attachment and survival of escherichia coli o157:h7 on in-shell hazelnuts

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ID: 227755
2018
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Abstract
The multistate Escherichia coli (E. coli) O157:H7 outbreak associated with in-shell hazelnuts highlights the pathogen’s ability to involve non-traditional vehicles in foodborne infections. Furthermore, it underscores significant gaps in our knowledge of pathogen survivability and persistence on nuts. Therefore, this study investigated the ability of E. coli O157:H7 to attach and survive on in-shell hazelnuts. In-shell hazelnuts were inoculated with a four-strain mixture of E. coli O157:H7 at 7.6 log colony forming units (CFU)/nut by wet or dry inoculation, stored at ambient conditions (24 ± 1 °C; 40% ± 3% relative humidity (RH) and sampled for twelve months. For the attachment assay, in-shell hazelnuts were inoculated and the adherent population was enumerated at 30 s−1 h following inoculation. Irrespective of the inoculation method, ~5 log CFU of adherent E. coli O157:H7 was recovered from the hazelnuts as early as 30 s after inoculation. Conversely, pathogen survival was significantly reduced under dry inoculation with samples being enrichment negative after five months of storage (p < 0.05). On the other hand, wet inoculation led to a significantly longer persistence of the pathogen with ~3 log CFU being recovered from the in-shell nuts at 12 months of storage (p < 0.05). These results indicate that E. coli O157:H7 can survive in significant numbers on in-shell hazelnuts when stored under ambient conditions.
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feng2018internationalattachment Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Lingyu Feng, Muhammed S. Muyyarikkandy, Stephanie R. B. Brown, Mary Anne Amalaradjou
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Journal archives of biochemistry and biophysics
Year 2018
DOI
10.3390/ijerph15061122
URL
http://www.mdpi.com/1660-4601/15/6/1122
Keywords
gene expression survival attachment escherichia coli o157:h7

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