It took the Adaptive Immune System about a week to make thousands of Killer T Cells and millions of antibodies that are extremely good at hunting HIV down—but already there are numerous new viruses that have new and different antigens! Different enough that the Killer Cells and Antibodies you just made may be useless against them. And now the new and different viruses infect new cells and make millions of copies of themselves, again. For them, the virus your Adaptive Immune System adapted to is already old news and irrelevant. HIV is always a step ahead of the immune system. And so in the
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