title: Comparison of microbiological and clinical characteristics based on SCCmec typing in patients with community-onset meticillin-resistant Staphylococcus aureus (MRSA) bacteraemia.
abstract: Molecular identification methods based on the staphylococcal cassette chromosome mec (SCCmec) genotype are more reliable than clinical risk factors and demographic data for differentiating community-acquired and healthcare-associated (HCA) meticillin-resistant Staphylococcus aureus (MRSA). However, patients with community-onset (CO) MRSA infections, defined as a culture-positive sample obtained <48h after admission and from patients with HCA risk factors, have been infrequently studied. This study compared the clinical profiles of different SCCmec genotypes in this group of patients. From 2004 to 2008, the clinical profiles of 122 non-repetitive patients with CO-MRSA infections at a tertiary medical centre in Taiwan were retrospectively recorded and the molecular characteristics of the isolates were examined. The proportion of SCCmec IV/V genotypes increased from 9.5% to 35.3% from 2004 to 2008. There were no differences in demographic data, underlying diseases, invasive procedures or outcomes between the SCCmec II/III and IV/V groups, except that patients with SCCmec II/III genotypes tended to have more HCA risk factors (3.1 vs. 2.4; P=0.008). Multivariate logistic regression analysis revealed that having at least four HCA risk factors was independently associated with SCCmec II/III. The sensitivity of recovering SCCmec IV/V genotypes from patients with less than four HCA risk factors was 89.3%. This study revealed the emergence of SCCmec IV/V genotypes in CO-MRSA infections. Although the clinical characteristic boundaries between SCCmec II/III and IV/V diminished, having at least four HCA risk factors made the presence of SCCmec IV/V genotypes less likely in patients with CO-MRSA infections.
authors: Division of Infectious Diseases, Department of Medicine, Taipei Veterans General Hospital, No. 201 Sec. 2 Shih-Pai Road, Taipei, Taiwan.
authors: Shu-Chen
authors: SC
authors: Kuo
authors: Mei-Chun
authors: MC
authors: Chiang
authors: Wen-Sen
authors: WS
authors: Lee
authors: Liang-Yu
authors: LY
authors: Chen
authors: Hau-Shin
authors: HS
authors: Wu
authors: Kwok-Woon
authors: KW
authors: Yu
authors: Chang-Phone
authors: CP
authors: Fung
authors: Fu-Der
authors: FD
authors: Wang
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D016470:Bacteremia / Q000453:epidemiology* / Q000382:microbiology; D015373:Bacterial Typing Techniques; D017714:Community-Acquired Infections / Q000453:epidemiology* / Q000382:microbiology; D003428:Cross Infection / Q000453:epidemiology* / Q000382:microbiology; D005260:Female; D005838:Genotype; D049690:History, Ancient; D006787:Hospitals, Veterans; D006801:Humans; D008297:Male; D016106:Methicillin Resistance / Q000235:genetics; D055624:Methicillin-Resistant Staphylococcus aureus / Q000145:classification* / Q000235:genetics* / Q000302:isolation & purification / Q000472:pathogenicity; D008875:Middle Aged; D017720:Molecular Epidemiology; D012307:Risk Factors; D013203:Staphylococcal Infections / Q000453:epidemiology* / Q000382:microbiology; D013624:Taiwan