Molecular detection of virulence factors among food and clinical Enterococcus faecalis strains in South Brazil
Braz. j. microbiol
;
45(1): 327-332, 2014.
Article
Dans Anglais
| LILACS
| ID: lil-709469
ABSTRACT
The present report aimed to perform a molecular epidemiological survey by investigating the presence of virulence factors in E. faecalis isolated from different human clinical (n = 57) and food samples (n = 55) in Porto Alegre, Brazil, collected from 2006 to 2009. In addition, the ability to form biofilm in vitro on polystyrene and the β-haemolytic and gelatinase activities were determined. Clinical strains presented a higher prevalence of aggregation substance (agg), enterococcal surface protein (esp) and cytolysin (cylA) genes when compared with food isolates. The esp gene was found only in clinical strains. On the other hand, the gelatinase (gelE) and adherence factor (ace) genes had similar prevalence among the strains, showing the widespread occurrence of these virulence factors among food and clinical E. faecalis strains in South Brazil. More than three virulence factor genes were detected in 77.2% and 18.2% of clinical and food strains, respectively. Gelatinase and β-haemolysin activities were not associated with the presence of gelE and cylA genes. The ability to produce biofilm was detected in 100% of clinical and 94.6% of food isolates, and clinical strains were more able to form biofilm than the food isolates (Student's t-test, p < 0.01). Results from the statistical analysis showed significant associations between strong biofilm formation and ace (p = 0.015) and gelE (p = 0.007) genes in clinical strains. In conclusion, our data indicate that E. faecalis strains isolated from clinical and food samples possess distinctive patterns of virulence factors, with a larger number of genes that encode virulence factors detected in clinical strains.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Protéines bactériennes
/
Infections bactériennes à Gram positif
/
Enterococcus faecalis
/
Facteurs de virulence
/
Microbiologie alimentaire
Type d'étude:
Etude diagnostique
/
Facteurs de risque
Limites du sujet:
Humains
Pays comme sujet:
Amérique du Sud
/
Brésil
langue:
Anglais
Texte intégral:
Braz. j. microbiol
Thème du journal:
Microbiologie
Année:
2014
Type:
Article
/
descriptif de projet
Pays d'affiliation:
Brésil
Institution/Pays d'affiliation:
Universidade Federal do Rio Grande do Sul/BR
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