Document Detail

Detection of enterotoxigenic Staphylococcus aureus isolates in raw milk cheese.
MedLine Citation:
PMID:  17916131     Owner:  NLM     Status:  MEDLINE    
AIM: To develop an easy, rapid and efficient DNA extraction procedure for Staphylococcus aureus detection with a low number of steps and removing completely the PCR inhibitors, applicable to raw milk cheese samples, and to compare phenotypical and genotypical method to detect Staph. aureus isolates and staphylococcal enterotoxins (SEs) production. METHODS AND RESULTS: A total of 33 bovine and caprine raw milk cheese samples were analysed by means of both classic microbiological and molecular techniques. All samples were positive for Staph. aureus contamination. The DNA extraction protocol optimized was found to achieve a detection limit of 100 CFU g(-1) for Staph. aureus. None of the samples tested with immunological assays contained SEs but in 14 of 33 samples a mixture of se positive (sea, sec, sed, seg, sel, sej) isolates were identified. CONCLUSIONS: Staphylococcus aureus is a food-borne pathogen mainly detected in finished dairy products. The rapid and efficient detection of Staph. aureus isolates from dairy products is essential for consumer safety. The direct detection of pathogens from food is possible with careful attention to sample preparation and nucleic acid amplification optimization. SIGNIFICANCE AND IMPACT OF THE STUDY: This study shows that raw milk cheese samples can be tested for Staph. aureus contamination with a rapid, simple and reproducible procedure.
P Cremonesi; G Perez; G Pisoni; P Moroni; S Morandi; M Luzzana; M Brasca; B Castiglioni
Publication Detail:
Type:  Comparative Study; Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-10-04
Journal Detail:
Title:  Letters in applied microbiology     Volume:  45     ISSN:  0266-8254     ISO Abbreviation:  Lett. Appl. Microbiol.     Publication Date:  2007 Dec 
Date Detail:
Created Date:  2007-11-23     Completed Date:  2008-01-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8510094     Medline TA:  Lett Appl Microbiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  586-91     Citation Subset:  IM    
Department of Biomedical Sciences and Technologies, University of Milan, Segrate, Milan, Italy.
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MeSH Terms
Bacteriological Techniques*
Cheese / microbiology*
DNA, Bacterial / genetics,  isolation & purification
Enterotoxins / biosynthesis*,  genetics
Polymerase Chain Reaction / methods*
Sensitivity and Specificity
Staphylococcus aureus / genetics,  isolation & purification*,  metabolism*
Reg. No./Substance:
0/DNA, Bacterial; 0/Enterotoxins

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