ORBi: Delhalle Laurent - Retrospective Analysis of a Listeria monocytogenes Contamination Episode in Raw Milk Goat Cheese Using Quantitative Microbial Risk Assessment tools

Reference : Retrospective Analysis of a Listeria monocytogenes Contamination Episode in Raw Milk Goa...


	Document type :	Scientific journals : Article
	Discipline(s) :	Life sciences : Food science
	To cite this reference:	http://hdl.handle.net/2268/135901

Title :	Retrospective Analysis of a Listeria monocytogenes Contamination Episode in Raw Milk Goat Cheese Using Quantitative Microbial Risk Assessment tools
Language :	English
Author, co-author :	Delhalle, Laurent [Université de Liège - ULg > Département de sciences des denrées alimentaires > Microbiologie des denrées alimentaires >]
	Ellouze, Mariem [IFIP (French Institute for Pig and Pork Products) > Fresh and Processed Meats Department > > > >]
	Yde, Marc [Scientific Institute of Public Health > Bacteriology Section > > > >]
	Clinquart, Antoine [Université de Liège - ULg > Département de sciences des denrées alimentaires > Technologie des denrées alimentaires >]
	Daube, Georges [Université de Liège - ULg > Département de sciences des denrées alimentaires > Microbiologie des denrées alimentaires >]
	Korsak Koulagenko, Nicolas [Université de Liège - ULg > Département de sciences des denrées alimentaires > Département de sciences des denrées alimentaires >]
Publication date :	Dec-2012
Journal title :	Journal of Food Protection
Publisher :	International Association for Food Protection
Volume :	75
Issue/season :	12
Pages :	2122-2135
Peer reviewed :	Yes (verified by ORBi)
ISSN :	0362-028X
City :	Des Moines
Country :	IA
Keywords :	[en] Exposure assessment ; goat-cheese ; L. monocytogenes ; sensitivity analysis ; risk mitigation
Abstract :	[en] In 2005, the Belgian authorities reported a Listeria monocytogenes contamination episode in cheese made from raw goat's milk. The presence of an asymptomatic shedder goat in the herd caused this contamination. On the basis of data collected at the time of the episode, a retrospective study was performed using an exposure assessment model covering the production chain from the milking of goats up to delivery of cheese to the market. Predictive microbiology models were used to simulate the growth of L. monocytogenes during the cheese process in relation with temperature, pH, and water activity. The model showed significant growth of L. monocytogenes during chilling and storage of the milk collected the day before the cheese production (median increase of 2.2 log CFU/ml) and during the addition of starter and rennet to milk (median increase of 1.2 log CFU/ml). The L. monocytogenes concentration in the fresh unripened cheese was estimated to be 3.8 log CFU/g (median). This result is consistent with the number of L. monocytogenes in the fresh cheese (3.6 log CFU/g) reported during the cheese contamination episode. A variance-based method sensitivity analysis identified the most important factors impacting the cheese contamination, and a scenario analysis then evaluated several options for risk mitigation. Thus, by using quantitative microbial risk assessment tools, this study provides reliable information to identify and control critical steps in a local production chain of cheese made from raw goat's milk.
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/2268/135901
DOI :	10.4315/0362-028X.JFP-12-074

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