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

Kavitha Shettigar, Spoorthi Jain, Deepika V. Bhat, Raviraj Acharya, Lingadakai Ramachandra, Kapaettu Satyamoorthy, Thokur Sreepathy Murali

Research output: Contribution to journalArticle

7 Citations (Scopus)

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.

Original languageEnglish
Article number000370
Pages (from-to)1392-1404
Number of pages13
JournalJournal of Medical Microbiology
Volume65
Issue number12
DOIs
Publication statusPublished - 01-12-2016

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Diabetic Foot
Coinfection
Virulence
Staphylococcus aureus
Biofilms
Microbial Drug Resistance
Genes
Foot Ulcer
Multilocus Sequence Typing
Minisatellite Repeats
Tandem Repeat Sequences
Nucleic Acid Repetitive Sequences
Wounds and Injuries
Wound Infection
Methicillin-Resistant Staphylococcus aureus
Septic Shock
Amputation
Public Health
Chromosomes
History

All Science Journal Classification (ASJC) codes

  • Microbiology
  • Microbiology (medical)

Cite this

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title = "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.",
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Virulence determinants in clinical Staphylococcus aureus from monomicrobial and polymicrobial infections of diabetic foot ulcers. / Shettigar, Kavitha; Jain, Spoorthi; Bhat, Deepika V.; Acharya, Raviraj; Ramachandra, Lingadakai; Satyamoorthy, Kapaettu; Murali, Thokur Sreepathy.

In: Journal of Medical Microbiology, Vol. 65, No. 12, 000370, 01.12.2016, p. 1392-1404.

Research output: Contribution to journalArticle

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AU - Shettigar, Kavitha

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AU - Murali, Thokur Sreepathy

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