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Predicting growth rates and growth boundary of Listeria monocytogenes - An international validation study with focus on processed and ready-to-eat meat and seafood


Mejlholm, O and Gunvig, A and Borggaard, C and Blom-Hansen, J and Mellefont, LA and Ross, T and Leroi, F and Else, T and Visser, D and Dalgaard, P, Predicting growth rates and growth boundary of Listeria monocytogenes - An international validation study with focus on processed and ready-to-eat meat and seafood, International Journal of Food Microbiology, 141, (3) pp. 137-150. ISSN 0168-1605 (2010) [Refereed Article]

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DOI: doi:10.1016/j.ijfoodmicro.2010.04.026


The performance of six predictive models for Listeria monocytogenes was evaluated using 1014 growth responses of the pathogen in meat, seafood, poultry and dairy products. The performance of the growth models was closely related to their complexity i.e. the number of environmental parameters they take into account. The most complex model included the effect of nine environmental parameters and it performed better than the other less complex models both for prediction of maximum specific growth rates (µmax values) and for the growth boundary of L. monocytogenes. For this model bias and accuracy factors for growth rate predictions were 1.0 and 1.5, respectively, and 89% of the growth/no-growth responses were correctly predicted. The performance of three other models, including the effect of five to seven environmental parameters, was considered acceptable with bias factors of 1.2 to 1.3. These models all included the effect of acetic acid/diacetate and lactic acid, one of the models also included the effect of CO2 and nitrite but none of these models included the effect of smoke components. Less complex models that did not include the effect of acetic acid/diacetate and lactic acid were unable to accurately predict growth responses of L. monocytogenes in the wide range of food evaluated in the present study. When complexity of L. monocytogenes growth models matches the complexity of foods of interest, i.e. the number of hurdles to microbial growth, then predicted growth responses of the pathogen can be accurate. The successfully validated models are useful for assessment and management of L. monocytogenes in processed and ready-to-eat (RTE) foods.

Item Details

Item Type:Refereed Article
Keywords:Predictive models; Bias and accuracy factors; Correct prediction percentage; Growth/no-growth predictions; Psi (ø) value
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Food sciences
Research Field:Food packaging, preservation and processing
Objective Division:Manufacturing
Objective Group:Processed food products and beverages (excl. dairy products)
Objective Field:Carcass meat (incl. fish and seafood)
UTAS Author:Mellefont, LA (Dr Lyndal Mellefont)
UTAS Author:Ross, T (Professor Tom Ross)
ID Code:59589
Year Published:2010
Web of Science® Times Cited:89
Deposited By:Agricultural Science
Deposited On:2009-12-14
Last Modified:2011-04-14

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