Document Detail

Quantification and variability analysis of bacterial cross-contamination rates in common food service tasks.
MedLine Citation:
PMID:  11198444     Owner:  NLM     Status:  MEDLINE    
This study investigated bacterial transfer rates between hands and other common surfaces involved in food preparation in the kitchen. Nalidixic acid-resistant Enterobacter aerogenes B199A was used as a surrogate microorganism to follow the cross-contamination events. Samples from at least 30 different participants were collected to determine the statistical distribution of each cross-contamination rate and to quantify the natural variability associated with that rate. The transfer rates among hands, foods, and kitchen surfaces were highly variable, being as low as 0.0005% and as high as 100%. A normal distribution was used to describe the variability in the logarithm of the transfer rates. The mean +/- SD of the normal distributions were, in log percent transfer rate, chicken to hand (0.94 +/- 0.68), cutting board to lettuce (0.90 +/- 0.59), spigot to hand (0.36 +/- 0.90), hand to lettuce (-0.12 +/- 1.07), prewashed hand to postwashed hand (i.e., hand washing efficiency) (-0.20 +/- 1.42), and hand to spigot (-0.80 +/- 1.09). Quantifying the cross-contamination risk associated with various steps in the food preparation process can provide a scientific basis for risk management efforts in both home and food service kitchens.
Y Chen; K M Jackson; F P Chea; D W Schaffner
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of food protection     Volume:  64     ISSN:  0362-028X     ISO Abbreviation:  J. Food Prot.     Publication Date:  2001 Jan 
Date Detail:
Created Date:  2001-01-24     Completed Date:  2001-10-04     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7703944     Medline TA:  J Food Prot     Country:  United States    
Other Details:
Languages:  eng     Pagination:  72-80     Citation Subset:  IM    
Food Risk Analysis Initiative, Rutgers-the State University of New Jersey, New Brunswick 08901-8520, USA.
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MeSH Terms
Colony Count, Microbial
Enterobacter aerogenes*
Evaluation Studies as Topic
Food Contamination* / prevention & control
Food Handling*
Food Microbiology*
Hand / microbiology
Lettuce / microbiology
Meat / microbiology
Risk Management
Statistical Distributions

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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