AntiMicrobial Resistance Antimicrobial resistance (AMR) is the ability of a microorganism (like bacteria, viruses, and some parasites) to stop an antimicrobial (such as antibiotics, antivirals and antimalarials) from working against it. As a result, standard treatments become ineffective, infections persist and may spread to others. (WHO definition) 岡山大学病院 萩谷 総合内科・総合診療科 英大(はぎや ひではる)