A natural phenomenon in which microbes acquire genes that enable resistance to antimicrobial agents. Patients can develop an AMR infection in one of two ways: 1. They can contract a resistant microbe infected by an agent that is resistant to medicines from the start. 2. A resistant microbe can emerge in their system after they start antimicrobial treatment. Resistant infections arising in this way, result from a treatment that killed off the susceptible microbes, but left resistant ones behind to flourish.
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