World AIDS Vaccine Day

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Many vaccines work because viruses stay relatively stable. HIV behaves differently; it mutates rapidly, creates many variants inside the same person, and attacks the very immune cells meant to coordinate defence. This gives scientists a moving target instead of a fixed one, making long-term immune protection difficult to build.

HIV hides key parts of its surface beneath sugar-like molecules that make immune detection harder. Even when the body produces antibodies, the virus often changes shape fast enough to escape them. Some people eventually develop “broadly neutralising antibodies,” but this process can take years, which complicates vaccine design.

Many people imagine vaccines as complete shields against infection. HIV researchers also study vaccines that reduce viral load, delay disease progression, or lower transmission risk after exposure. Because HIV integrates into human cells quickly, scientists often focus on controlling the virus early instead of expecting perfect blockage.

Current HIV vaccine research includes mRNA platforms, viral vectors, protein-based vaccines, and combinations designed to trigger broader immune responses. Some approaches attempt to guide the immune system step-by-step toward producing rare antibodies capable of recognising many HIV strains across different regions of the world.

While vaccine research continues, existing prevention tools already reduce HIV transmission significantly. These include condoms, regular testing, antiretroviral therapy, sterile injection practices, and PrEP, a medication taken by HIV-negative people at higher risk of exposure. Early treatment also helps lower viral load and reduce onward transmission.

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