ENTEROTOXIN AND SLIME GENE DETECTION IN Staphylococcus COAGULASE NEGATIVE ISOLATED FROM GROUND BEEF
2018
Among the meat products, ground beef presents a greater risk of contamination, due to excessive manipulation and greater surface contact. Staphylococcus indicates inadequate hygienic-sanitary conditions of food. Coagulase-negative Staphylococci (CoNS) cover most of the existing staphylococci species and among the virulence factors presented by this group, biofilm production and staphylococcal enterotoxins (SE) are the most prominent. The objective of this study was to detect the presence of enterotoxin and biofilm genes in coagulase-negative Staphylococci isolates obtained from ground beef samples. Twenty four strains of CoNS isolated from fresh bovine meat, phenotypically characterized as biofilm producers, were used. The samples were collected in twenty four commercial establishments (butchers and supermarkets) in Umuarama City from Parana State, Brazil. The CoNS count found was between 1.0 x 10³ and 3.8 x 10 5 CFU/g of food. All 24 samples showed genes belonging to the ica operon , 21 (87.50%) carrying the ica A, ica C and ica D genes and 3 (12.50%) of the ica A and ica D genes. 95.83% (23/24) of the strains were carriers of the sea enterotoxin gene, being 9 (37.5%) only sea , one (4.2%) sea and seb , 7 (29.1%) sea and see and 6 (25.0%) sea , seb and see . One (4.2%) strain did not show any of the enterotoxin genes. The detection of enterotoxin and biofilm genes in CoNS demonstrate the pathogenic potential of this microorganism. The lack of epidemiological data neglects the actual fault of the CoNS in foodborne diseases.
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