Before revision: 667x667px|A variety of different bacteria - testing for antimicrobial resistance Multidrug Resistant Bacteria (MDR Bacteria ) are bacteria that are resistant to three or more classes of antimicrobial drugs.
After revision: 667x667px|A variety of different bacteria - testing for antimicrobial resistance Multidrug-resistant bacteria (MDR bacteria ) are bacteria that are resistant to three or more classes of antimicrobial drugs.