TableĀ 1:

World Health Organization categorisation of antimicrobials with respect to their importance for human health

Criterion 1An antimicrobial agent which is the sole or one of limited available therapies to treat serious human disease
Criterion 2An antimicrobial agent which is used to treat diseases caused by organisms that may be transmitted to people from non-human sources or human diseases which are caused by organisms that may acquire resistance genes from non-human sources
Critically importantThose antimicrobials which meet both Criterion 1 and Criterion 2 are termed critically important for human medicine
Highly importantThose antimicrobials which meet either Criterion 1 or Criterion 2 are termed highly important for human medicine
ImportantThose antimicrobials which meet neither Criterion 1 nor Criterion 2 are termed important for human medicine