A Drug Called AZT Was the First to Be Used

question 42

Essay

A drug called AZT was the first to be used against HIV. Although it initially worked, resistance developed quickly, and eventually the drug was no longer effective. Drug therapies used today, which often combine several different drugs that target different phases of the HIV life cycle into a cocktail, are much more effective over the long term than a single drug used in isolation. Please provide an evolutionary explanation for why newer therapies work better.

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