Trends in Antibiotic Resistance of Nosocomial and Community-Acquired Infections in Italy.

The World Health Organization has recently identified three categories of pathogens, namely: critical, high, and medium priority, according to the need for new antibiotics. Critical priority pathogens include carbapenem-resistant microorganism (CPO) such as and , , and spp., whereas vancomycin-resistant (VRE) methicillin and vancomycin-resistant (MRSA) are in the high priority list.