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Characterisation of the Virulence Factors and Genetic Types of Methicillin Susceptible Staphylococcus aureus from Patients and Healthy Individuals

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Abstract

Methicillin sensitive Staphylococcus aureus is an important bacterial pathogen associated with hospital- and community-acquired infections leading to endocarditis, skin tissue infection and pneumonia. The objective of this study was to determine both the genetic characteristics of methicillin-sensitive S. aureus (MSSA) strains, and the occurrence of virulence factors produced by S. aureus strains isolated from UMMC and healthy students in the University from year 2009. Out of 429 nasal swab samples, 67 were MSSA. The prevalence of 21 different virulence genes among 67 Malaysian clinical and community MSSA strains was determined by PCR, and their genetic features were assessed by PCR-RFLP of coa gene, agr types, spa typing and PFGE. The five predominant virulence genes were ica (79 %), efb and fnbA (61 % each), sdrE (57 %) and hlg (45 %). Toxin genes (enterotoxin, etd and pvl) were significantly more common (P < 0.05) in clinical strains compared to community strains. Three agr genotypes were observed: agr type I (45 %), agr type III (25 %) and agr type II (19 %). All 67 MSSA strains were distinguished into 26 profiles by PCR-RFLP of coa, 55 pulsotypes and 21 spa types. Four novel spa types (t7312, t7581, t7582 and t7583) were observed. In conclusion, different virulence profiles were observed in MSSA strains in Malaysia where toxin genes were more prevalent among clinical strains. No correlation between DNA profiles (coa-RFLP, PFGE and spa) and virulotypes was observed. The Malaysian MSSA strains from clinical and community sources were genetically diverse and heterogeneous.

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Acknowledgments

This work was funded by PPP Grant (PV046/2011B) from University of Malaya and PulseNet Grant (57-02-03-1015) from JJID, Japan. LKT is supported by University of Malaya Fellowship.

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Authors and Affiliations

  1. Institute of Biological Science, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia

    King-Ting Lim & Kwai-Lin Thong

  2. Biomedical Science and Molecular Microbiology Laboratory, Institute of Graduate Studies, University of Malaya, Kuala Lumpur, Malaysia

    King-Ting Lim & Kwai-Lin Thong

  3. Department of Medical Microbiology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia

    Yasmin Abu Hanifah & Mohd Yasim Mohd Yusof

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  1. King-Ting Lim
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  2. Yasmin Abu Hanifah
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  3. Mohd Yasim Mohd Yusof
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  4. Kwai-Lin Thong
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Correspondence to Kwai-Lin Thong.

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Lim, KT., Hanifah, Y.A., Yusof, M.Y.M. et al. Characterisation of the Virulence Factors and Genetic Types of Methicillin Susceptible Staphylococcus aureus from Patients and Healthy Individuals. Indian J Microbiol 52, 593–600 (2012). https://doi.org/10.1007/s12088-012-0286-7

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  • DOI: https://doi.org/10.1007/s12088-012-0286-7

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