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lüll Increasing antibiotic resistance among methicillin-resistant Staphylococcus aureus strains Sakoulas G; Moellering RC JrClin Infect Dis 2008[Jun]; 46 Suppl 5 (ä): S360-7Vancomycin use has increased dramatically worldwide since the mid-1980s, largely as a result of empirical and directed therapy against burgeoning methicillin-resistant Staphylococcus aureus (MRSA) infections. With limited choices, clinicians have traditionally relied on vancomycin alone in the management of serious MRSA infections and have enjoyed a significant period free of vancomycin resistance in S. aureus. Even now, 5 decades after its introduction, vancomycin resistance among S. aureus strains, as currently defined microbiologically, remains rare. Yet it is becoming clear that vancomycin is losing potency against S. aureus, including MRSA. Serious infections due to MRSA defined as susceptible in the laboratory are not responding well to vancomycin. This is demonstrated by increased mortality seen in patients with MRSA infection and markedly attenuated vancomycin efficacy caused by vancomycin heteroresistance in S. aureus. Therefore, it appears that our definition of vancomycin susceptibility requires further scrutiny as applied to serious MRSA infections, such as bacteremia and pneumonia.|*Methicillin Resistance[MESH]|*Vancomycin Resistance[MESH]|Anti-Bacterial Agents/*pharmacology/therapeutic use[MESH]|Humans[MESH]|Staphylococcal Infections/*drug therapy/*microbiology/mortality[MESH]|Staphylococcus aureus/*drug effects/isolation & purification[MESH]|Vancomycin/*pharmacology/therapeutic use[MESH] |