Document Detail

Fate of Escherichia coli O157:H7 in field-inoculated lettuce.
MedLine Citation:
PMID:  21925023     Owner:  NLM     Status:  In-Data-Review    
Impact of drip and overhead sprinkler irrigation on the persistence of attenuated Escherichia coli O157:H7 in the lettuce phyllosphere was investigated using a split-plot design in four field trials conducted in the Salinas Valley, California, between summer 2007 and fall 2009. Rifampicin-resistant attenuated E. coli O157:H7 ATCC 700728 (BLS1) was inoculated onto the soil beds after seeding with a backpack sprayer or onto 2- or 4-week-old lettuce plant foliage with a spray bottle at a level of 7 log CFU ml(-1). When E. coli O157:H7 was inoculated onto 2-week-old plants, the organism was recovered by enrichment in 1 of 120 or 0 of 240 plants at 21 or 28 days post-inoculation, respectively. For the four trials where inoculum was applied to 4-week-old plants, the population size of E. coli O157:H7 declined rapidly and by day 7, counts were near or below the limit of detection (10 cells per plant) for 82% or more of the samples. However, in 3 out 4 field trials E. coli O157:H7 was still detected in lettuce plants by enrichment 4-weeks post-inoculation. Neither drip nor overhead sprinkler irrigation consistently influenced the survival of E. coli O157:H7 on lettuce.
Anne-Laure Moyne; Mysore R Sudarshana; Tyann Blessington; Steven T Koike; Michael D Cahn; Linda J Harris
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Publication Detail:
Type:  Journal Article     Date:  2011-02-11
Journal Detail:
Title:  Food microbiology     Volume:  28     ISSN:  1095-9998     ISO Abbreviation:  Food Microbiol.     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-09-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8601127     Medline TA:  Food Microbiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1417-25     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier Ltd. All rights reserved.
Department of Food Science and Technology, University of California, One Shields Ave., Davis, CA 95616-8598, USA; Western Institute for Food Safety and Security, University of California, One Shields Ave., Davis, CA 95616-8598, USA.
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