The World Health Organization (WHO) published a revised list in 2019 of 'Critically Important Antimicrobials for Human Medicine, 6th revision'[38] with the intent that it be used "as a reference to help formulate and prioritise risk assessment and risk management strategies for containing antimicrobial resistance due to human and non-human antimicrobial use to help preserve the effectiveness of currently available antimicrobials. It lists its Highest Priority Critically Important Antimicrobials as: 3rd, 4th and 5th generation cephalosporins, glycopeptides, macrolides and ketolides, polymyxins including colistin, and quinolones including fluoroqinolones.