Persistence of Escherichia coli O157:H7 on Lettuce Plants following Spray Irrigation with Contaminated Water

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Abstract:

Irrigation water collected at farms growing crops for human consumption was artificially contaminated with E. coli O157: H7 and used to irrigate lettuce plants. Plants in a growth chamber were spray irrigated either once or intermittently with water contaminated with 102 or 104 CFU of E. coli O157:H7 per ml and were then sampled over a 30-day period. Only plants exposed to 102 CFU/ml on day 1 did not harbor the pathogen at the end of the sampling period. All other treatments resulted in contaminated plants at harvest. Plants irrigated with 104 CFU/ml contained high levels (up to 5 log CFU/g) of the pathogen at harvest. The results obtained in this study underscore the assertion that spray irrigation (the application of water directly to plant leaves) is linked to the contamination of crops and suggest that repeated exposure increases the E. coli O157:H7 level on the plant.

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Document Type: Research Article

Affiliations: Cook College, Department of Food Science, Rutgers, State University of New Jersey, 65 Dudley Road, New Brunswick, New Jersey 08901-8520, USA

Publication date: December 1, 2003

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    First published in 1937, the Journal of Food Protection®, is a refereed monthly publication. Each issue contains scientific research and authoritative review articles reporting on a variety of topics in food science pertaining to food safety and quality. The Journal is internationally recognized as the leading publication in the field of food microbiology with a readership exceeding 11,000 scientists from 70 countries. The Journal of Food Protection® is indexed in Index Medicus, Current Contents, BIOSIS, PubMed, Medline, and many others.

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