Student Memory Support
Topic 11 — Sexually Transmitted Infections
4th Year MBBS • Renal Module • High-yield memory reinforcement and last-minute revision
1. High-Yield Flashcards
Tap each question to reveal the answer.
Which immune cell is progressively depleted in untreated HIV infection?
CD4-positive T lymphocyte.
What is the main treatment principle in HIV infection?
Combination antiretroviral therapy to suppress viral replication.
Which laboratory measure mainly reflects immune status after HIV diagnosis?
CD4-cell count.
Which organism causes syphilis?
Treponema pallidum.
What is the classic lesion of primary syphilis?
A painless, indurated chancre.
Which rash distribution is an important clue to secondary syphilis?
Involvement of the palms and soles.
Which drug remains the treatment of choice for syphilis?
Penicillin.
Which organism causes gonorrhea?
Neisseria gonorrhoeae.
Which diagnostic method is widely used for genital gonorrhea and chlamydia?
Nucleic-acid amplification testing.
Why is asymptomatic chlamydial infection clinically important?
It may ascend and cause pelvic inflammatory disease and tubal damage.
Which HPV types are strongly associated with genital warts?
HPV types 6 and 11.
Which HPV types are especially important in cervical carcinogenesis?
High-risk HPV types, particularly 16 and 18.
Why can genital warts recur after apparently successful treatment?
Visible lesions may be removed while underlying HPV infection persists.
What is the main purpose of cervical HPV-related screening?
To detect high-risk HPV infection or precancerous epithelial change before invasive cancer develops.
Why is partner management important in STI control?
It reduces reinfection and helps interrupt further community transmission.
2. Mnemonics
Mnemonic Title: STI Control Sequence
P-T-T-P
Meaning: Prevention → Testing → Treatment → Partner management.
Mnemonic Title: Syphilis Progression
P-S-L-L
Meaning: Primary → Secondary → Latent → Late disease.
Mnemonic Title: HPV Risk Split
6/11 = Warts; 16/18 = High Risk
Meaning: HPV 6 and 11 are linked to genital warts; 16 and 18 are major oncogenic types.
3. Memory Tables
Syphilis Stages — Rapid Differentiation
| Stage | Main Clue | Memory Point |
|---|---|---|
| Primary | Painless indurated chancre | Local inoculation lesion |
| Secondary | Systemic rash; palms and soles | Disseminated disease |
| Latent | Positive serology, no symptoms | Clinically silent infection |
| Late | Neurological, cardiovascular or gummatous disease | Chronic complications |
Low-Risk vs High-Risk HPV
| Feature | Low-Risk HPV | High-Risk HPV |
|---|---|---|
| Important types | 6, 11 | 16, 18 and other oncogenic types |
| Main outcome | Genital warts | Epithelial dysplasia and cancer risk |
| Prevention focus | Vaccination and exposure reduction | Vaccination plus cervical screening |
4. Rapid Revision Points — Last-Minute Revision
Must Remember:
- HIV infects CD4-positive cells and progressively impairs cell-mediated immunity.
- Combination ART suppresses HIV replication and reduces onward transmission when viral suppression is sustained.
- Primary syphilis classically presents with a painless indurated chancre.
- Secondary syphilis may produce a generalized rash involving the palms and soles.
- Penicillin remains the principal treatment for syphilis.
- Gonorrhea commonly causes purulent urethritis; cervical disease may remain clinically silent.
- Chlamydial infection may be asymptomatic yet ascend and cause pelvic inflammatory disease and tubal injury.
- NAAT is widely used for detecting genital gonococcal and chlamydial infection.
- Low-risk HPV is linked to genital warts, whereas persistent high-risk HPV is linked to dysplasia and malignancy.
- Effective STI control combines prevention, testing, treatment and partner management.
Common KMU Trap: Condylomata acuminata are HPV-related genital warts; condylomata lata occur in secondary syphilis.
5. Clinical Memory Hooks
High-risk sexual exposure with early febrile illness → consider early HIV infection, where antigen or nucleic-acid detection may be important.
Painless genital ulcer followed later by systemic rash → primary syphilis progressing to secondary dissemination.
Purulent urethral discharge with dysuria → gonococcal urethritis; confirm with appropriate laboratory testing.
Asymptomatic cervical infection in a young woman → think chlamydia; silent ascending infection can damage the fallopian tubes.
6. Starred High-Yield Exam Points
- ⭐ HIV → progressive CD4-cell loss → cellular immunodeficiency; combination ART suppresses viral replication.
- ⭐ Primary syphilis → painless indurated chancre; secondary syphilis → palm-and-sole rash.
- ⭐ Penicillin remains the key treatment for syphilis.
- ⭐ NAAT is a major diagnostic method for gonorrhea and chlamydial infection at the appropriate anatomical site.
- ⭐ HPV 6/11 → genital warts; persistent high-risk HPV 16/18 → cervical dysplasia and malignancy risk.
- ⭐ Prevention + testing + treatment + partner management → reduced reinfection and STI transmission.