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Applied and Environmental Microbiology, July 2002, p. 3366-3370, Vol. 68, No. 7
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.7.3366-3370.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Prevalence and Fingerprinting of Listeria monocytogenes Strains Isolated from Raw Whole Milk in Farm Bulk Tanks and in Dairy Plant Receiving Tanks

Elisabet Waak,1* Wilhelm Tham,2 and Marie-Louise Danielsson-Tham2

Arla Foods Innovation, S-105 46 Stockholm,1 Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, S-750 07 Uppsala, Sweden2

Received 11 October 2001/ Accepted 10 April 2002

The incidence of Listeria species in raw whole milk from farm bulk tanks and from raw milk in storage at a Swedish dairy plant was studied. Listeria monocytogenes was found in 1.0% and Listeria innocua was found in 2.3% of the 294 farm bulk tank (farm tank) milk specimens. One farm tank specimen contained 60 CFU of L. monocytogenes ml-1. L. monocytogenes was detected in 19.6% and L. innocua was detected in 8.5% of the milk specimens from the silo receiving tanks at the dairy (dairy silos). More dairy silo specimens were positive for both Listeria species during winter than during summer. Restriction enzyme analysis and pulsed-field gel electrophoresis were applied to 65 isolates of L. monocytogenes, resulting in 16 different clonal types. Two clonal types were shared by the farm tank milk and the dairy silo milk. All except one clonal type belonged to serovar 1/2a. In the dairy silo milk five clonal types were found more frequently and for a longer period than the others. No Listeria species were found in any other samples from the plant.

* Corresponding author. Mailing address: Arla Foods Innovation, S-105 46 Stockholm, Sweden. Phone: 46 8 6773256. Fax: 46 8 203329. E-mail: elisabet.waak{at}arlafoods.com.

Applied and Environmental Microbiology, July 2002, p. 3366-3370, Vol. 68, No. 7
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.7.3366-3370.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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