Enterotoxins, Biofilm and Resistance to Antimicrobial Agents of Coagulase-Negative Staphylococcus Strains Isolated from Blood Cultures

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作者
Nava Teran, Karelis Lilibeth [1 ]
Sanchez Galvis, Dalialba Maria [1 ]
Colina Lopez, Gladis [2 ]
Valero Leal, Kutchynskaya [3 ]
机构
[1] Univ Zulia, Escuela Bioanal, Maracaibo 4011, Venezuela
[2] Univ Zulia, Escuela Bioanal, Bacteriol Lab, Maracaibo 4011, Venezuela
[3] Univ Zulia, Escuela Bioanal, Catedra Bacteriol Clin, Maracaibo 4011, Venezuela
关键词
Coagulase-negative; staphylococcus; enterotoxins; biofilm; resistance; blood culture; INTENSIVE-CARE-UNIT; SLIME PRODUCTION; ICAD GENES; BACTEREMIA; AUREUS;
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摘要
Coagulase-negative staphylococci (CNS) have been identified as the etiological agent in various infections and are currently the microorganisms most frequently isolated in blood cultures. However, little is known about the virulence factors produced by CNS that contribute to the pathogenesis of infections caused by these microorganisms. This study was designed to determine the production of staphylococcal enterotoxins, biofilm production and resistance to antimicrobial agents. For this purpose, a total of 48CNS strains isolated from blood cultures at the University Hospital in Maracaibo, Zulia, Venezuela, were studied. Staphylococcal enterotoxins were detected by reversed passive latex agglutination. Biofilm production was assessed in a quantitative assay using a microtiter-plate. Susceptibility against antimicrobial agents was tested by the disk diffusion method. Six strains of staphylococci isolates (12.5%) were found to be enterotoxigenic. Of these, 3 strains were positive for staphylococcal enterotoxin D (SED), 2 for SEA and 1 of the isolates was positive for SEB, SEC and SED.Twenty-one isolates (44%) were found to be biofilm producers. A high frequency of resistance was observed with oxacillin (90%), gentamicin (83%) and erythromycin (67%). None of the isolates showed resistance to vancomycin. Taking into consideration that the etiological importance of CNS has often been neglected, the present investigation confirmed that these microorganisms should not be ignored or classified as mere contaminants.
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页码:106 / 114
页数:9
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