## HIV Transmission Modes in India **Key Point:** Heterosexual transmission accounts for approximately 87–88% of all HIV infections in India, making it the predominant mode of transmission in the general population. ### Epidemiological Context India's HIV epidemic is characterized by: - **Concentrated epidemics** in key populations (MSM, sex workers, PWID) - **Generalized spread** through heterosexual contact in the general population - Prevalence in India: ~2.3 million PLHIV (2021 estimates) ### Relative Contribution of Transmission Routes | Transmission Route | Estimated % of New Infections | Population Affected | | --- | --- | --- | | Heterosexual contact | 87–88% | General population, spouses | | MSM | 5–7% | Key population | | PWID (IV drug use) | 2–3% | Key population, Northeast India | | Mother-to-child | 1–2% | Infants, children | | Blood transfusion | <1% | Rare, improved screening | **High-Yield:** The shift from a key-population-driven epidemic to a heterosexual-driven epidemic is the defining feature of India's HIV epidemiology. This explains why prevention messaging targets couples and married individuals. ### Clinical Pearl In India, the **spouse of an HIV-positive person** is at high risk — many women acquire HIV through their husbands. This has led to emphasis on: - Couple counselling and testing - Condom promotion in stable relationships - Prevention of parent-to-child transmission (PMTCT) programs **Warning:** Do not confuse India's epidemiology with that of sub-Saharan Africa (where heterosexual transmission is even higher) or Western countries (where MSM and PWID remain significant contributors). India's profile is unique and exam-specific.
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