DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Conceptual computer illustration of a drug capsule being pushed aside by microbes that have developed an immunity to the drug. Drug resistance is the reduction in effectiveness of a drug such as an antimicrobial or an antineoplastic in curing a disease or condition. Drug or toxin or chemical resistance is a consequence of evolution and is a response to pressures imposed on any living organism. Individual organisms vary in their sensitivity to the drug used and those with greater fitness may be capable of surviving drug treatment ultimately rendering some drugs ineffective.
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