title: Predominance of community-associated methicillin-resistant Staphylococcus aureus strains carrying staphylococcal chromosome cassette mec type IVA in South Korea.
abstract: Studies on the molecular epidemiologic characteristics of methicillin-resistant Staphylococcus aureus (MRSA) strains have demonstrated their genetic and geographical diversity. In addition, it has been reported that there are genetic differences between community-associated (CA) and health care-associated (HA) MRSA strains. Therefore, we investigated the major epidemiologic characteristics of CA MRSA isolates in South Korea and compared them with those of HA MRSA strains. Distributions of staphylococcal chromosome cassette mec (SCCmec) types and other molecular features, including the Panton-Valentine leukocidin (PVL) gene, were studied in 138 invasive MRSA isolates. Multiplex type IVA SCCmec was identified as the major CA MRSA infection type (53.1%), with a significantly higher prevalence than in HA MRSA (P < 0.001). One major group of type IVA strains carried a larger atypical class B mec element and new subtypes of ccrA2 (96% amino acid homology). The PVL gene was detected in one USA300-like isolate only. Seven major clone types determined by combinational grouping (genetic background SCCmec typing) showed representative patterns of antimicrobial susceptibilities. We concluded that less multi-drug-resistant strains of clone types B-I and D-1 (genetic background, B and D complexes; type IVA SCCmec) predominate in CA MRSA and that international PVL-positive strains have not spread in South Korea as yet.
authors.affiliation: Catholic Research Institutes of Medical Science, College of Medicine, The Catholic University of Korea, Seoul, South Korea.
authors.forename: Chulmin
authors.initials: C
authors.lastname: Park
authors.forename: Dong-Gun
authors.initials: DG
authors.lastname: Lee
authors.forename: Sun Woo
authors.initials: SW
authors.lastname: Kim
authors.forename: Su-Mi
authors.initials: SM
authors.lastname: Choi
authors.forename: Sun Hee
authors.initials: SH
authors.lastname: Park
authors.forename: Hye-Sun
authors.initials: HS
authors.lastname: Chun
authors.forename: Jung-Hyun
authors.initials: JH
authors.lastname: Choi
authors.forename: Jin-Hong
authors.initials: JH
authors.lastname: Yoo
authors.forename: Wan Shik
authors.initials: WS
authors.lastname: Shin
authors.forename: Jin Han
authors.initials: JH
authors.lastname: Kang
authors.forename: Jong Hyun
authors.initials: JH
authors.lastname: Kim
authors.forename: Soo Young
authors.initials: SY
authors.lastname: Lee
authors.forename: Sun Mi
authors.initials: SM
authors.lastname: Kim
authors.forename: Bok Yang
authors.initials: BY
authors.lastname: Pyun
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001427:Bacterial Toxins / Q000235:genetics; D002876:Chromosomes, Bacterial / Q000235:genetics; D017714:Community-Acquired Infections / Q000453:epidemiology / Q000382:microbiology*; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D005098:Exotoxins / Q000235:genetics; D005838:Genotype; D006801:Humans; D007723:Korea / Q000453:epidemiology; D007956:Leukocidins / Q000235:genetics; D016106:Methicillin Resistance / Q000235:genetics*; D008826:Microbial Sensitivity Tests; D008969:Molecular Sequence Data; D015995:Prevalence; D017422:Sequence Analysis, DNA; D013203:Staphylococcal Infections / Q000453:epidemiology / Q000382:microbiology*; D013211:Staphylococcus aureus / Q000145:classification* / Q000187:drug effects / Q000235:genetics* / Q000302:isolation & purification
chemical_list: D000900:Anti-Bacterial Agents; D001427:Bacterial Toxins; D004269:DNA, Bacterial; D005098:Exotoxins; D007956:Leukocidins; C078284:Panton-Valentine leukocidin