Antimicrobial resistance in diarrheagenic Escherichia coli from ready-to-eat foods
Certain subgroups of Escherichia coli have congenital or acquired virulence properties that allow them to cause a wide spectrum of disease. The aim of this study was to investigate the occurrence of diarrheagenic E. coli strains in ready-to-eat (RTE) foods produced in institutional, commercial and h...
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Published in | Journal of food science and technology Vol. 54; no. 11; pp. 3612 - 3619 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
New Delhi
Springer India
01.10.2017
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Certain subgroups of
Escherichia coli
have congenital or acquired virulence properties that allow them to cause a wide spectrum of disease. The aim of this study was to investigate the occurrence of diarrheagenic
E. coli
strains in ready-to-eat (RTE) foods produced in institutional, commercial and hotel restaurants in Salvador, Brazil. The presence of virulent isolates and antimicrobial resistance were evaluated. Four hundred forty-six samples were collected and grouped into cereals and vegetables, meat-based preparations, cooked salads, raw salads, garnishes, soups and sauces, desserts and juices.
E. coli
were detected using the most probable number method, the presence of virulence factors in isolates was determined by polymerase chain reaction (PCR) assays, and antibiotic resistance was analyzed using the disc diffusion method. In total, 15 isolates (3.1%) of
E. coli
were recovered; raw salads had the highest detection rate, 1.4%, followed by cooked salads, 0.8%; meat-based preparations, 0.4%; and cereals and vegetables, 0.4%. PCR assays showed that none of the isolates had the virulence genes
cnf1, cnf2, eae
,
sta, lt1, stx1, stx2
or
cdtB
. The isolates showed resistance to nine antibiotics of the 15 tested, and the highest levels of resistance were found for sulfamethoxazole/trimethoprim, tetracycline, ampicillin, and chloramphenicol (13.3% of isolates for each antibiotic). One isolate from cooked salad had plasmid-mediated multidrug resistance to tetracycline, trimethoprim/sulfamethoxazole, ampicillin and chloramphenicol. These results suggest that RTE foods, especially raw salads, can be reservoirs of
E. coli
and facilitate the spread of antibiotic resistance genes to the gastrointestinal microbiota of humans. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0022-1155 0975-8402 |
DOI: | 10.1007/s13197-017-2820-4 |