Table 2.

Twelve species of pathogenic bacteria prioritized by the World Health Organization (WHO) as representing substantial antibiotic resistance concern. WHO classification is based on the three categories according to the impact on human health and need for new antibiotic treatments

Importance	Pathogen	Confer resitance to
Critical	Acinetobacter baumannii	Carbapenem
	Pseudomonas aeruginosa	Carbapenem
	Enterobacteriaceae	Carbapenem, ESBL-producing
High	Enterococcus faecium	Vancomycin
	Staphylococcus aureus	Methicillin, vancomycin
	Helicobacter pylori	Clarithromycin
	Campylobacter spp.	Fluoroquinolone
	Salmonellae	Fluoroquinolone
	Neisseria gonorrhoeae	Cephalosporin, fluoroquinolone
Medium	Streptococcus pneumoniae	Penicillin
	Haemophilus influenzae	Ampicillin
	Shigella spp.	Fluoroquinolone