Reference : Case study of contamination by Listeria monocytogenes in raw goat milk cheese: develo...
Scientific congresses and symposiums : Unpublished conference
Life sciences : Agriculture & agronomy
http://hdl.handle.net/2268/134882
Case study of contamination by Listeria monocytogenes in raw goat milk cheese: development of a quantitative risk assessment model of the production chain
English
Korsak Koulagenko, Nicolas mailto [Université de Liège - ULg > Département de sciences des denrées alimentaires > Département de sciences des denrées alimentaires >]
Delhalle, Laurent mailto [Université de Liège - ULg > Département de sciences des denrées alimentaires > Microbiologie des denrées alimentaires >]
Daube, Georges mailto [Université de Liège - ULg > Département de sciences des denrées alimentaires > Microbiologie des denrées alimentaires >]
3-Aug-2011
Yes
No
International
AFP 2011
31/07 - 03/08/2011
International Association of Food Protection
Milwaukee
WI
[en] Risk analysis ; Listeria monocytogenes ; raw milk
[en] Introduction: Quantitative Risk assessment could be applied in industries as a tool to control and manage the safety of food products.
Purpose: A contamination by Listeria monocytogenes of cheeses made from raw milk was reported by the Belgian food agency. This contamination was caused by the presence of an asymptomatic “shedder” goat in the herd. With field and laboratory collected data, a quantitative risk assessment model of the production chain was developed.
Methods: A modular risk model was built to simulate the food production pathway covering the milking of goats until the final product for the customers. A dynamic square root model was used to predict the growth rate in relation with the temperature, the pH and the water activity along the production chain with predictive microbiology modules.
Results: The shedder goat was identified from the herd and milk samples were taken from the two different parts of the mammary gland with 2.6 log cfu (colonies forming units) Listeria monocytogenes/ml for the right part and absence in 25 ml for the left part of the mammary gland. Numbering of Listeria monocytogenes was carried out on the final products with 3.6 log cfu/g in the fresh not ripened cheeses. The modular risk assessment shows a significant growth of Listeria monocytogenes during chilling and storage of the milk collected the day before the cheese production (increase of 0.6 log cfu/ml) and during adjunction of ferment and rennet to milk (increase of 0.8 log cfu/ml). The model confirms the results obtained in the final products.
Significance: The modular risk model gives valuable informations to identify and to control critical steps in the food production chain of goat cheese made from raw milk. Only one shedder goat can cause a high risk to become ill for the consumers of contaminated products.
http://hdl.handle.net/2268/134882
http://www.foodprotection.org/events/iafp-annual-meeting/2011/

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