomMargin=2*cm)
    story = []

    # ── Cover ─────────────────────────────────────────────────────────────────
    story += cover_page()

    # ═══════════════════════════════════════════════════════════════════════════
    # SECTION 0 - Overview
    # ═══════════════════════════════════════════════════════════════════════════
    story += banner("OVERVIEW — Genital Tract Infections Framework", bg=DARK_BLUE)
    story.append(Paragraph(
        "Genital tract infections affect the lower tract (vulva, vagina, cervix, urethra, Bartholin's gland) "
        "and can ascend to the upper tract (uterus, fallopian tubes, ovaries) causing PID. Normal vaginal pH "
        "is <b>3.8–4.5</b> maintained by <b>Lactobacillus</b> species. When this barrier is disrupted, "
        "pathogens colonise and cause disease.", body_style))
    story += data_table(
        ["Category", "Pathogen", "Disease"],
        [
            ["Bacteria", "Neisseria gonorrhoeae", "Cervicitis, Urethritis, PID, Disseminated GC"],
            ["Bacteria", "Chlamydia trachomatis", "NGU, Cervicitis, PID, LGV, Ophthalmia neonatorum"],
            ["Bacteria", "Gardnerella vaginalis + anaerobes", "Bacterial Vaginosis"],
            ["Bacteria", "Polymicrobial", "Bartholinitis / Bartholin gland abscess"],
            ["Virus", "HPV 6/11 (low-risk)", "Condyloma acuminata (Genital warts)"],
            ["Virus", "HPV 16/18 (high-risk)", "Cervical dysplasia → carcinoma"],
            ["Virus", "Poxvirus (MCV)", "Molluscum contagiosum"],
            ["Protozoan", "Trichomonas vaginalis", "Trichomoniasis / Vaginitis"],
            ["Fungus", "Candida albicans", "Vulvovaginal candidiasis"],
        ],
        col_widths=[3*cm, 6.5*cm, 7*cm]
    )
    story.append(PageBreak())

    # ═══════════════════════════════════════════════════════════════════════════
    # SECTION 1 - Vaginitis Comparison
    # ═══════════════════════════════════════════════════════════════════════════
    story += banner("1. VAGINITIS — Three Causes Compared", bg=MID_BLUE)
    story += data_table(
        ["Feature", "Bacterial Vaginosis", "Candidiasis", "Trichomoniasis"],
        [
            ["Cause", "G. vaginalis + anaerobes", "Candida albicans", "Trichomonas vaginalis"],
            ["Discharge", "Thin, gray-white, homogeneous", "Thick, white, 'curd-like'", "Yellow, frothy, foul-smelling"],
            ["pH", ">4.5", "<4.5 (normal)", ">4.5"],
            ["Wet Mount", "Clue cells", "Pseudohyphae + budding yeast", "Motile flagellated trophozoites"],
            ["KOH/Whiff Test", "POSITIVE (fishy amine odor)", "Pseudohyphae visible", "Not used"],
            ["Itch/Pruritis", "Mild/absent", "Severe pruritis + erythema", "Present"],
            ["Cervix", "Normal", "Erythematous", "Strawberry cervix"],
            ["STI?", "No (dysbiosis)", "No", "Yes"],
            ["Treatment", "Metronidazole", "Fluconazole / Clotrimazole", "Metronidazole"],
        ],
        col_widths=[3*cm, 4.5*cm, 4.5*cm, 4.5*cm]
    )

    # BV image
    img_bv = fetch_img(IMG_BV, max_w=13*cm, max_h=7*cm)
    if img_bv:
        story.append(KeepTogether([
            img_bv,
            Paragraph("BV (Panel C): clue cells — epithelial cells coated with coccobacilli. "
                      "Normal (Panel D): Lactobacillus-dominant flora with clear cells.", caption_style),
            Spacer(1, 3*mm)
        ]))

    story += must_box([
        "Amsel criteria for BV (3 of 4 required): homogeneous discharge, pH >4.5, clue cells on wet mount, positive whiff test",
        "Clue cell = vaginal epithelial cell studded/coated with G. vaginalis coccobacilli — shaggy, stippled border",
        "Whiff test: 10% KOH added to discharge → fishy odor from volatilised amines = POSITIVE in BV",
        "Trichomoniasis: ONLY sexually transmitted vaginitis — causes strawberry cervix",
        "Nugent score: Gram stain scoring of vaginal flora (0-10); ≥7 = BV",
    ])
    story += gtk_box([
        "Trichomoniasis in pregnancy → premature rupture of membranes + preterm birth",
        "BV in pregnancy → associated with premature labour and postpartum endometritis",
        "BV increases susceptibility to HIV by disrupting mucosal barrier",
        "T. vaginalis is the most prevalent non-viral STI worldwide (~3.7 million in US alone)",
        "Only 30% of T. vaginalis infected people develop symptoms — most are asymptomatic carriers",
        "Candida is NOT an STI — it is a disruption of normal flora; triggered by antibiotics, diabetes, pregnancy, immunosuppression",
    ])
    story += concept_box(
        "Normal vaginal pH <4.5 is maintained by Lactobacillus which produces lactic acid and H2O2. In BV, a "
        "POLYMICROBIAL DYSBIOSIS occurs — not an infection by a single new pathogen. Lactobacillus is depleted, "
        "anaerobes overgrow, pH rises, and amines (putrescine, cadaverine) produced by anaerobes give the fishy smell. "
        "KOH volatilises these amines, making the whiff test positive. Clue cells represent G. vaginalis adherence "
        "to epithelial surface via fimbriae, masking the normal cell border."
    )
    story.append(PageBreak())

    # ═══════════════════════════════════════════════════════════════════════════
    # SECTION 2 - Bacterial Vaginosis
    # ═══════════════════════════════════════════════════════════════════════════
    story += banner("2. BACTERIAL VAGINOSIS (BV) — In Detail", bg=MID_BLUE)
    story.append(Paragraph(
        "BV is the most common vaginal condition in women of reproductive age. It is a <b>polymicrobial dysbiosis</b>, "
        "not a classical infection. The dominant feature is uncomfortable vaginal discharge with a 'fishy' odor.", body_style))
    story += must_box([
        "Causative organisms: Gardnerella vaginalis (primary) + Mobiluncus, Prevotella, Peptostreptococcus (anaerobes)",
        "Gram stain: Clue cells = epithelial cells coated with gram-variable coccobacilli",
        "Whiff test (Amine test): 10% KOH to discharge → fishy odor POSITIVE",
        "Amsel criteria: 3 of 4 — (i) homogeneous discharge, (ii) pH >4.5, (iii) clue cells, (iv) +ve whiff",
        "Nugent score: 0–3 normal; 4–6 intermediate; 7–10 = BV",
        "Treatment: Metronidazole 500 mg BD x 7 days (oral) OR metronidazole vaginal gel 0.75%",
    ])
    story += gtk_box([
        "BV + pregnancy → premature labour, PPROM, postpartum endometritis",
        "BV increases risk of acquiring gonorrhea, chlamydia, HIV",
        "G. vaginalis forms a dense BIOFILM on vaginal epithelium — this explains high recurrence rates (50% in 1 year)",
        "Attachment of N. gonorrhoeae to cervix is ENHANCED by enzymes from BV microbiota (unmasks receptor)",
        "Recurrent BV: consider treatment of partner, prolonged metronidazole, boric acid suppositories",
    ])
    story += concept_box(
        "Why does BV smell fishy? Anaerobic bacteria in BV metabolise proteins to produce AMINES (putrescine, "
        "cadaverine, trimethylamine). These amines are non-volatile at normal vaginal pH but become volatile (gaseous) "
        "when KOH raises the pH — this is the basis of the WHIFF TEST. The 'clue cell' is formed when G. vaginalis "
        "adheres so densely to the epithelial surface that the cell's sharp, clear border is completely obscured by "
        "the bacterial coating — giving it a 'stippled' or 'shaggy' appearance on wet mount."
    )
    story.append(PageBreak())

    # ═══════════════════════════════════════════════════════════════════════════
    # SECTION 3 - Cervicitis
    # ═══════════════════════════════════════════════════════════════════════════
    story += banner("3. CERVICITIS", bg=DARK_BLUE)
    story.append(Paragraph(
        "Cervicitis is inflammation of the cervix. It is the <b>gateway infection to PID</b>. The two most important "
        "causative organisms are <b>Neisseria gonorrhoeae</b> and <b>Chlamydia trachomatis</b>.", body_style))
    story += must_box([
        "Primary causes: Chlamydia trachomatis (most common) + Neisseria gonorrhoeae",
        "Emerging cause: Mycoplasma genitalium (up to 30% recurrent cervicitis/urethritis in males)",
        "Symptoms: mucopurulent discharge, intermenstrual bleeding, pelvic pain, dyspareunia",
        "Gold Standard Diagnosis: NAAT (Nucleic Acid Amplification Test) — on genital swab or urine",
        "Gonococcal cervicitis Gram stain: intracellular gram-negative diplococci INSIDE neutrophils",
        "Most important complication: Pelvic Inflammatory Disease (PID) → infertility, ectopic pregnancy",
    ])
    story += gtk_box([
        "MOST cervicitis is asymptomatic: Only 6% of Chlamydia-infected females and 14% with gonorrhea have signs",
        "Gonorrhea and Chlamydia co-infection is common — always treat BOTH simultaneously (dual therapy)",
        "Disseminated gonococcal infection (DGI): septic arthritis (knees), tenosynovitis, fever, vesicular skin lesions",
        "Fitz-Hugh-Curtis syndrome: perihepatitis from Chlamydia/GC spreading to perihepatic capsule → RUQ pain",
        "Chlamydia is the MOST COMMON bacterial STI worldwide",
        "Culture: needed for GC antibiotic sensitivity testing; less sensitive than NAAT; takes ~48 hours",
    ])
    story += concept_box(
        "GONOCOCCAL PID spreads upward along mucosal surfaces (cervix → endocervix → fallopian tubes), causing "
        "ACUTE SUPPURATIVE SALPINGITIS with neutrophil infiltration and pus filling the tube. The endometrium is "
        "characteristically SPARED in gonorrhea (reason unclear). NON-GONOCOCCAL (Chlamydial) PID spreads through "
        "lymphatics/venous channels — causing deeper tissue inflammation. This explains why chlamydial PID tends to "
        "cause more silent scarring and tubal factor infertility despite fewer acute symptoms."
    )
    story.append(PageBreak())

    # ═══════════════════════════════════════════════════════════════════════════
    # SECTION 4 - Bartholinitis
    # ═══════════════════════════════════════════════════════════════════════════
    story += banner("4. BARTHOLINITIS (Bartholin Gland Infection / Abscess)", bg=DARK_BLUE)
    story.append(Paragraph(
        "Bartholin glands are paired mucus-secreting glands located at the <b>4 o'clock and 8 o'clock</b> positions "
        "at the vaginal introitus. They lubricate the vagina during intercourse. Blockage of the duct → cyst; "
        "infection of a cyst or gland → abscess.", body_style))
    story += must_box([
        "Location: 4 o'clock and 8 o'clock at the vaginal introitus (posterior labia minora)",
        "Organisms: POLYMICROBIAL — E. coli, Staphylococcus, Streptococci; also N. gonorrhoeae, C. trachomatis",
        "Presentation: Unilateral painful vulvar swelling, fluctuant mass, erythema, difficulty walking/sitting",
        "Bartholin cyst = duct obstruction (no infection) → painless or mildly painful",
        "Bartholin abscess = infected cyst → severely painful, fever, tender",
        "Treatment: Abscess → I&D + Word catheter (for drainage and epithelialisation)",
        "Recurrent: Marsupialization (surgical creation of permanent opening)",
        "Women >40 with 'recurrent bartholinitis': ALWAYS BIOPSY to exclude Bartholin gland carcinoma",
    ])
    story += gtk_box([
        "Word catheter: small balloon catheter placed in the abscess cavity; kept in place for 4–6 weeks to allow "
        "new epithelialised tract to form, preventing reaccumulation",
        "Marsupialization: suturing the walls of the cyst to the labial skin to create a permanent drainage opening",
        "Bartholin gland carcinoma: rare; most common initial symptom = vulvar mass or perineal pain; "
        "10% have history of prior Bartholin gland inflammation",
        "Bartholin abscess is one of the most common vulvar emergencies in gynecology OPD",
    ])
    story += concept_box(
        "The Bartholin gland drains via a 2 cm duct that opens just lateral to the hymen. When this duct is blocked "
        "(by mucus plug, inflammation, squamous cell proliferation), secretions accumulate forming a CYST. Bacterial "
        "superinfection — most commonly by gut/skin flora (E. coli, Staphylococcus) or STI pathogens — converts it to "
        "a painful ABSCESS. The gland sits in loose areolar tissue with a rich vascular supply, allowing rapid spread. "
        "Word catheter drainage + epithelialisation creates a new permanent channel, preventing recurrence."
    )
    story.append(PageBreak())

    # ═══════════════════════════════════════════════════════════════════════════
    # SECTION 5 - Genital Warts (HPV)
    # ═══════════════════════════════════════════════════════════════════════════
    story += banner("5. GENITAL WARTS (Condyloma Acuminata) — HPV", bg=colors.HexColor("#7d3c98"))
    story.append(Paragraph(
        "Condyloma acuminata are benign genital warts caused by low-risk HPV types. HPV is the "
        "<b>most common STI globally</b>. The same virus family causes both benign warts (low-risk HPV) "
        "and cervical cancer (high-risk HPV).", body_style))

    # Images side by side
    img_w1 = fetch_img(IMG_WARTS, max_w=7.5*cm, max_h=6*cm)
    img_w2 = fetch_img(IMG_WARTS2, max_w=7.5*cm, max_h=6*cm)
    if img_w1 and img_w2:
        img_row = Table([[img_w1, img_w2]], colWidths=[8*cm, 8.5*cm])
        img_row.setStyle(TableStyle([("ALIGN", (0,0), (-1,-1), "CENTER")]))
        story.append(img_row)
        story.append(Paragraph(
            "Left: Extensive cauliflower-like vulvar condyloma acuminata. "
            "Right: Penile shaft genital warts — raised, flesh-colored papules (HPV 6/11).",
            caption_style))
        story.append(Spacer(1, 3*mm))

    story += must_box([
        "Cause: HPV types 6 and 11 (LOW-RISK — cause warts, NOT cancer)",
        "HIGH-RISK HPV types: 16, 18, 31, 33 → cervical dysplasia (CIN) → cervical cancer",
        "Appearance: Fleshy, exophytic, CAULIFLOWER-LIKE verrucous papules on genitals, perineum, perianal",
        "Histology KEY FINDING: KOILOCYTES = epithelial cells with pyknotic/raisinoid nuclei + perinuclear clear halo",
        "Vertical transmission: HPV passed during delivery → LARYNGEAL PAPILLOMATOSIS in newborn",
        "Diagnosis: Clinical appearance; Pap smear + colposcopy for cervical HPV",
        "Aceto-white test: 5% acetic acid turns HPV lesions white on colposcopy",
        "Treatment: Podophyllin, Podophyllotoxin, Imiquimod, TCA, Cryotherapy, Laser, Surgery",
        "Prevention: Gardasil-9 vaccine (HPV 6, 11, 16, 18, 31, 33, 45, 52, 58)",
    ])
    story += gtk_box([
        "Condylomata ACUMINATA (pointed warts) vs Condylomata LATA of secondary syphilis (FLAT, broad-based warts)",
        "HPV 16/18 integration into host genome → inactivates p53 AND Rb tumour suppressors → malignant transformation",
        "Cervical cancer: HPV is responsible for ~99.7% of all cases — it is the most preventable cancer via vaccination",
        "Recurrence of warts is common as HPV persists latently in basal keratinocytes",
        "Immunosuppression (HIV, transplant): warts are larger, more extensive, respond poorly to treatment",
    ])
    story += concept_box(
        "HPV infects the BASAL LAYER of stratified squamous epithelium through micro-abrasions during sexual contact. "
        "LOW-RISK HPV types (6/11) remain EPISOMAL (circular DNA outside nucleus) and cause proliferative but benign "
        "warts — they produce proteins that stimulate epithelial growth without genome integration. HIGH-RISK types "
        "(16/18) can INTEGRATE into host genome, causing production of viral oncoproteins E6 (degrades p53) and "
        "E7 (inactivates Rb retinoblastoma protein). Loss of these tumour suppressors removes normal cell cycle "
        "checkpoints → uncontrolled proliferation → dysplasia → invasive carcinoma. Koilocytes represent the "
        "cytopathic effect of HPV: viral proteins disrupt keratin filaments and cause perinuclear vacuolisation."
    )
    story.append(PageBreak())

    # ═══════════════════════════════════════════════════════════════════════════
    # SECTION 6 - Molluscum Contagiosum
    # ═══════════════════════════════════════════════════════════════════════════
    story += banner("6. MOLLUSCUM CONTAGIOSUM", bg=colors.HexColor("#1a6644"))
    story.append(Paragraph(
        "Molluscum contagiosum is a <b>poxvirus infection</b> causing characteristic pearly, dome-shaped papules "
        "with central umbilication. The appearance is pathognomonic.", body_style))

    img_m1 = fetch_img(IMG_MOL, max_w=7.5*cm, max_h=5.5*cm)
    img_m2 = fetch_img(IMG_MOL2, max_w=7.5*cm, max_h=5.5*cm)
    if img_m1 and img_m2:
        img_row = Table([[img_m1, img_m2]], colWidths=[8*cm, 8.5*cm])
        img_row.setStyle(TableStyle([("ALIGN", (0,0), (-1,-1), "CENTER")]))
        story.append(img_row)
        story.append(Paragraph(
            "Classic molluscum contagiosum: multiple dome-shaped, flesh-colored papules with central umbilication (dimple). "
            "Right: lesions on forearm with surrounding dermatitis from secondary irritation.",
            caption_style))
        story.append(Spacer(1, 3*mm))

    story += must_box([
        "Cause: Molluscum Contagiosum Virus (MCV) — a POXVIRUS (large DNA virus)",
        "4 types: MCV-1 (most common overall), MCV-2 (most commonly sexually transmitted)",
        "Appearance: Pearly, dome-shaped papules (1–5 mm), with CENTRAL UMBILICATION (dimple) — PATHOGNOMONIC",
        "Histology: HENDERSON-PATTERSON BODIES = large eosinophilic intracytoplasmic inclusions in keratinocytes",
        "Incubation period: ~6 weeks (range 2 weeks – 6 months)",
        "Transmission — Children: direct contact / fomites (towels); Adults: sexual transmission",
        "Location — Children: trunk, arms, legs; Adults (STI): genitals, lower abdomen, inner thighs, buttocks",
        "Self-limiting: resolves in 6–12 months in immunocompetent patients",
        "Diagnosis: CLINICAL (characteristic appearance alone is diagnostic)",
    ])
    story += gtk_box([
        "HIV/Immunosuppressed patients: lesions are GIANT (>1 cm), numerous (>100), persistent, atypical — especially face",
        "Treatment when needed: curettage, cryotherapy, cantharidin (vesicant), imiquimod, laser ablation",
        "Differential: verruca vulgaris (HPV warts — rough, no umbilication), milia (no umbilication), folliculitis",
        "Molluscum is NOT a notifiable STI in most countries, but is classified as an STI in adults",
        "The 'waxy core' can be expressed from the central dimple — contains Henderson-Patterson body-laden cells",
    ])
    story += concept_box(
        "The characteristic CENTRAL UMBILICATION (dimple) in molluscum is caused by massive accumulation of "
        "HENDERSON-PATTERSON BODIES (intracytoplasmic poxvirus inclusion bodies) inside keratinocytes. These "
        "inclusions become so large they displace the nucleus to the periphery, distend the cell, and eventually cause "
        "central epidermal breakdown — creating the visible dimple. In immunocompromised patients (HIV CD4 <100), "
        "the failure of T-cell-mediated immunity to recognise and destroy infected cells explains the uncontrolled "
        "viral proliferation, resulting in giant, disfiguring, confluent lesions."
    )
    story.append(PageBreak())

    # ═══════════════════════════════════════════════════════════════════════════
    # SECTION 7 - NGU / Chlamydia
    # ═══════════════════════════════════════════════════════════════════════════
    story += banner("7. NON-GONOCOCCAL URETHRITIS (NGU) — Chlamydia trachomatis", bg=ACCENT_RED)
    story.append(Paragraph(
        "NGU is urethritis NOT caused by Neisseria gonorrhoeae. <b>Chlamydia trachomatis</b> is the most common "
        "bacterial STI worldwide and the leading cause of NGU. It is an <b>obligate intracellular pathogen</b> "
        "with a unique biphasic life cycle.", body_style))

    img_ch = fetch_img(IMG_CHLAM, max_w=13*cm, max_h=7*cm)
    if img_ch:
        story.append(KeepTogether([
            img_ch,
            Paragraph(
                "Chlamydia trachomatis biphasic developmental cycle: EB (Elementary Body) = infectious form; "
                "RB (Reticulate Body) = intracellular replicating form. EB → RB → new EBs → cell lysis/extrusion.",
                caption_style),
            Spacer(1, 3*mm)
        ]))

    story += must_box([
        "Most common cause of NGU: Chlamydia trachomatis (serovars D–K) — most common bacterial STI worldwide",
        "2nd cause: Mycoplasma genitalium (up to 30% recurrent NGU males)",
        "Other causes: Trichomonas vaginalis, Ureaplasma urealyticum, HSV; ~50% no pathogen found",
        "CHLAMYDIA LIFE CYCLE — MUST MEMORISE:",
        "  Elementary Body (EB): INFECTIOUS form, metabolically INERT, survives extracellularly, enters cell via receptor-mediated endocytosis",
        "  Reticulate Body (RB): NON-INFECTIOUS, metabolically ACTIVE, replicates using host cell energy (ATP parasite)",
        "  EB → RB (inside phagosome) → RB replicates (binary fission) → RB → EB (secondary differentiation) → cell lysis → new EBs released",
        "Obligate intracellular: CANNOT produce own ATP; uses host cell ribosomes and energy",
        "Tropism: Columnar epithelial cells (cervix, urethra, conjunctiva, fallopian tube, rectum)",
        "Gold Standard diagnosis: NAAT on genital swab or urine",
    ])
    story += gtk_box([
        "NEONATAL CHLAMYDIA (vertical transmission during vaginal delivery):",
        "  - Ophthalmia neonatorum (conjunctivitis) — most common; appears 5–14 days after birth",
        "  - Neonatal pneumonia — appears 4–12 weeks after birth; afebrile, staccato cough",
        "REACTIVE ARTHRITIS (Reiter's syndrome): Urethritis + Arthritis + Conjunctivitis ('Can't pee, can't see, can't climb a tree')",
        "Fitz-Hugh-Curtis syndrome: perihepatitis from C. trachomatis (or GC) spreading via peritoneum to liver capsule → RUQ pain",
        "LGV (Lymphogranuloma Venereum): caused by C. trachomatis serovars L1-3; causes genital ulcer + inguinal lymphadenopathy (buboes) + proctitis",
        "Chlamydia culture: requires live cell culture (McCoy cells); impractical for routine diagnosis",
        "Cannot be seen on standard Gram stain (unlike gonorrhea — hence 'NON-gonococcal')",
        "Giemsa stain or Immunofluorescence can demonstrate inclusion bodies in cell culture",
        "Treatment: Doxycycline 100 mg BD x 7 days OR Azithromycin 1 g single dose; treat partner concurrently",
    ])
    story += concept_box(
        "Chlamydia is classified as an OBLIGATE INTRACELLULAR pathogen because it cannot synthesise its own ATP — "
        "it is an 'energy parasite' that hijacks the host cell's mitochondrial ATP. The EB is the 'survival capsule' — "
        "small, dense, metabolically inert (like a spore), able to survive in the extracellular environment long enough "
        "for transmission. Once inside a host columnar epithelial cell (via receptor-mediated endocytosis), it escapes "
        "lysosomal fusion (a key virulence mechanism) and differentiates into the RB. The RB is large, metabolically "
        "active, replicates by binary fission, and uses the host's ribosomes and energy. After ~24-72 hours, RBs "
        "re-condense back into EBs, which burst out of the cell (lysis) or are extruded, infecting new cells. "
        "This entire cycle takes place within a PHAGOSOME/INCLUSION VESICLE visible on Giemsa as dark inclusion bodies."
    )
    story.append(PageBreak())

    # ═══════════════════════════════════════════════════════════════════════════
    # SECTION 8 - Comparative Lab Table
    # ═══════════════════════════════════════════════════════════════════════════
    story += banner("8. COMPARATIVE LABORATORY DIAGNOSIS", bg=DARK_BLUE)
    story += data_table(
        ["Disease", "Organism", "Key Smear/Lab Finding", "Preferred Test", "Treatment"],
        [
            ["BV", "G. vaginalis + anaerobes", "Clue cells; pH >4.5; Whiff +ve", "Wet mount + Amsel/Nugent criteria", "Metronidazole"],
            ["Candida vaginitis", "Candida albicans", "Pseudohyphae + budding yeast on KOH", "KOH mount / Pap smear / Culture", "Fluconazole / Clotrimazole"],
            ["Trichomoniasis", "T. vaginalis", "Motile pear-shaped flagellated protozoa on wet mount", "Wet mount (immediate!); NAAT", "Metronidazole"],
            ["GC Cervicitis/Urethritis", "N. gonorrhoeae", "Intracellular Gram-neg diplococci in PMNs", "NAAT (gold standard); Culture for sensitivity", "Ceftriaxone + Azithromycin"],
            ["NGU/Cervicitis", "C. trachomatis", "Inclusion bodies (Giemsa, IF); NAAT positive", "NAAT on swab or urine", "Doxycycline / Azithromycin"],
            ["Genital Warts", "HPV 6/11", "Koilocytes on biopsy/Pap smear", "Clinical; Colposcopy + aceto-white", "Podophyllin, Imiquimod, Cryotherapy"],
            ["Molluscum Contagiosum", "Poxvirus MCV", "Henderson-Patterson bodies on histology", "Clinical (umbilicated papule)", "Curettage, Cryotherapy, Cantharidin"],
            ["Bartholinitis/Abscess", "Polymicrobial", "Pus culture (mixed flora, GC/Chlamydia)", "Clinical + culture of pus", "I&D + Word catheter; Marsupialization"],
        ],
        col_widths=[3*cm, 3.5*cm, 4*cm, 3.5*cm, 2.5*cm]
    )
    story.append(PageBreak())

    # ═══════════════════════════════════════════════════════════════════════════
    # SECTION 9 - Memory Aids
    # ═══════════════════════════════════════════════════════════════════════════
    story += banner("9. MEMORY AIDS & QUICK REVIEW", bg=GOLD)
    mem_data = [
        ["BV Diagnosis",
         "CLUE cells + FISHY smell + GRAY discharge + pH >4.5 = BV\nAmsel 3/4: discharge + pH>4.5 + clue cells + whiff+"],
        ["Chlamydia lifecycle",
         "EB = Extracellular, Enters cell (infectious, inert)\nRB = Replicates inside (non-infectious, active)"],
        ["Molluscum",
         "Pearly + DIMPLE + Pox virus = Henderson-Patterson bodies\nMCV-1 most common; MCV-2 = sexually transmitted"],
        ["NGU causes rank",
         "Chlamydia #1 → Mycoplasma #2 → Trichomonas #3 → Ureaplasma #4 → ~50% unknown"],
        ["Reactive arthritis",
         "'Can't see (conjunctivitis) + Can't pee (urethritis) + Can't climb a tree (arthritis)'"],
        ["HPV types",
         "6, 11 = Warts (benign, episomal DNA)\n16, 18 = Cancer (integrate genome, inactivate p53 + Rb)"],
        ["Bartholin anatomy",
         "4 o'clock and 8 o'clock positions at vaginal introitus\nWord catheter → Marsupialization → Excision (if >40: biopsy)"],
        ["Strawberry cervix",
         "Trichomonas vaginalis — dilated mucosal vessels → red spots on colposcopy"],
        ["Vertical Chlamydia",
         "Mother → baby during birth: Ophthalmia neonatorum (5-14 days) then Pneumonia (4-12 wks)"],
        ["Neonatal conjunctivitis",
         "Chlamydia: appears days 5-14; Gonorrhea: appears days 2-5 (earlier) — both treated with antibiotics"],
    ]
    for row in mem_data:
        t = Table([[
            Paragraph(row[0], S("mk", fontSize=9, fontName="Helvetica-Bold", textColor=DARK_BLUE, leading=12)),
            Paragraph(row[1].replace("\n", "<br/>"), S("mv", fontSize=9, fontName="Helvetica", textColor=BLACK, leading=13))
        ]], colWidths=[4*cm, 12.5*cm])
        t.setStyle(TableStyle([
            ("BACKGROUND",  (0,0), (0,0), LIGHT_BLUE),
            ("BACKGROUND",  (1,0), (1,0), WHITE),
            ("BOX",         (0,0), (-1,-1), 0.5, colors.HexColor("#aaaaaa")),
            ("TOPPADDING",  (0,0), (-1,-1), 5),
            ("BOTTOMPADDING",(0,0),(-1,-1), 5),
            ("LEFTPADDING", (0,0), (-1,-1), 6),
        ]))
        story.append(t)
        story.append(Spacer(1, 1.5*mm))

    story.append(Spacer(1, 8*mm))
    story.append(HRFlowable(width="100%", thickness=1, color=DARK_BLUE))
    story.append(Spacer(1, 3*mm))
    story.append(Paragraph(
        "Sources: Sherris & Ryan's Medical Microbiology 8e | Robbins & Kumar Basic Pathology | "
        "Robbins Cotran & Kumar Pathologic Basis of Disease | Tietz Textbook of Laboratory Medicine 7e | "
        "Goldman-Cecil Medicine | Harrison's Principles of Internal Medicine 22e",
        source_style))

    doc.build(story)
    print(f"PDF created: {OUTPUT}")

if __name__ == "__main__":
    build()
Running Command

cd /tmp/workspace/genital-tract-infections && python3 build_pdf.py 2>&1

Running Command

ls -lh /tmp/workspace/genital-tract-infections/Genital_Tract_Infections_Apurba_Sastri.pdf

Your PDF is ready (525 KB, 9 sections, fully illustrated):

Genital Tract Infections Apurba Sastri

PDF Document · PDF

What's inside the PDF:
SectionContent
Cover pageTopic list + all 7 subjects covered
Overview tableAll pathogens, diseases, categories
1. VaginitisBV vs Candida vs Trichomonas comparison table + BV/clue cells photo
2. Bacterial VaginosisAmsel criteria, Nugent score, whiff test, biofilm concept
3. CervicitisGC vs Chlamydia, NAAT, PID pathway
4. BartholinitisAnatomy, Word catheter, marsupialization, carcinoma
5. Genital Warts (HPV)Two clinical photos of condyloma + koilocytes, HPV types, vaccine
6. Molluscum ContagiosumTwo photos of dome-shaped papules + Henderson-Patterson bodies
7. NGU / ChlamydiaLife cycle diagram photo (EB → RB → EB) + neonatal, LGV, reactive arthritis
8. Lab Diagnosis TableAll 8 conditions: organism, smear finding, test, treatment
9. Memory Aids10 mnemonics + quick recall boxes
Every section has colour-coded Must Know, Good to Know, and Understanding the Concept boxes.
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