1. HIV Begins Replicating Quickly - Once HIV enters the body, it starts multiplying rapidly — often within hours. The virus attempts to establish infection by integrating into your immune cells.
2. The 72-Hour Window Is Critical - PEP must be started within 72 hours (3 days) of potential exposure. After 72 hours, the virus may already have integrated into cells, making prevention far less likely.
3. PEP Is Highly Effective — If Taken Properly - PEP can reduce HIV infection risk by over 80–90% in many exposure scenarios. However, delayed initiation significantly reduces this protective benefit.
4. Exposure Situations Where Timing Matters - PEP is recommended after: Unprotected sex with someone HIV-positive or unknown status, Condom break during intercourse, Needle-sharing exposure. In all these cases, immediate medical attention is crucial.
5. Once HIV Establishes Infection, It Becomes Lifelong - If HIV successfully integrates into your immune system: It becomes a chronic condition, Lifelong antiretroviral therapy (ART) is required. Timely PEP may prevent this outcome entirely.
Timely PEP treatment is crucial because HIV moves fast — and PEP only works before the virus permanently establishes infection. If started within 72 hours and taken correctly for 28 days, PEP can be a powerful tool in preventing HIV.
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