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Listeria monocytogenes is a major public health concern. It has been associated with highly mediatised outbreaks. It was the case in 2008, when an important episode (23 deaths) in Canada showed the need to reinforce the policies to better control Listeria in ready-to-eat products. Improved surveillance in the production plants environment increased the detection levels and represents a challenge for both industries and control agencies. In Canada, there is currently no surveillance policy of this microorganism in the steps preceeding ready-to-eat production. The distribution, diversity and characterisation of this microorganism in the slaughter and cutting environments are not well documented either. The aim of the present study is to provide such data, starting with a plant in Quebec. Moreover, recent studies suggested that the ability to produce biofilm and some virulence attributes (presence of SNP in InlA) are linked with “environmental” strains compared to virulent ones. Such characterization will be presented. The plant was sampled at three occasions, after the cleaning and disinfecting procedures, during a two-year period. A total of 874 samples were collected. Listeria detection followed the Health Canada standard method, geno-serogrouping was obtained by PCR and isolates were compared by PFGE after Apa1 and Asc1 restriction. Four serogroups (mainly I/IIb) were found, and 6 out of 21 pulsotypes were regularly or sporadically associated to human clinical strains profiles. We observed an increase in occurence of Listeria monocytogenes following the processing steps (χ2 p<0.05). On the contrary, the diversity strongly and repeatedly decrease from step to step : 96.1% of the strains recovered from the cutting room presented the same profile. The “resident strains” have not been represented in clinical cases surveillance. Biofilm formation ability of strains alone could not explain strain transitions. Our results indicate that better knowledge of Listeria monocytogenes before food processing could be helpfull to optimise Listeria monocytogenes control under a risk analyse approach.

international conference on the epidemiology and control of biological, chemical and physical hazards in pigs and pork

Data on distribution and characterization of Listeria monocytogenes strains in a pork slaughter and cutting plant in Quebec support an earlier surveillance in the meat production chain