Bacterial Flora and Antimicrobial Resistance in Raw Frozen Cultured Seafood Imported to Denmark

Intensified aquaculture includes the use of antimicrobials for disease control. In contrast to the situation in livestock, Escherichia coli and enterococci are not part of the normal gastrointestinal flora of fish and shrimp and therefore not suitable indicators of antimicrobial resistance in seafoo...

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Veröffentlicht in:Journal of food protection 2013-03, Vol.76 (3), p.490-499
Hauptverfasser: Noor Uddin, Gazi M, Larsen, Marianne Halberg, Guardabassi, Luca, Dalsgaard, Anders
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Dalsgaard, Anders
description Intensified aquaculture includes the use of antimicrobials for disease control. In contrast to the situation in livestock, Escherichia coli and enterococci are not part of the normal gastrointestinal flora of fish and shrimp and therefore not suitable indicators of antimicrobial resistance in seafood. In this study, the diversity and phenotypic characteristics of the bacterial flora in raw frozen cultured and wild-caught shrimp and fish were evaluated to identify potential indicators of antimicrobial resistance. The bacterial flora cultured on various agar media at different temperatures yielded total viable counts of 4.0 × 10(4) to 3.0 × 10(5) CFU g-1. Bacterial diversity was indicated by 16S rRNA sequence analysis of 84 isolates representing different colony types; 24 genera and 51 species were identified. Pseudomonas spp. (23% of isolates), Psychrobacter spp. (17%), Serratia spp. (13%), Exiguobacterium spp. (7%), Staphylococcus spp. (6%), and Micrococcus spp. (6%) dominated. Disk susceptibility testing of 39 bacterial isolates to 11 antimicrobials revealed resistance to ampicillin, amoxicillin-clavulanic acid, erythromycin, and third generation cephalosporins. Resistance to third generation cephalosporins was found in Pseudomonas, a genus naturally resistant to most β-lactam antibiotics, and in Staphylococcus hominis. Half of the isolates were susceptible to all antimicrobials tested. Results indicate that identification of a single bacterial resistance indicator naturally present in seafood at point of harvest is unlikely. The bacterial flora found likely represents a processing rather than a raw fish flora because of repeated exposure of raw material to water during processing. Methods and appropriate indicators, such as quantitative PCR of resistance genes, are needed to determine how antimicrobials used in aquaculture affect resistance of bacteria in retailed products.
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In contrast to the situation in livestock, Escherichia coli and enterococci are not part of the normal gastrointestinal flora of fish and shrimp and therefore not suitable indicators of antimicrobial resistance in seafood. In this study, the diversity and phenotypic characteristics of the bacterial flora in raw frozen cultured and wild-caught shrimp and fish were evaluated to identify potential indicators of antimicrobial resistance. The bacterial flora cultured on various agar media at different temperatures yielded total viable counts of 4.0 × 10(4) to 3.0 × 10(5) CFU g-1. Bacterial diversity was indicated by 16S rRNA sequence analysis of 84 isolates representing different colony types; 24 genera and 51 species were identified. Pseudomonas spp. (23% of isolates), Psychrobacter spp. (17%), Serratia spp. (13%), Exiguobacterium spp. (7%), Staphylococcus spp. (6%), and Micrococcus spp. (6%) dominated. 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Methods and appropriate indicators, such as quantitative PCR of resistance genes, are needed to determine how antimicrobials used in aquaculture affect resistance of bacteria in retailed products.</description><identifier>ISSN: 0362-028X</identifier><identifier>EISSN: 1944-9097</identifier><identifier>DOI: 10.4315/0362-028X.JFP-12-402</identifier><identifier>PMID: 23462087</identifier><identifier>CODEN: JFPRDR</identifier><language>eng</language><publisher>Des Moines, IA: International Association for Food Protection</publisher><subject>agar ; ampicillin ; Animals ; Anti-Bacterial Agents - pharmacology ; antibiotic resistance ; Antibiotics ; Antimicrobial agents ; Aquaculture ; Bacteria ; Bacteria - drug effects ; Bacteria - growth &amp; development ; Biological and medical sciences ; cephalosporins ; Colony Count, Microbial ; Consumer Product Safety ; Consumption ; Denmark ; Disease control ; Dose-Response Relationship, Drug ; Drug resistance ; Drug Resistance, Bacterial - genetics ; Drug Resistance, Multiple, Bacterial ; E coli ; Enterococcus ; erythromycin ; Escherichia coli ; Exiguobacterium ; Feces ; Fish ; Fish and seafood industries ; Fishes - microbiology ; Flora ; Food Handling - methods ; Food industries ; Food microbiology ; Food safety ; Frozen Foods - analysis ; Frozen Foods - microbiology ; Frozen Foods - standards ; Fundamental and applied biological sciences. Psychology ; gastrointestinal system ; genes ; Humans ; Livestock ; Microbial Sensitivity Tests ; Micrococcus ; Morphology ; nucleotide sequences ; Pathogens ; Pseudomonas ; Psychrobacter ; quantitative polymerase chain reaction ; raw fish ; raw materials ; ribosomal RNA ; Seafood ; Seafood - analysis ; Seafood - microbiology ; Seafood - standards ; sequence analysis ; Serratia ; Shellfish ; shrimp ; Staphylococcus hominis ; temperature ; Yeast</subject><ispartof>Journal of food protection, 2013-03, Vol.76 (3), p.490-499</ispartof><rights>2014 INIST-CNRS</rights><rights>Copyright Allen Press Publishing Services Mar 2013</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c435t-3d34542dadabae7e7597a3727b5da8370e99422a51b8163a7205eca87b7d305f3</citedby><cites>FETCH-LOGICAL-c435t-3d34542dadabae7e7597a3727b5da8370e99422a51b8163a7205eca87b7d305f3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.proquest.com/docview/1316602139?pq-origsite=primo$$EHTML$$P50$$Gproquest$$H</linktohtml><link.rule.ids>314,780,784,27924,27925,64385,64389,72469</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&amp;idt=27058379$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/23462087$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Noor Uddin, Gazi M</creatorcontrib><creatorcontrib>Larsen, Marianne Halberg</creatorcontrib><creatorcontrib>Guardabassi, Luca</creatorcontrib><creatorcontrib>Dalsgaard, Anders</creatorcontrib><title>Bacterial Flora and Antimicrobial Resistance in Raw Frozen Cultured Seafood Imported to Denmark</title><title>Journal of food protection</title><addtitle>J Food Prot</addtitle><description>Intensified aquaculture includes the use of antimicrobials for disease control. In contrast to the situation in livestock, Escherichia coli and enterococci are not part of the normal gastrointestinal flora of fish and shrimp and therefore not suitable indicators of antimicrobial resistance in seafood. In this study, the diversity and phenotypic characteristics of the bacterial flora in raw frozen cultured and wild-caught shrimp and fish were evaluated to identify potential indicators of antimicrobial resistance. The bacterial flora cultured on various agar media at different temperatures yielded total viable counts of 4.0 × 10(4) to 3.0 × 10(5) CFU g-1. Bacterial diversity was indicated by 16S rRNA sequence analysis of 84 isolates representing different colony types; 24 genera and 51 species were identified. Pseudomonas spp. (23% of isolates), Psychrobacter spp. (17%), Serratia spp. (13%), Exiguobacterium spp. (7%), Staphylococcus spp. (6%), and Micrococcus spp. (6%) dominated. Disk susceptibility testing of 39 bacterial isolates to 11 antimicrobials revealed resistance to ampicillin, amoxicillin-clavulanic acid, erythromycin, and third generation cephalosporins. Resistance to third generation cephalosporins was found in Pseudomonas, a genus naturally resistant to most β-lactam antibiotics, and in Staphylococcus hominis. Half of the isolates were susceptible to all antimicrobials tested. Results indicate that identification of a single bacterial resistance indicator naturally present in seafood at point of harvest is unlikely. The bacterial flora found likely represents a processing rather than a raw fish flora because of repeated exposure of raw material to water during processing. 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Disk susceptibility testing of 39 bacterial isolates to 11 antimicrobials revealed resistance to ampicillin, amoxicillin-clavulanic acid, erythromycin, and third generation cephalosporins. Resistance to third generation cephalosporins was found in Pseudomonas, a genus naturally resistant to most β-lactam antibiotics, and in Staphylococcus hominis. Half of the isolates were susceptible to all antimicrobials tested. Results indicate that identification of a single bacterial resistance indicator naturally present in seafood at point of harvest is unlikely. The bacterial flora found likely represents a processing rather than a raw fish flora because of repeated exposure of raw material to water during processing. 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subjects agar
ampicillin
Animals
Anti-Bacterial Agents - pharmacology
antibiotic resistance
Antibiotics
Antimicrobial agents
Aquaculture
Bacteria
Bacteria - drug effects
Bacteria - growth & development
Biological and medical sciences
cephalosporins
Colony Count, Microbial
Consumer Product Safety
Consumption
Denmark
Disease control
Dose-Response Relationship, Drug
Drug resistance
Drug Resistance, Bacterial - genetics
Drug Resistance, Multiple, Bacterial
E coli
Enterococcus
erythromycin
Escherichia coli
Exiguobacterium
Feces
Fish
Fish and seafood industries
Fishes - microbiology
Flora
Food Handling - methods
Food industries
Food microbiology
Food safety
Frozen Foods - analysis
Frozen Foods - microbiology
Frozen Foods - standards
Fundamental and applied biological sciences. Psychology
gastrointestinal system
genes
Humans
Livestock
Microbial Sensitivity Tests
Micrococcus
Morphology
nucleotide sequences
Pathogens
Pseudomonas
Psychrobacter
quantitative polymerase chain reaction
raw fish
raw materials
ribosomal RNA
Seafood
Seafood - analysis
Seafood - microbiology
Seafood - standards
sequence analysis
Serratia
Shellfish
shrimp
Staphylococcus hominis
temperature
Yeast
title Bacterial Flora and Antimicrobial Resistance in Raw Frozen Cultured Seafood Imported to Denmark
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