Background Necrotizing fasciitis is a life-threatening infectionrequiring urgent surgical and medical therapy. Staphylococcusaureus has been a very uncommon cause of necrotizing fasciitis,but we have recently noted an alarming number of these infectionscaused by community-associated methicillin-resistant S. aureus(MRSA).
Methods We reviewed the records of 843 patients whose woundcultures grew MRSA at our center from January 15, 2003, to April15, 2004. Among this cohort, 14 were identified as patientspresenting from the community with clinical and intraoperativefindings of necrotizing fasciitis, necrotizing myositis, orboth.
Results The median age of the patients was 46 years (range,28 to 68), and 71 percent were men. Coexisting conditions orrisk factors included current or past injection-drug use (43percent); previous MRSA infection, diabetes, and chronic hepatitisC (21 percent each); and cancer and human immunodeficiency virusinfection or the acquired immunodeficiency syndrome (7 percenteach). Four patients (29 percent) had no serious coexistingconditions or risk factors. All patients received combined medicaland surgical therapy, and none died, but they had serious complications,including the need for reconstructive surgery and prolongedstay in the intensive care unit. Wound cultures were monomicrobialfor MRSA in 86 percent, and 40 percent of patients (4 of 10)for whom blood cultures were obtained had positive results.All MRSA isolates were susceptible in vitro to clindamycin,trimethoprimsulfamethoxazole, and rifampin. All recoveredisolates belonged to the same genotype (multilocus sequencetype ST8, pulsed-field type USA300, and staphylococcal cassettechromosome mec type IV [SCCmecIV]) and carried the PantonValentineleukocidin (pvl), lukD, and lukE genes, but no other toxin geneswere detected.
Conclusions Necrotizing fasciitis caused by community-associatedMRSA is an emerging clinical entity. In areas in which community-associatedMRSA infection is endemic, empirical treatment of suspectednecrotizing fasciitis should include antibiotics predictablyactive against this pathogen.
Source Information
From the Divisions of Infectious Diseases and HIV Medicine (L.G.M., G.R., A.S.B., B.S.) and the Department of Internal Medicine (L.G.M., G.R., J.P., A.S.B., B.S.), HarborUCLA Medical Center and the Los Angeles Biomedical Institute at HarborUCLA, Torrance; the University of California, San Francisco (F.P.-R.); and St. Mary Medical Center, Long Beach (S.M., A.W.T., T.O.P.) all in California.
MRSA in the Community
Chapman A. L.N., Greig J. M., Innes J. A., Hageman J. C., Lynfield R., Fridkin S. K., Miller L. G., Perdreau-Remington F., Spellberg B.
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N Engl J Med 2005;
353:530-532, Aug 4, 2005.
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