Antimicrobial resistance results when bacteria or other microorganisms become able to resist the killing activity of antimicrobials. Microorganisms become resistant due to excess use of antimicrobials. Use antimicrobials only for conditions where there is evidence that antibiotics are effective. Avoid them for conditions where they do not help, such as the common cold.
Multi-drug resistant organisms or MDROs are bacteria that can resist several kinds of antibiotics. MDROs are harder to treat. Examples of MDROs include: