Molecular Screening, Isolation, and Characterization of Enterohemorrhagic Escherichia coli O157:H7 from Retail Shrimp

Foodborne outbreaks attributed to the contamination of foods with enterohemorrhagic Escherichia coli (EHEC) O157:H7 are a growing global concern. Fish and shrimp samples obtained from different retail fish markets in Cochin, India, were screened by direct PCR assays targeting three important virulen...

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Veröffentlicht in:Journal of food protection 2010, Vol.73 (1), p.97-103
Hauptverfasser: Surendraraj, Alagarsamy, Thampuran, Nirmala, Joseph, Toms C
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Joseph, Toms C
description Foodborne outbreaks attributed to the contamination of foods with enterohemorrhagic Escherichia coli (EHEC) O157:H7 are a growing global concern. Fish and shrimp samples obtained from different retail fish markets in Cochin, India, were screened by direct PCR assays targeting three important virulence markers of EHEC, the intimin protein (eaeA gene), enterohemolysin (hlyA gene), and Shiga toxin (stx gene). One shrimp (Fenneropenaeus indicus) sample was positive for all these virulence markers, and seven typical E. coli O157:H7 isolates were recovered from the marker-positive shrimp sample. This is the first report of recovery of typical E. coli O157:H7 from fish or shellfish in India. All the typical EHEC isolates had a characteristic reaction in eosin methylene blue agar and belonged to IMViC (indole, methyl red, Voges Proskauer, Simmons citrate reactions) biotype I. These isolates also were negative for sorbitol and methylumbelliferyl-β-glucuronide and exhibited β-hemolytic activity. One isolate showed self-agglutination for E. coli O157 antisera and produced a false-positive reaction with CHROMagar O157. These typical EHEC isolates belonged to a restricted biotype group and had a very low multiple antibiotic resistance index. Isolation of E. coli O157:H7 in fish and shellfish indicates that strict adherence to hygienic handling methods and proper cooking or processing is needed before consumption of these products.
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Psychology ; Genes ; hemolysis ; Humans ; India ; isolation ; microbial detection ; Molecular biology ; molecular systematics ; Penaeidae - microbiology ; Polymerase Chain Reaction ; raw fish ; retail marketing ; ribotypes ; seafoods ; serotypes ; Shellfish ; Shellfish - microbiology ; shrimp ; Toxins ; Virulence ; Virulence Factors - analysis ; Virulence Factors - genetics ; virulence genes</subject><ispartof>Journal of food protection, 2010, Vol.73 (1), p.97-103</ispartof><rights>2015 INIST-CNRS</rights><rights>Copyright International Association for Food Protection Jan 2010</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c392t-797e7d0be0e8e21a46df694ab0d922eeacc5f1c6dd3ac94af3411f153e70a5ac3</citedby><cites>FETCH-LOGICAL-c392t-797e7d0be0e8e21a46df694ab0d922eeacc5f1c6dd3ac94af3411f153e70a5ac3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,4010,27900,27901,27902</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&amp;idt=22336714$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/20051211$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Surendraraj, Alagarsamy</creatorcontrib><creatorcontrib>Thampuran, Nirmala</creatorcontrib><creatorcontrib>Joseph, Toms C</creatorcontrib><title>Molecular Screening, Isolation, and Characterization of Enterohemorrhagic Escherichia coli O157:H7 from Retail Shrimp</title><title>Journal of food protection</title><addtitle>J Food Prot</addtitle><description>Foodborne outbreaks attributed to the contamination of foods with enterohemorrhagic Escherichia coli (EHEC) O157:H7 are a growing global concern. Fish and shrimp samples obtained from different retail fish markets in Cochin, India, were screened by direct PCR assays targeting three important virulence markers of EHEC, the intimin protein (eaeA gene), enterohemolysin (hlyA gene), and Shiga toxin (stx gene). One shrimp (Fenneropenaeus indicus) sample was positive for all these virulence markers, and seven typical E. coli O157:H7 isolates were recovered from the marker-positive shrimp sample. This is the first report of recovery of typical E. coli O157:H7 from fish or shellfish in India. All the typical EHEC isolates had a characteristic reaction in eosin methylene blue agar and belonged to IMViC (indole, methyl red, Voges Proskauer, Simmons citrate reactions) biotype I. These isolates also were negative for sorbitol and methylumbelliferyl-β-glucuronide and exhibited β-hemolytic activity. One isolate showed self-agglutination for E. coli O157 antisera and produced a false-positive reaction with CHROMagar O157. These typical EHEC isolates belonged to a restricted biotype group and had a very low multiple antibiotic resistance index. Isolation of E. coli O157:H7 in fish and shellfish indicates that strict adherence to hygienic handling methods and proper cooking or processing is needed before consumption of these products.</description><subject>Animals</subject><subject>Antibiotic resistance</subject><subject>bacterial contamination</subject><subject>Biological and medical sciences</subject><subject>biotypes</subject><subject>Colony Count, Microbial</subject><subject>Consumer Product Safety</subject><subject>E coli</subject><subject>enrichment culture</subject><subject>enterohemorrhagic Escherichia coli</subject><subject>Enzymes</subject><subject>Epidemics</subject><subject>Escherichia coli O157 - classification</subject><subject>Escherichia coli O157 - genetics</subject><subject>Escherichia coli O157 - isolation &amp; purification</subject><subject>Escherichia coli O157:H7</subject><subject>Fenneropenaeus indicus</subject><subject>Fish</subject><subject>Fish and seafood industries</subject><subject>Food contamination &amp; poisoning</subject><subject>Food Contamination - analysis</subject><subject>Food Handling - methods</subject><subject>Food industries</subject><subject>Food Microbiology</subject><subject>food pathogens</subject><subject>Food safety</subject><subject>Fundamental and applied biological sciences. 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Fish and shrimp samples obtained from different retail fish markets in Cochin, India, were screened by direct PCR assays targeting three important virulence markers of EHEC, the intimin protein (eaeA gene), enterohemolysin (hlyA gene), and Shiga toxin (stx gene). One shrimp (Fenneropenaeus indicus) sample was positive for all these virulence markers, and seven typical E. coli O157:H7 isolates were recovered from the marker-positive shrimp sample. This is the first report of recovery of typical E. coli O157:H7 from fish or shellfish in India. All the typical EHEC isolates had a characteristic reaction in eosin methylene blue agar and belonged to IMViC (indole, methyl red, Voges Proskauer, Simmons citrate reactions) biotype I. These isolates also were negative for sorbitol and methylumbelliferyl-β-glucuronide and exhibited β-hemolytic activity. One isolate showed self-agglutination for E. coli O157 antisera and produced a false-positive reaction with CHROMagar O157. These typical EHEC isolates belonged to a restricted biotype group and had a very low multiple antibiotic resistance index. Isolation of E. coli O157:H7 in fish and shellfish indicates that strict adherence to hygienic handling methods and proper cooking or processing is needed before consumption of these products.</abstract><cop>Des Moines, IA</cop><pub>International Association for Food Protection</pub><pmid>20051211</pmid><doi>10.4315/0362-028X-73.1.97</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record>
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source MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection
subjects Animals
Antibiotic resistance
bacterial contamination
Biological and medical sciences
biotypes
Colony Count, Microbial
Consumer Product Safety
E coli
enrichment culture
enterohemorrhagic Escherichia coli
Enzymes
Epidemics
Escherichia coli O157 - classification
Escherichia coli O157 - genetics
Escherichia coli O157 - isolation & purification
Escherichia coli O157:H7
Fenneropenaeus indicus
Fish
Fish and seafood industries
Food contamination & poisoning
Food Contamination - analysis
Food Handling - methods
Food industries
Food Microbiology
food pathogens
Food safety
Fundamental and applied biological sciences. Psychology
Genes
hemolysis
Humans
India
isolation
microbial detection
Molecular biology
molecular systematics
Penaeidae - microbiology
Polymerase Chain Reaction
raw fish
retail marketing
ribotypes
seafoods
serotypes
Shellfish
Shellfish - microbiology
shrimp
Toxins
Virulence
Virulence Factors - analysis
Virulence Factors - genetics
virulence genes
title Molecular Screening, Isolation, and Characterization of Enterohemorrhagic Escherichia coli O157:H7 from Retail Shrimp
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