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Virulence determinants in clinical Staphylococcus aureus from monomicrobial and polymicrobial infections of diabetic foot ulcers.

Abstract：

:Antibiotic resistance in Staphylococcus aureus is a major public health concern, and methicillin-resistant S. aureus has emerged as an important pathogen. We characterized S. aureus isolates from monomicrobial and polymicrobial wound infections from 200 diabetic individuals with foot ulcers to understand their underlying diversity and pathogenicity. Staphylococcal cassette chromosome mec typing was performed, and genes coding for production of biofilm, Panton-Valentine leukocidin, toxic shock syndrome toxin and leukotoxins DE and M were screened. Biofilm production was also quantified by the tissue culture plate method. Strains were genotyped using multilocus sequence typing, multiple-locus variable number tandem repeat analysis and repetitive sequence PCR methods. Polymicrobial infections were present in 115 samples, 61 samples showed monomicrobial infection and 24 samples were culture negative. Polymicrobial infections were significantly higher in patients with previous amputation history. Of the 86 samples infected with S. aureus, virulence genes were found in 81 isolates, and 41 isolates possessed more than one virulence gene. Strains which contained pvl gene alone or luk-DE alone were significantly higher in polymicrobial wounds. Based on biofilm production, 18.6 % of isolates were classified as high, 24.4 % as moderate and 57 % as low biofilm producers. Genotyping of 30 strains revealed 10 different sequence types with a strong association among sequence types, specific virulence markers and antibiotic resistance profiles. Moreover, isolates from monomicrobial and polymicrobial wounds differed significantly in their virulence potential and the sequence types to which they belonged, and these are helpful in mapping the evolution of the identified strains of S. aureus.

journal_name

J Med Microbiol

journal_title

Journal of medical microbiology

authors

Shettigar K,Jain S,Bhat DV,Acharya R,Ramachandra L,Satyamoorthy K,Murali TS

doi

10.1099/jmm.0.000370

subject

Has Abstract

pub_date

2016-12-01 00:00:00

pages

1392-1404

issue

eissn

0022-2615

issn

1473-5644

journal_volume

pub_type

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Virulence determinants in clinical Staphylococcus aureus from monomicrobial and polymicrobial infections of diabetic foot ulcers.