Molecular detection of enterotoxins E, G, H and I in Staphylococcus aureus and coagulase-negative staphylococci isolated from clinical samples of newborns in Brazil

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dc.contributor.authorVasconcelos, N. G. [UNESP]
dc.contributor.authorPereira, V. C. [UNESP]
dc.contributor.authorAraujo Junior, J. P. [UNESP]
dc.contributor.authorda Cunha, M. de L. R. S. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:51:05Z
dc.date.available2014-05-20T13:51:05Z
dc.date.issued2011-09-01
dc.description.abstractAims: The objective of this study was to investigate the detection of SEE, SEG, SEH and SEI in strains of Staphylococcus aureus and coagulase-negative staphylococci (CNS) using RT-PCR.Methods and Results: In this study, 90 Staph. aureus strains and 90 CNS strains were analysed by PCR for the detection of genes encoding staphylococcal enterotoxins (SE) E, G, H and I. One or more genes were detected in 54 (60%) Staph. aureus isolates and in 29 (32.2%) CNS isolates. Staphylococcus epidermidis was the most frequently isolated CNS species (n = 64, 71.1%), followed by Staphylococcus warneri (n = 8, 8.9%) and other species (Staphylococcus haemolyticus, Staphylococcus hominis, Staphylococcus lugdunensis, Staphylococcus simulans, Staphylococcus saprophyticus and Staphylococcus xylosus: n = 18, 20%). The genes studied were detected in Staph. epidermidis, Staph. warneri, Staph. haemolyticus, Staph. hominis, Staph. simulans and Staph. lugdunensis. The highest frequency of genes was observed in Staph. epidermidis and Staph. warneri, a finding indicating differences in the pathogenic potential between CNS species and highlighting the importance of the correct identification of these micro-organisms. RT-PCR used for the detection of mRNA revealed the expression of SEG, SEH and/or SEI in 32 (59.3%) of the 90 Staph. aureus isolates, whereas expression of some of these genes was observed in 10 (34.5%) of the 90 CNS isolates.Conclusions: Staphylococcus epidermidis was the most toxigenic CNS species. Among the other species, only Staph. warneri and Staph. lugdunensis presented a positive RT-PCR result. PCR was efficient in confirming the toxigenic capacity of Staph. aureus and CNS.Significance and Impact of the Study: This study permitted to confirm the toxigenic capacity of CNS to better characterize the pathogenic potential of this group of micro-organisms. In addition, it permitted the detection of SEG, SEH and SEI, enterotoxins that cannot be detected by commercially available immunological methods.en
dc.description.affiliationUNESP Univ Estadual Paulista, Inst Biosci, Dept Microbiol & Immunol, BR-18618970 São Paulo, Brazil
dc.description.affiliationUnespUNESP Univ Estadual Paulista, Inst Biosci, Dept Microbiol & Immunol, BR-18618970 São Paulo, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdFAPESP: 05/02293-9
dc.format.extent749-762
dc.identifierhttp://dx.doi.org/10.1111/j.1365-2672.2011.05076.x
dc.identifier.citationJournal of Applied Microbiology. Malden: Wiley-blackwell, v. 111, n. 3, p. 749-762, 2011.
dc.identifier.doi10.1111/j.1365-2672.2011.05076.x
dc.identifier.issn1364-5072
dc.identifier.urihttp://hdl.handle.net/11449/18243
dc.identifier.wosWOS:000293913500022
dc.language.isoeng
dc.publisherWiley-Blackwell
dc.relation.ispartofJournal of Applied Microbiology
dc.relation.ispartofjcr2.160
dc.relation.ispartofsjr0,795
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectdetectionen
dc.subjectgene expressionen
dc.subjectstaphylococcien
dc.subjecttoxigenicityen
dc.subjecttoxinsen
dc.titleMolecular detection of enterotoxins E, G, H and I in Staphylococcus aureus and coagulase-negative staphylococci isolated from clinical samples of newborns in Brazilen
dc.typeArtigo
dcterms.licensehttp://www.nhm.ac.uk/hosted_sites/acarology/saas/saa/aim.html
dcterms.rightsHolderWiley-blackwell
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt

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