Once a person gets HIV, the
virus begins to multiply in the body. As
HIV multiplies, it sometimes changes form (mutates). Some
HIV mutations that develop while a person is taking
HIV medicines can lead to drug-resistant HIV. Once drug resistance develops,
HIV medicines that previously controlled the person’s
HIV are no longer effective. In other words,
HIV medicines can’t prevent drug-resistant
HIV from multiplying. Drug resistance can cause
HIV treatment to fail. Drug-resistant
HIV can spread from person to person (called transmitted resistance). People with transmitted resistance have
HIV that is resistant to one or more
HIV medicines even before they start taking
HIV medicines.
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