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While Hepatitis and HPV are still on the "no cure" STD list, HIV is just another stepping stone- and that's if the vaccine works well enough.
And yeah, the risk of AIDS adapting and mutating is a scary thought. This is partly because all current AIDS therapies work about the same way... and if the virus adapts, it would likely render them all useless. That would put us back at square one, with everyone dying with no therapy to prolong life.
...not to mention the fact that a mutating virus can end up different in any number of dangerous ways. It could kill more efficiently, it could spread more easily- either by a smaller amount needed to transmit it in the blood, or the ability to live outside the human body longer. Those factors alone would greatly increase infection rate.
I'm not saying the vaccine isn't a good idea, but there are some times when miracle cures or inventions' risks outweigh their benefits. Let's hope the benefits continue to win.
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