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Observation with time of the rise and fall of community-acquired MRSA and its pathogenicinvestigation

Research Project

Project/Area Number 14370097
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Bacteriology (including Mycology)
Research InstitutionJUNTENDO UNIVERSITY

Principal Investigator

HIRAMATSU Keiichi  Juntendo University, Bacteriology, professor, 医学部, 教授 (10173262)

Co-Investigator(Kenkyū-buntansha) KUWAHARA Kyoko  Juntendo University, assistant professor, 医学部, 助手 (10167976)
YAMAMOTO Munetaka  Juntendo University, assistant professor, 医学部, 助手 (50338414)
Project Period (FY) 2002 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥8,600,000 (Direct Cost: ¥8,600,000)
Fiscal Year 2005: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2004: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2003: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2002: ¥2,300,000 (Direct Cost: ¥2,300,000)
KeywordsCommunity aquired MRSA / Hospital MRSA / Healthy children / Healthy / SCC mec / MLST / PFGE / Coagulase typing / MRC-NS / 看護師 / 院内獲得型MRSA / MRSA / 市中感染 / メチシリン耐性遺伝子 / ブドウ球菌 / 小児 / 健康キャリアー / フィールド調査
Research Abstract

We collected nasal samples from 818 children at 6 day care centers and 2 kindergartens of three districts, Miyagi, Kyoto and Saga during June 2001 and Nov.2002. And also we collected nasal samples from 271 medical students with no clinical experience and 86 nurses, during 2003 and 2005.
Findings : Among 818 children, 35 children (4.3%) carried MRSA and 231 children (28.2%) carried methicillin-resistant coagulase-negative staphylococci (MRC-NS). 2 students (0.7%) and 3nurses (3.5%) carried MRSA and 123 students (45.4%) and 63 nurses (73.3%) carried MRC-NS. The types of staphylococcal cassette chromosome mec (SCCmec) found among 44 MRSA isolates from children were as follows : type IIa, 11 isolates ; type IIb, 19 isolates ; type IV, 14 isolates. The type IIb SSCmec element was a new SCCmec element found in this study. Eleven (25%) strains which belonged to clonal complex 5 (CC5) carried type IIa SCCmec, and they produced type 2 coagulase and toxic shock syndrome toxin 1. They were indistinguishable from hospital-aquired MRSA or health care-associated MRSA (H-MRSA) strains in Japan, represented by strain N315. On the other hand, 33 (75%) strains, most of which belonged to CC78 or CC91, carried small SCCmec elements, such as type IIb or type IV, and they produced type 1 or type 3 coagulase and exofoliative toxin. Among 135 MR-epidermidis isolated from healthy Japanese students and nurse, most prevalent SCCmec type were type IV SCCmec (120 strains, 88.9%). Conclusions : We found that MRSA are already prevalent among healthy children and healthy students, and also MRC-NS are prevalent among healthy children, students and especially nurse. The fact that type IV MRC-NS strains were prevalent in the community suggested that they might serve as a reservoir for the SCCmec element carried by MRSA strains disseminated in the community.

Report

(5 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (23 results)

All 2005 Other

All Journal Article (2 results) Publications (21 results)

  • [Journal Article] Dissemination of Methicillin-resistant Staphylococci among Healthy Japanese Children2005

    • Author(s)
      Ken Hisata, et al.
    • Journal Title

      Journal of Clinical Microbiology 43-7

      Pages: 3364-3372

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Wide dissemination ofmethicillin-resistant staphylococci carrying type-2B (IV)staphylococcal cassette chromosome mec(SCCmec) among healthy Japanese children2005

    • Author(s)
      Hisata Ken et al.
    • Journal Title

      Journal of Clinical Microbiology (発表予定)

    • Related Report
      2004 Annual Research Report
  • [Publications] Ito, T., et al.: "Insights on Antibiotic Resistance of Staphylococcus aureus from its Whole Genome Genomic : Island SCC"Drug Res.Updates. 6. 41-52 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Cui, L., et al.: "Cell Wall Thickening Is a Common Feature of Vancomycin Resistance in Staphylococcus aureus"J.Clin.Microbiol. 41. 5-14 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Yoshida, R., et al.: "Physiological and molecular analysis of a mecA-negative Staphylococcus aureus clinical strain that expresses heterogeneous methicillin resistance"J Antimicrob Chemother. 51. 247-255 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Katayama, Y., et al.: "Identification in a methicillin-susceptible Staphylococcus hominis of an active primordial mobile genetic element for the staphylococcal cassette chromosome mec (SCCmec) of methicillin-resistant Staphylococcus aureus."J.Bacteriol. 185. 2711-2722 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Isnansetyo, A., et al.: "Antibacterial activity of 2,4-diacetylphloroglucinol(DAPG) produced by Pseudomonas sp. AMSN isolated from a marine alga, against vancomycin-resistant Staphylococcus aureus (VRSA)"Int J Antimicrob Agents. 22. 545-547 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Kuroda, M., et al.: "Two-component system VraSR positively modulates the regulation of cell-wall biosynthesis pathway in Staphylococcus aureus"Molecular Microbiol. 49. 807-821 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Cui, L.et al.: "Vancomycin-resistant Staphylococcus aureus."Horizon Scientific Press. 340 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Kuroda, M. et al.: "Genomics, Proteomics and Clinical Bacteriology."Humana Press. 320 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Baba, T. et al.: "The Genome of Staphylococcus aureus."Eliis Harwood (In Press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Hiramatsu, K.: "Elucidation of the mechanism of antibiotic resistance acquisition of methicillin-resistant Staphylococcus aureus (MRSA) and determination of its whole genome nucleotide sequence"Jap Med Assoc J. (In Press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Hiramatsu, K., et al.: "The Staphylococcus aureus model"ASM Press (In Press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Hiramatsu, K. et al.: "Molecular Genetics of Methicillin-Resistant Staphylococcus aureus"Int J Med Microbiol. 292. 67-74 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Yoshida, R. et al.: "Physiological and molecular analysis of a mecA-negative Staphylococcus aureus clinical strain that expresses heterogeneous methicillin resistance"J Antimicrob Chemother. 51. 247-255 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Baba, T. et al.: "Genome and virulence determinants of high virulence community-acquired MRSA"Lancet.. 359. 1819-1827 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] van der Zwet W.C. et al.: "Nosocomial spread of a Staphylococcus capitis strain with hetero-resistance to vancmycin in a neonatal intensive care unit"J.Clin.Microbiol. 40. 2520-2525 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Ma X X.et al.: "A novel type of staphylococcal cassette chromsome mec (SCCmec) identified in community-acquired methicillin-resistant Staphylococcus aureus strains"Antimicrob.Agents.Chemother. 46. 1147-1152 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Okuma K. et al.: "Dissemination of New MRSA Clones in the Community"J.Clin.Microbiol.. 40. 4289-4294 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Daum, R.S.et al.: "A novel methicillin-resistance cassette in community-acquired methicillin-resistant Staphylococcus aureus isolates of diverse genetic"J Infect Dis.. 186. 1344-1347 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Hiramatsu, K. et al.: "New trends in Staphylococcus aureus infections : glycopeptide resistance in hospital and methicillin resistance in community"Current Opinion in Infections Diseases. 15. 407-413 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Kuroda, M. et al.: "Genome sequencing and annotation : an overview in Johnson, A., and Woodford, N., ed., Genomics, Proteomics and Clinical Bacteriology"Humana Press(in press).

    • Related Report
      2002 Annual Research Report
  • [Publications] Hiramatsu, K. et al.: "Application of Genomic Information to the Diagnosis, Management and Control of Bacterial Infections : The Staphylococcus aureus model"ASM press(in press).

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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