Prevention of AIDS — Core Principles
Core Principles
Preventing AIDS fundamentally means preventing HIV infection. HIV is transmitted through specific bodily fluids: blood, semen, pre-ejaculate, rectal fluids, vaginal fluids, and breast milk. The main routes are unprotected sexual contact, sharing contaminated needles, and mother-to-child transmission.
Key prevention strategies include consistent and correct use of condoms, ensuring blood safety through screening, and promoting sterile injection practices. Biomedical interventions like Pre-Exposure Prophylaxis (PrEP) for high-risk HIV-negative individuals and Post-Exposure Prophylaxis (PEP) for emergency post-exposure situations are highly effective.
For HIV-positive individuals, Antiretroviral Therapy (ART) not only manages their health but also prevents onward transmission ('Treatment as Prevention' or U=U). Preventing mother-to-child transmission involves ART for pregnant mothers and safe delivery/feeding practices.
Regular HIV testing and education are crucial for early diagnosis, treatment, and informed decision-making to halt the spread of the virus.
Often confused with
Side-by-side differences the NEET paper likes to test.
| Aspect | Prevention of AIDS | Pre-Exposure Prophylaxis (PrEP) vs. Post-Exposure Prophylaxis (PEP) |
|---|---|---|
| Timing of Use | Taken *before* potential HIV exposure (proactive) | Taken *after* potential HIV exposure (reactive, emergency) |
| Target Population | HIV-negative individuals at ongoing high risk of acquiring HIV | HIV-negative individuals who have experienced a recent, specific potential HIV exposure |
| Duration of Treatment | Daily or on-demand for as long as high-risk exposure continues | 28-day course, started as soon as possible (within 72 hours) after exposure |
| Purpose | To prevent HIV infection from occurring | To prevent HIV infection from taking hold after a potential exposure |
| Mechanism | Maintains protective drug levels in the body to block viral replication upon exposure | Floods the body with antiretrovirals to stop the virus from replicating and establishing infection post-exposure |
PrEP and PEP are both biomedical tools utilizing antiretroviral drugs for HIV prevention, but they serve distinct purposes based on the timing of intervention relative to exposure. PrEP is a proactive strategy for ongoing protection in high-risk individuals, taken continuously to maintain drug levels.
PEP is a reactive, emergency measure initiated rapidly after a specific potential exposure to prevent the virus from establishing itself. Understanding this temporal difference and their respective target populations is crucial for effective application.
Why it is tested: NEET relevance: Differentiating between PrEP and PEP is a common conceptual question. Aspirants must understand when and why each is used, their mechanisms, and their target populations, as these represent key advancements in HIV prevention strategies.