Assessment of microbial risk during Australian industrial practices for Escherichia coli O157:H7 in fresh cut-cos lettuce: A stochastic quantitative approach

Escherichia coli O157:H7 risk associated with the consumption of fresh cut-cos lettuce during Australian industrial practices was assessed. A probabilistic risk assessment model was developed and implemented in the @Risk software by using the Monte Carlo simulation technique with 1,000,000 iteration...

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Bibliographic Details
Published in:Food microbiology 2021-05, Vol.95, p.103691, Article 103691
Main Authors: Bozkurt, Hayriye, Bell, Tina, van Ogtrop, Floris, Phan-Thien, Kim-Yen, McConchie, Robyn
Format: Article
Language:English
Subjects:
Agricultural Irrigation
Australia
Colony Count, Microbial
Escherichia coli O157 - genetics
Escherichia coli O157 - growth & development
Escherichia coli O157 - isolation & purification
Food Contamination - analysis
Fresh Water - microbiology
Irrigation type
Irrigation water
Lactuca - growth & development
Lactuca - microbiology
Leafy greens
Manure - microbiology
Manure amended soil
Plant Leaves - microbiology
QMRA
Season
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Summary:Escherichia coli O157:H7 risk associated with the consumption of fresh cut-cos lettuce during Australian industrial practices was assessed. A probabilistic risk assessment model was developed and implemented in the @Risk software by using the Monte Carlo simulation technique with 1,000,000 iterations. Australian preharvest practices yielded predicted annual mean E. coli O157:H7 levels from 0.2 to −3.4 log CFU/g and prevalence values ranged from 2 to 6.4%. While exclusion of solar radiation from the baseline model yielded a significant increase in concentration of E. coli O157:H7 (−5.2 -log fold), drip irrigation usage, exclusion of manure amended soil and rainfall reduced E. coli O157:H7 levels by 7.4, 6.5, and 4.3-log fold, respectively. The microbial quality of irrigation water and irrigation type both had a significant effect on E. coli O157:H7 concentrations at harvest (p 
ISSN:0740-0020
1095-9998
DOI:10.1016/j.fm.2020.103691