| BSI | Bloodstream infections |
| AMR | Antimicrobial resistance |
| WHO | World Health Organization |
| ISS | Istituto Superiore di Sanità |
| MRSA | Methicillin-resistant S. aureus |
| VRE | Vancomycin-resistant Enterococcus spp. |
| IQR | Interquartile range |
| ICU | Intensive care unit |
| NICU | Neonatal intensive care unit |
| UTI | Urinary tract infection |
| IAI | Intrabdominal infection |
| CNSI | Central nervous system infection |
| OI | Osteoarticular infection |
| SSTI | Skin and soft tissue infection |
| CCI | Charlson comorbidity index |
| LOS | Length of stay |
| CVC | Central venous catheter |
| TMP-SMX | Trimethoprim-sulfamethoxazole |
| AMCLI | Associazione microbiologi clinici italiani |
| EUCAST | European committee on antimicrobial susceptibility testing |
| CLSI | Clinical and laboratory standard institute |
| AST | Antimicrobial susceptibility |
| CI | Confidence interval |
| cOR | Crude odd ratio |
| aOR | Adjusted odd ratio |