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Nasal carriage of Staphylococcus aureus: epidemiology, underlying mechanisms, and associated risks Kluytmans J; van Belkum A; Verbrugh HClin Microbiol Rev 1997[Jul]; 10 (3): 505-20Staphylococcus aureus has long been recognized as an important pathogen in human disease. Due to an increasing number of infections caused by methicillin-resistant S. aureus (MRSA) strains, therapy has become problematic. Therefore, prevention of staphylococcal infections has become more important. Carriage of S. aureus appears to play a key role in the epidemiology and pathogenesis of infection. The ecological niches of S. aureus are the anterior nares. In healthy subjects, over time, three patterns of carriage can be distinguished: about 20% of people are persistent carriers, 60% are intermittent carriers, and approximately 20% almost never carry S. aureus. The molecular basis of the carrier state remains to be elucidated. In patients who repeatedly puncture the skin (e.g., hemodialysis or continuous ambulatory peritoneal dialysis [CAPD] patients and intravenous drug addicts) and patients with human immunodeficiency virus (HIV) infection, increased carriage rates are found. Carriage has been identified as an important risk factor for infection in patients undergoing surgery, those on hemodialysis or CAPD, those with HIV infection and AIDS, those with intravascular devices, and those colonized with MRSA. Elimination of carriage has been found to reduce the infection rates in surgical patients and those on hemodialysis and CAPD. Elimination of carriage appears to be an attractive preventive strategy in patients at risk. Further studies are needed to optimize this strategy and to define the groups at risk.|*Staphylococcal Infections/epidemiology/etiology/prevention & control[MESH]|*Staphylococcus aureus/pathogenicity/physiology[MESH]|Bacterial Adhesion[MESH]|Carrier State/epidemiology/*microbiology/prevention & control[MESH]|Endothelium[MESH]|Endothelium, Corneal[MESH]|Epithelium[MESH]|HIV Infections/complications[MESH]|Humans[MESH]|Peritoneal Dialysis, Continuous Ambulatory[MESH]|Renal Dialysis[MESH]|Risk Factors[MESH]|Surgical Wound Infection/microbiology[MESH] |
