Welcome to the Glossary of Commonly Used HIV/AIDS Terms! This feature provides a number of uses. Learn basic definitions, brush up on medical terms or provider lingo, or use the glossary as a reference guide in understanding the many acronyms found in the HIV/AIDS language. Whatever your needs, use the glossary to meet them.

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Drug Resistance

The ability of some disease-causing microorganisms, such as bacteria, viruses and mycoplasma, to adapt themselves, to grow and to multiply even in the presence of drugs that usually kill them.