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Croissance d'Escherichia coli O157:H7 dans les tissus de pommes (Malus domestica) ayant subi des chocs : influence du cultivar, de la date de récolte et de l'origine de la bactérie.

Growth of Escherichia coli O157:H7 in bruised apple (Malus domestica) tissue as influenced by cultivar, date of harvest, and source.

Auteurs : DINGMAN D. W.

Type d'article : Article

Résumé

Four of five apple cultivars (Golden Delicious, Red Delicious, McIntosh, Macoun, and Melrose) inoculated with Escherichia coli O157:H7 promoted growth of the bacterium in bruised tissue independent of the date of harvest (i.e. degree of apple ripening) or the source of the apple (i.e. tree-picked or dropped fruit). Throughout this study, freshly picked (less than 2 days after harvest) McIntosh apples usually prevented the growth of E. coli O157:H7 for 2 days. Growth of E. coli O157:H7 did occur following 6 days of incubation in bruised McIntosh apple tissue. However, the maximum total cell number was approximately 80-fold less than the maximum total cell number recovered from Red Delicious apples. When fruit was stored for 1 month at 4 °C prior to inoculation with E. coli O157:H7, all five cultivars supported growth of the bacterium. For each apple cultivar, the pH of bruised tissue was significantly higher.

Détails

  • Titre original : Growth of Escherichia coli O157:H7 in bruised apple (Malus domestica) tissue as influenced by cultivar, date of harvest, and source.
  • Identifiant de la fiche : 2001-0821
  • Langues : Anglais
  • Source : Appl. environ. Microbiol. - vol. 66 - n. 3
  • Date d'édition : 03/2000

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