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pubmed-article:10849276pubmed:abstractTextA total of 120 minimally processed, cut and packaged lettuce samples were purchased from retail supermarkets or provided by a salad production facility over an 8-month period. The samples were tested for total aerobic plate counts and for the presence of potentially pathogenic species belonging to the genera of Listeria, Aeromonas and Yersinia. The aerobic plate counts ranged from 103 to 109 colony forming units (cfu) g-1. Most samples (76%) contained between 105 and 107 cfu g-1 total aerobic bacteria. Listeria monocytogenes was isolated from three samples, Aeromonas hydrophila or Aeromonas caviae from 66 samples, and Yersinia enterocolitica from 71 samples. The pathogenic potential of Y. enterocolitica isolates was determined by screening for an array of biochemical, serological and genetic traits (heat-stable enterotoxin gene, the attachment and invasion gene locus, the invasin gene locus and the virulence plasmid). The Y. enterocolitica isolates lacked many of the phenotypic and genetic markers associated with virulence in primary pathogenic strains. As the roles of the reputed virulence factors of Aeromonas spp. in human infection are uncertain, the pathogenic potential of the Aeromonas isolates in lettuce remains unclear.lld:pubmed
pubmed-article:10849276pubmed:languageenglld:pubmed
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pubmed-article:10849276pubmed:authorpubmed-author:SzaboE AEAlld:pubmed
pubmed-article:10849276pubmed:authorpubmed-author:BurrowsJ MJMlld:pubmed
pubmed-article:10849276pubmed:authorpubmed-author:ScurrahK JKJlld:pubmed
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pubmed-article:10849276pubmed:volume30lld:pubmed
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pubmed-article:10849276pubmed:pagination456-60lld:pubmed
pubmed-article:10849276pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:10849276pubmed:year2000lld:pubmed
pubmed-article:10849276pubmed:articleTitleSurvey for psychrotrophic bacterial pathogens in minimally processed lettuce.lld:pubmed
pubmed-article:10849276pubmed:affiliationFood Science Australia, North Ryde Laboratory, New South Wales and The Cooperative Research Centre for International Food Manufacture and Packaging Science, Hawthorn, Victoria, Australia. lisa.szabo@foodscience.afisc.csiro.aulld:pubmed
pubmed-article:10849276pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:10849276pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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