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  • 1.
    Arneborn, Malin
    et al.
    Smittskyddsinstitutet.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Ökning av antalet listeriosfall2000In: Smittskydd, ISSN 1401-0690, no 12, p. 135-135Article in journal (Refereed)
  • 2.
    Carrique-Mas, J.J.
    et al.
    Department of Epidemiology, Swedish Institiute for Infectious Disease Control, Solna.
    Hökeberg, I.
    Gävleborg County Office for Infectious Disease Control, Landstinget Gävleborg, Gävle; Section of Infectious Diseases, Department of Medical Sciences, Uppsala University Hospital, Uppsala.
    Andersson, Yvonne
    Department of Epidemiology, Swedish Institiute for Infectious Disease Control, Solna.
    Arneborn, Malin
    Department of Epidemiology, Swedish Institiute for Infectious Disease Control, Solna.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, SLU, Uppsala, Sweden.
    Danielsson-Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, SLU, Uppsala, Sweden.
    Osterman, B.
    Department of Clinical Microbiology, Karolinska Institutet, Stockholm.
    Leffler, My
    Section of Veterinary Service and Food Control, Gävleborg Administrative Board, Gävle.
    Steen, M.
    Section of Veterinary Service and Food Control, Gävleborg Administrative Board, Gävle.
    Eriksson, E.
    Department of Bacteriology, National Veterinary Institute, Uppsala.
    Hedin, G.
    Gävleborg County Office for Infectious Disease Control, Landstinget Gävleborg, Gävle; Section of Infectious Diseases, Department of Medical Sciences, Uppsala University Hospital, Uppsala.
    Giesecke, J.
    Department of Epidemiology, Swedish Institiute for Infectious Disease Control, Solna.
    Febrile gastroenteritis after eating on-farm manufactured fresh cheese: an outbreak of listeriosis?2003In: Epidemiology and Infection, ISSN 0950-2688, E-ISSN 1469-4409, Vol. 130, p. 79-86Article in journal (Refereed)
  • 3.
    Danielsson Tham, Marie-Louise
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Jutell, Ingrid
    Department of Food Hygiene, Faculty of Veterinary Medicine, SLU, Uppsala.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Why is listeriosis increasing among humans?1989In: Healthy Animals, Safe Foods, Healthy Man, World association of Veterinary Food Hygienists Xth (Jubilee) International Symposium in Stockholm 2-7 July 1989 / [ed] Länstyrelsen i Stockholms län, Stockholm: Länstyrelsen i Stockholms län , 1989, Vol. 2–7 July, p. 316-319Conference paper (Refereed)
  • 4.
    Danielsson Tham, Marie-Louise
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Loncarevic, Semir
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Serovars and genomic characteristics of Listeria monocytogenes isolated from raw milk cheese1996Conference paper (Other academic)
  • 5.
    Danielsson Tham, Marie-Louise
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Nya metoder vid diagnostik av matförgiftningar1994Report (Other academic)
  • 6.
    Danielsson Tham, Marie-Louise
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Släpp inte pastöriseringskravet!1991In: Svensk veterinärtidning, ISSN 0346-2250, Vol. 43, no 16, p. 735-735Article in journal (Refereed)
  • 7.
    Danielsson Tham, Marie-Louise
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Svärmors ost1989In: Svensk veterinärtidning, ISSN 0346-2250, Vol. 41, no 14, p. 886-887Article in journal (Other (popular science, discussion, etc.))
  • 8.
    Danielsson-Tham, Marie-Louise
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swed. Univ. of Agricultural Sciences, Uppsala, Sweden.
    Andersson, Yvonne
    Smittskyddsinstitutet.
    Arneborn, M.
    Smittskyddsinstitutet.
    Carrique-Mas, J.
    SMI.
    Eriksson, E.
    SVA.
    Hedin, G.
    Smittskyddsenheten, Gävleborg och Inst f Med Vetenskap Uppsala Universitet.
    Hökeberg, I.
    Smittskyddsenheten, Gävleborg och Inst f Med Vetenskap Uppsala Universitet.
    Leffler, My
    Länsstyrelsen i Gävleborg.
    Lüdtke, Lena
    Veterinärhögskolan.
    Osterman, B.
    Avd. Mirkobiol Karolinska Sjukhuset.
    Steen, Margareta
    Länsstyrelsen i Gävleborg.
    Svender, O.
    HC i Ljusdal.
    Svensson, B.
    HC i Ljusdal.
    Sørgjerd, S.
    Veterinärhögskolan.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swed. Univ. of Agricultural Sciences, Uppsala, Sweden.
    Det första kända utbrottet av gastrointestinal listerios i Sverige: Veterinary Public Health-aspekter och laboratorieanalyser2001In: Svenska Läkaresällskapets Riksstämma 28–30 november 2001: program och sammanfattningar, Stockholm: Svenska Läkaresällskapet , 2001, Vol. 110, p. 209-210Conference paper (Other academic)
  • 9.
    Danielsson-Tham, Marie-Louise
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Bannerman, Elisabeth
    Institut Pasteur, Paris, France.
    Bille, Jacques
    Lausanne, Switzerland.
    Ericsson, Henrik
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Jacquet, Christine
    Institut Pasteur, Paris, France.
    Loncarevic, Semir
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Rocourt, Jocelyne
    Institut Pasteur, Paris, France.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Ursing, Jan
    Malmö Allmänna Sjukhus, Malmö, Sweden.
    The characterization of Swedish human Listeria monocygtogenes strains isolated 1958–19941995In: Proceedings of the XII International Symposium on Problems of Listeriosis, Canning Bridge: Promaco Conventions , 1995, p. 469-469Conference paper (Refereed)
  • 10.
    Danielsson-Tham, Marie-Louise
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Bille, Jaques
    Centre National de Référence des Listerias, Centre Hopsitalier Universitaire Vaudois, Lausanne, Switzerland.
    Brosch, Roland
    Laboratoire des Listeria, Institute Pasteur, Paris, France.
    Buchrieser, Carmen
    Laboratoire des Listeria, Institute Pasteur, Paris, France.
    Persson, K.
    Department of Bacteriology, University of Lund, General Hospital, Malmö, Sweden.
    Rocourt, Jocelyne
    Laboratoire des Listeria, Institute Pasteur, Paris, France.
    Schwarzkopf, A.
    Institute für Hygiene und Mikrobiologie, Würzburg, Germany.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Ursing, Jan
    Department of Bacteriology, University of Lund, General Hospital, Malmö, Sweden.
    Characterization of Listeria strains isolated from soft cheese1993In: International Journal of Food Microbiology, ISSN 0168-1605, E-ISSN 1879-3460, Vol. 18, no 2, p. 161-166Article in journal (Refereed)
    Abstract [en]

    Three soft cheeses were exposed to quantitative analysis for listeria and found to contain a large number of listeria. Thirty-five of the listeria strains isolated from the three cheeses were characterized by use of biochemical tests, serotyping, phagetyping and DNA restriction enzyme analysis. Seven isolates were identified as Listeria innocuaand 28 as Listeria monocytogenes. Two to four different clones of L. monocytogenescould be identified from each cheese. In contrast, only one clone could be detected among the L. innocua isolates. From an epidemiological point of view the findings of different clones of L. monocytogenes in the same cheese emphasize the need for typing several listeria isolates from one and the same food sample. It is concluded that the best overview of the population of the listeria strains is obtained after direct plating of the sample followed by enumeration, isolation and extensive typing.

  • 11.
    Danielsson-Tham, Marie-Louise
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Bille, Jaques
    Centre National de Référence des Listerias, Centre Hopsitalier Universitaire Vaudois, Lausanne, Switzerland.
    Brosch, Roland
    Laboratoire des Listeria, Institute Pasteur, Paris, France.
    Buchrieser, Carmen
    Laboratoire des Listeria, Institute Pasteur, Paris, France.
    Persson, K.
    Department of Bacteriology, University of Lund, General Hospital, Malmö, Sweden.
    Rocourt, Jocelyne
    Laboratoire des Listeria, Institute Pasteur, Paris, France.
    Schwarzkopf, A.
    Institute für Hygiene und Mikrobiologie, Würzburg, Germany.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Ursing, Jan
    Department of Bacteriology, University of Lund, General Hospital, Malmö, Sweden.
    Characterization of Listeria strains isoplated from soft cheese1992In: Listeria 1992The Eleventh International Symposium on Problems of ListeriosisISOPOL XIEigtved’s Pakhus – Copenhagen11–14 May 1992 / [ed] Peter Gerner-Smidt, ISOPOL, 1992, p. 121-122Conference paper (Refereed)
  • 12.
    Danielsson-Tham, Marie-Louise
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, SLU, Uppsala.
    Eriksson, E.
    Department of Bacteriology, National Veterinary Institute, Uppsala.
    Helmersson, Seved
    Department of Food Hygiene, Faculty of Veterinary Medicine, SLU, Uppsala.
    Leffler, My
    Section of Veterinary Service and Food Control, County Administrative Board of Gävleborg, Gävle, .
    Lüdtke, Lena
    Department of Food Hygiene, Faculty of Veterinary Medicine, SLU, Uppsala.
    Steen, Margareta
    Section of Veterinary Service and Food Control, County Administrative Board of Gävleborg, Gävle, Sweden.
    Sørgjerd, Sölvi
    Department of Food Hygiene, Faculty of Veterinary Medicine, SLU, Uppsala.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, SLU, Uppsala.
    Causes behind a human cheese-borne outbreak of gastrointestinal listeriosis2004In: Foodborne pathogens and disease, ISSN 1535-3141, E-ISSN 1556-7125, Vol. 1, no 3, p. 153-159Article in journal (Refereed)
    Abstract [en]

    In a previous paper, we reported an outbreak of gastrointestinal listeriosis due to consumption of fresh cheese made from raw milk and manufactured on a summer farm. The aim of the present study was to investigate why the cheese harbored Listeria monocytogenes. To our knowledge, this is the first documented outbreak of listeriosis caused by raw milk cheese where the human epidemic strain has been cultured from a dairy animal, whose milk has been used for cheese production. The conditions on a summer farm can hardly fulfil the requirements for hygienic and strictly controlled conditions necessary for safe processing of fresh cheese.

  • 13.
    Danielsson-Tham, Marie-Louise
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Prag, Mårten
    Dep of Infectious Diseases, Örebro County Hospital, Örebvro, Sweden.
    Rocourt, Jocelyne
    Institut Pasteur, Paris, France.
    Seeliger, Heinz
    Institut für Hygiene und Mikrobiologie der Universität Würzburg, Würzburg, Germany.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Vikerfors, T.
    Dep of Infectious Diseases, Örebro County Hospital, Örebvro, Sweden.
    A fatal case of Listeria endocarditis in a man following his tending of goats suggests an epidemiological link which is not supported by the results1997In: Journal of Veterinary Medicine Series B-Infectious Diseases and Veterinary Public Health, ISSN 0931-1793, E-ISSN 1439-0450, Vol. B 44, no 1-10, p. 253-256Article in journal (Refereed)
    Abstract [en]

    A man died in endocarditis due to listeriosis in the late autumn. He had been looking after two goats during the summer. Listeria monocyto?enes was isolated from a rectal swab from one of the goats. The goat faeces isolate and the human blood isolate were of identical serovar. The two isolates, however, were shown to be different by multilocus electrophoretic enzyme analysis and ribotyping, as well as by biotyping, Thus, these results do not support the hypothesis that the man was infected by the goat.

  • 14.
    Danielsson-Tham, Marie-Louise
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    A case of food-borne listerios in Sweden and the significance of correct analyses of the food1995In: 9th World Congress of Food Science and Technology: abstracts of lectures and posters. Vol. II, Budapest, Hungary: The Hungarian Scientific Society for Food Industry , 1995, p. 159-159Conference paper (Refereed)
  • 15.
    Danielsson-Tham, Marie-Louise
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Tham, WilhelmDepartment of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Concluding remarks and general discussion: Food Associated Pathogens, May 6-8, 1996, Uppsala, Sweden1997Conference proceedings (editor) (Other academic)
  • 16.
    Danielsson-Tham, Marie-Louise
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Förståelse av listerios med hjälp av molekylärbiologiska tekniker1999Conference paper (Refereed)
  • 17.
    Danielsson-Tham, Marie-Louise
    et al.
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Tham, Wilhelm
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Is food hygiene a part of culinary arts and meal science?2016In: 1st Granqvist Culinary Arts and Meal Science Symposium: Programme and Abstracts / [ed] Tobias Nygren, Agneta Yngve och Åsa Öström, Örebro: Örebro University , 2016, Vol. 1, p. 28-28Conference paper (Refereed)
  • 18.
    Danielsson-Tham, Marie-Louise
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Listeria – insigths and reflections2004In: ISOPOL XV – XV International Symposium on Problems of ListeriosisUppsala, Sweden, September 12–15, 2004 / [ed] Marie-Louise Danielsson-Tham, Wilhelm Tham och Henrik Ericsson, Uppsala: Dep of Food Hygiene, Faculty of Veterinary Medicine and Animal Sciences, SLU , 2004, p. Abstract Nr. 151-Conference paper (Refereed)
  • 19.
    Danielsson-Tham, Marie-Louise
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Med pedagogiska ögon i Aguélis fotspår1998In: Aguélimuseets Vänner, ISSN 0284-9402, Vol. 11, p. 14-18Article in journal (Other (popular science, discussion, etc.))
  • 20.
    Danielsson-Tham, Marie-Louise
    et al.
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Tham, WilhelmÖrebro University, School of Hospitality, Culinary Arts & Meal Science.
    Nordic PFGE meeting January 27–28, 2000, Uppsala, Sweden2000Conference proceedings (editor) (Refereed)
  • 21.
    Danielsson-Tham, Marie-Louise
    et al.
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Tham, WilhelmÖrebro University, School of Hospitality, Culinary Arts & Meal Science.
    Proceedings and Programme: Food Associated Pathogens, May 6-8, 1996, Uppsala, Sweden1996Conference proceedings (editor) (Refereed)
  • 22.
    Danielsson-Tham, Marie-Louise
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Tham, WilhelmDepartment of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Proceedings of the symposium Food Associated Pathogens, May 6-8, 1996, Uppsala, Sweden1996Conference proceedings (editor) (Refereed)
  • 23.
    Danielsson-Tham, Marie-Louise
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Programme Opening Ceremony: Food Associated Pathogens1996In: Proceedings of the symposium Food Associated Pathogens, May 6-8, 1996, Uppsala, Sweden / [ed] Wilhelm Tham & Marie-Louise Danielsson-Tham, Uppsala: SLU, Department of Food Hygiene , 1996Conference paper (Refereed)
  • 24.
    Danielsson-Tham, Marie-Louise
    et al.
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Tham, WilhelmÖrebro University, School of Hospitality, Culinary Arts & Meal Science.
    Second Symposium on Food Associated Pathogens2010Conference proceedings (editor) (Other academic)
  • 25.
    Danielsson-Tham, Marie-Louise
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Tham, WilhelmDepartment of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.Ericsson, HenrikDepartment of Food Hygiene, Faculty of Veterinary Medicine, SLU, Upsala, Sweden.
    ISOPOL XV – XV International Symposium on Problems of Listeriosis, Uppsala, Sweden, September 2004: ABSTRACTS2004Conference proceedings (editor) (Refereed)
  • 26.
    Eilertz, Ingrid
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, University of Agricultural Sciences, Uppsala, Sweden.
    Danielsson Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, University of Agricultural Sciences, Uppsala, Sweden.
    Hammarberg, Karl-Erik
    Department of Food Hygiene, Faculty of Veterinary Medicine, University of Agricultural Sciences, Uppsala, Sweden.
    Reeves, MW
    Rocourt, Jocelyne
    Laboratoire des Listeria, Institute Pasteur, Paris, France.
    Seeliger, HPR
    Institute für Hygiene und Mikrobiologie, Würzburg, Germany.
    Swaminathan, Balasubramanian
    Centers for Disease Control and Prevention, Atlanta GA, USA.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, University of Agricultural Sciences, Uppsala, Sweden.
    Isolation of Listeria monocytogenes from goat cheese associated with a case of listeriosis in goat1993In: Acta Veterinaria Scandinavica, ISSN 1751-0147, E-ISSN 1751-0147, Vol. 34, no 2, p. 145-149Article in journal (Refereed)
    Abstract [en]

    Listeria monocytogenes was isolated from the brain of a goat, which was euthanized due to listeriosis. A few weeks later a similar subtype of L. monocytogenes was isolated from an on-farm manufactured fresh cheese which did not contain any milk from the goat which had suffered from listeriosis. A similar subtype was also found on 1 of the shelves in the refrigerator where cheeses were stored. Prior to the onset of listeriosis, 1 fresh cheese had been made of milk from the actual goat, which may have excreted L. monocytogenes in her milk. Thus, the cheese made of this milk may have contaminated the shelves in the refrigerator which then has served as a Listeria reservoir for new cheeses during several weeks.

  • 27.
    Eklöw, A.
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Danielsson-Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Ericsson, Henrik
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Loncarevic, Semir
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Mentzing, L.-O.
    Communicable Disease Center for Värmland, Karlstad Central Hospital, Karlstad, Sweden.
    Persson, I
    Communicable Disease Center for Värmland, Karlstad Central Hospital, Karlstad, Sweden.
    Unnerstad, Helle
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Listeriosis in the province of Värmland: The first reported outbreak of food-borne listeriosis in Sweden1996In: Proceedings of the symposium Food Associated Pathogens, May 6-8, 1996, Uppsala, Sweden / [ed] Wilhelm Tham & Marie-Louise Danielsson-Tham, Uppsala: SLU, Department of Food Hygiene , 1996, p. 222-223Conference paper (Refereed)
  • 28. Eklöw, Annelie
    et al.
    Danielsson-Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Bannerman, Elisabeth
    Bille, Jacquet
    Ericsson, Henrik
    Jacquet, Christine
    Loncarevic, Semir
    Rocourt, Jocelyne
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Ursing, Jan
    Three important clones of Listeria monocytogenes1996In: Proceedings of the symposium Food Associated Pathogens, May 6-8, 1996, Uppsala, Sweden / [ed] Wilhelm Tham & Marie-Louise Danielsson-Tham, Uppsala: SLU, Department of Food Hygiene , 1996, p. 221-222Conference paper (Refereed)
    Abstract [en]

    The object of this study was to characterize Swedish human strains of Listeria monocytogenes

  • 29.
    Eklöw, Annelie
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Danielsson-Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Ericsson, Henrik
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Loncarevic, Semir
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Unnerstad, Helle
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Värmlandsutbrottet – det första listeriosutbrottet i Sverige där smittkällan identifierats1995In: Poster-sammanfattningar – Livsmedel 95, Uppsala, Uppsala, 1995, p. MM13-MM13Conference paper (Refereed)
  • 30.
    Eld, Karin
    et al.
    Bacteriological Laboratory, National Veterinary Institute, Uppsala, Sweden.
    Danielsson Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Gunnarsson, Anders
    Bacteriological Laboratory, National Veterinary Institute, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Comparison of a cold enrichment method and the IDF method for isolation of Listeria monocytogenes from animal autopsy material1992In: Listeria 1992: The Eleventh International Symposium on Problems of Listeriosis: book of abstracts, København: Statens Seruminstitut , 1992, p. 158-159Conference paper (Refereed)
  • 31.
    Eld, Karin
    et al.
    Bacteriological Laboratory, National Veterinary Institute, Uppsala, Sweden.
    Danielsson Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Gunnarsson, Anders
    Bacteriological Laboratory, National Veterinary Institute, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Comparison of a cold enrichment method and the IDF method for isolation of Listeria monocytogenes from autopsy material1993In: Veterinary Microbiology, ISSN 0378-1135, E-ISSN 1873-2542, Vol. 36, no 1-2, p. 185-189Article in journal (Refereed)
    Abstract [en]

    The method most often used in Sweden for isolation of Listeria monocytogenes from animal autopsy material is a cold enrichment method. This method is very slow. The International Dairy Federation (IDF) has recently presented a method for detection of L. monocytogenes in milk and milk products that is complete in one week. During a two year period 69 specimens from dead animals with suspected listeriosis were examined for L. monocytogenes in parallel analyses with both the cold enrichment method and the IDF method. Samples derived from different autopsy material representing a variety of animals. L. monocytogenes was isolated in 27.5% of the samples with the IDF method but only in 4.3% with the cold enrichment method. It is concluded that the IDF method was more sensitive than the cold enrichment method.

  • 32.
    Englund, Lena
    et al.
    National Veterinary Institute, Uppsala, Sweden.
    Bille, Jaques
    Centre National de Référence des Listerias, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland.
    Danielsson Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden..
    Eld, Karin
    National Veterinary Institute, Uppsala, Sweden.
    Gavier-Widén, D.
    National Veterinary Institute, Uppsala, Sweden.
    Rocourt, Jocelyne
    Institut Pasteur, Paris, France.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden..
    A possible outbreak of listeriosis in a farmed herd of fallow deer (Dama dama)1992In: Listeria 1992: The Eleventh International Symposium on Problems of Listeriosis (ISOPOL XI) / [ed] Peter Gerner-Smidt, ISOPOL, Copenhagen, Denmark: SSI , 1992, p. 43-44Conference paper (Refereed)
  • 33.
    Ericsson, H.
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Stålhandske, P.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Danielsson-Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Bannerman, E.
    Centre National des Listeria, Institut de Microbiologie, Lausanne, Switzerland.
    Bille, J.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden; Centre National des Listeria, Institut de Microbiologie, Lausanne, Switzerland.
    Jacquet, Ch.
    Centre National des Listeria, Institut de Microbiologie, Lausanne, Switzerland.
    Rocourt, J.
    Laboratoire des Listeria, Institut Pasteur, Paris, France.
    Ursing, J.
    Laboratoire des Listeria, Institut Pasteur, Paris, France.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Division into five groups by REA of the most frequently isolated phagovar of Listeria monocytogenes in Sweden 1976–19851996In: Medical Microbiology Letters, ISSN 1018-4627, Vol. 5, no 3, p. 145-155Article in journal (Refereed)
    Abstract [en]

    One hundred and seven strains of Listeria monocytogenes isolated from human cases of listeriosis in Sweden during 1976-1985 were investigated. Sero- and phagetyping showed that 74 strains (69%) belonged to serovar 4b and that 47 of these strains also shared phagovar 2389:2425:3274:2671:47:108:340. Strains sharing this phagovar were further analyzed by REA, and could accordingly be arranged into five REA groups. However, the majority of the 47 strains were distributed in two of the groups. This indicates that two clones of L. monocytogenes were responsible for a major part of the human cases of listeriosis in Sweden during the ten-year period studied.

  • 34.
    Ericsson, Henrik
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Danielsson Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Stålhandske, Per
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Subtypning av en i Sverige vanlig fagovar av Listeria monocytogenes1992In: Svenska Läkaresällskapets Riksstämma 25–27 november 1992: Program & sammanfattningar / [ed] Lars Åke Pellborn, Stockholm: Svenska läkaresällskapet , 1992, p. 250-250Conference paper (Other academic)
  • 35.
    Ericsson, Henrik
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Danielsson Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Stålhandske, Per
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Jan, Ursing
    Department of Bacteriology, University of Lund, General Hospital, Malmö, Sweden.
    Subtyping of a frequent phagovar of Listeria monocytogenes in Sweden by use of restriction endonuclease analysis1993In: APMIS: Acta pathologica, microbiologica et immunologica Scandinavica. Supplementum, ISSN 0903-465X, E-ISSN 1600-5503, Vol. 101, no 7-12, p. 971-974Article in journal (Refereed)
    Abstract [en]

    In Sweden, many Listeria monocytogenes strains belonging to serovar 4b and isolated during the last five years from different sources share the same phagovar - 2389:2425:3274:2671:47:108:340. The object of the present study was to investigate if 31 L. monocytogenes serovar 4b strains belonging to this particular phagovar could be differentiated by use of a simple restriction endonuclease analysis (REA). Among the enzymes tested, Xho I was found to be the most useful, since this enzyme could divide the 31 strains into five groups. The profiles of all human clinical isolates were indistinguishable from each other, which indicates that these strains may represent a single clone. The food isolates and the strains of human origin did not share the same profile. This further characterization may be of epidemiological importance as this phagovar of L. monocytogenes has been associated with at least two outbreaks of human listeriosis in Europe.

  • 36.
    Ericsson, Henrik
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Danielsson-Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Listeria monocytogenes serovar 4b strains divided into two groups using polymerase chain reaction (PCR) and restriction enzyme analysis (REA)1995In: Proceedings of the XII Interenational Symposium on Problems of Listeriosis, Canning Bridge: Promaco Conventions , 1995, p. 421-421Conference paper (Refereed)
  • 37.
    Ericsson, Henrik
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Eklöw, Annelie
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Danielsson-Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Loncarevic, Semir
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Mentzing, L.-O.
    Communicable Disease Center for Värmland County, Karlstad Central Hospital, Karlstad, Sweden.
    Persson, I.
    Communicable Disease Center for Värmland County, Karlstad Central Hospital, Karlstad, Sweden.
    Unnerstad, Helle
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    An outbreak of listeriosis suspected to have been caused by rainbow trout1997In: Journal of Clinical Microbiology, ISSN 0095-1137, E-ISSN 1098-660X, Vol. 35, no 11, p. 2904-2907Article in journal (Refereed)
    Abstract [en]

    An outbreak of listeriosis in Sweden, consisting of nine cases, was investigated by means of molecular typing of strains from patients and strains isolated from suspected foodstuffs, together with interviews of the patients. Listeria monocytogenes was isolated from six of the patients, and all isolates were of the same clonal type. This clonal type was also isolated from a 'gravad' rainbow trout, made by producer Y, found in the refrigerator of one of the patients. Unopened packages obtained from producer y were also found to contain the same clonal type of L. monocytogenes. Based on the interview results and the bacteriological typing, we suspect that at least six of the nine cases were caused by gravad or cold-smoked rainbow trout made by producer Y. To our knowledge, this is the first rainbow trout-borne outbreak of listeriosis ever reported.

  • 38.
    Ericsson, Henrik
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Loncarevic, Semir
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Unnerstad, Helle
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Listeriosproblematiken belyst från andra sidan jordklotet1996In: Svensk veterinärtidning, ISSN 0346-2250, Vol. 48, p. 126-129Article in journal (Refereed)
  • 39.
    Ericsson, Henrik
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Stålhandske, Per
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Danielsson-Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Bannerman, Elisabeth
    Medical Bacteriology Laboratory, University Hospital, Lausanne, Switzerland.
    Bille, Jacques
    Medical Bacteriology Laboratory, University Hospital, Lausanne, Switzerland.
    Jacquet, Christine
    Centre National de Référence des Listeria, World Health Organization Collaborating Center for Foodborne Listeriosis, Institut Pasteur, Paris, France.
    Rocourt, Jocelyne
    Centre National de Référence des Listeria, World Health Organization Collaborating Center for Foodborne Listeriosis, Institut Pasteur, Paris, France.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Division of Listeria monocytogenes serovar 4b strains into two groups by PCR and restriction enzyme analysis1995In: Applied and Environmental Microbiology, ISSN 0099-2240, E-ISSN 1098-5336, Vol. 61, no 11, p. 3872-3874Article in journal (Refereed)
    Abstract [en]

    Altogether, 133 strains of Listeria monocytogenes serovar 4b were investigated, A segment of 2,916 bp containing parts of the two genes inlA and inlB in L. monocytogenes was amplified by the PCR technique. The PCR product obtained was cleaved with the restriction enzyme AluI, and the fragments generated were separated by gel electrophoresis, leading to two distinct groups: PCR-restriction enzyme analysis groups I and II, containing 37 and 96 strains, respectively, The PCR-restriction enzyme analysis method described in this paper could be a useful tool for the subtyping of L. monocytogenes serovar 4b strains.

  • 40.
    Ericsson, Henrik
    et al.
    Inst för livsmedelshygien, Veterinärhögskolan, Stockholm, Sverige.
    Unnerstad, Helle
    Avd för mastit och substratproduktion, SVA, Uppsala, Sverige.
    Alderborn, Anders
    Pyrosequencing AB, Uppsala, Sverige.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Danielsson-Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Mattsson, Jens G.
    Avd för parasitologi, SVA, Uppsala, Sverige.
    Pyrosekvensering som typningsmetod för Listeria monocytpgenes2003In: Svensk veterinärtidning, ISSN 0346-2250, Vol. 55, no 4, p. 23-26Article in journal (Refereed)
  • 41.
    Ericsson, Henrik
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Unnerstad, Helle
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Mattsson, Jens G.
    Department of Parasitology, National Veterinary Institute, Uppsala, Sweden.
    Danielsson-Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Molecular grouping of Listeria monocytogenes based on the sequence of the inlB gene2000In: Journal of Medical Microbiology, ISSN 0022-2615, E-ISSN 1473-5644, ISSN 0022-2615, Vol. 49, no 1, p. 73-80Article in journal (Refereed)
    Abstract [en]

    The major part of the gene inlB was sequenced in 24 strains of Listeria monocytogenes belonging to serovars 1/2a, 1/2b, 1/2c, 3b and 4b. A phylogenetic analysis based on the inlB nucleotide sequences showed that strains of serovars 1/2a and 1/2c were closely related, as well as those of serovars 1/2b and 3b. Strains sharing serovar 4b could be divided into two distinct groups. There were differences in amino-acid sequence between all serovars except between serovars 1/2b and 3b. Differences in amino-acid sequence were also seen within each of the serovars 1/2a and 4b. The data presented indicate that the inlB gene may be useful for typing purposes as an alternative or complement to serotyping.

  • 42.
    Ericsson, Henrik
    et al.
    Department of Food Hygiene, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Unnerstad, Helle
    Department of Food Hygiene, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Danielsson-Tham, Marie-Louise
    Department of Food Hygiene, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Ett nytt sätt att typa Listeria monocytogenes1999In: Svensk veterinärtidning, ISSN 0346-2250, Vol. 51, no 8–9, p. 429-431Article in journal (Refereed)
  • 43.
    Hökeberg, I.
    et al.
    Smittskyddsenheten, Gävleborg; Inst. för Medicinsk Vetenskap, Uppsala Universitet, Uppsala.
    Andersson, Yvonne
    Smittskyddsinstitutet, Solna.
    Arneborn, Malin
    Smittskyddsinstitutet, Solna.
    Carrique-Mas, J.
    Smittskyddsinstitutet, Solna.
    Danielsson-Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Eriksson, E.
    Statens Veterinärmedicinska Anstalt, Uppsala.
    Hedin, G.
    Smittskyddsenheten, Gävleborg; Inst. för Medicinsk Vetenskap, Uppsala Universitet, Uppsala.
    Leffler, My
    Länsstyrelsen, Gävleborg.
    Lüdtke, Lena
    Inst för livsmedelshygien, Veterinärhögskolan, SLU, Uppsala.
    Osterman, Björn
    Avd. för Mirkobiol. Karolinska Sjukhuset, Stockholm.
    Steen, Margareta
    Länsstyrelsen, Gävleborg.
    Svender, O.
    HC i Ljusdal resp. Järvsö.
    Svensson, B.
    HC i Ljusdal resp. Järvsö.
    Sörgjerd, S
    Inst. för livsmedelshygien, Veterinärhögskolan, SLU, Uppsala.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Det första kända utbrottet av gastrointestinal listerios i Sverige. Epidemiologi och klinik2001In: Svenska Läkaresällskapets Riksstämma. 28–30 november 2001: Program och sammanfattningar / [ed] Svenska Läkaresällskapet, Stockholm: Svenska Läkarsällskapet , 2001, Vol. 110, häfte 2, p. 209-210Conference paper (Refereed)
  • 44.
    Ingermaa, Fredrika
    et al.
    Dep of Food Hygiene, Faculty of Veterinary Medicine.
    Parihar, Vishal
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Danielsson-Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Båverud, Viveca
    Department of Bacteriology, National Veterinary Institute.
    Helmersson, Seved
    Department of Food Hygiene, Faculty of Veterinary Medicine.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Sheep, humans and listeriosis2004In: ISOPOL XV. XV International Symposium on Problems of Listeriosis. Uppsala, Sweden, September 12–15, 2004 / [ed] Danielsson-Tham M-L, Than W och Ericsson Henrik, Uppsala: Dep of Food Hygiene, Faculty of Veterinary Medicine , 2004, p. Abstract no. 129-Conference paper (Refereed)
  • 45. Lindstedt, Bjørn-Arne
    et al.
    Tham, Wilhelm
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Danielsson-Tham, Marie-Louise
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Vardund, Traute
    Helmersson, Seved
    Kapperud, Georg
    Multiple-locus variable-number tandem-repeats analysis of Listeria monocytogenes using multicolour capillary electrophoresis and comparison with pulsed-field gel electrophoresis typing2008In: Journal of Microbiological Methods, ISSN 0167-7012, E-ISSN 1872-8359, Vol. 72, no 2, p. 141-148Article in journal (Refereed)
    Abstract [en]

    The multiple-locus variable-number tandem-repeats analysis (MLVA) method for genotyping has proven to be a fast and reliable typing tool in several bacterial species. MLVA is in our laboratory the routine typing method for Salmonella enterica subsp. enterica serovar Typhimurium and Escherichia coli O157. The gram-positive bacteria Listeria monocytogenes, while not isolated as frequent as S. Typhimurium and E. coli, causes severe illness with an overall mortality rate of 30%. Thus, it is important that any outbreak of this pathogen is detected early and a fast trace to the source can be performed. In view of this, we have used the information provided by two fully sequenced L. monocytogenes strains to develop a MLVA assay coupled with high-resolution capillary electrophoresis and compared it to pulsed-field gel electrophoresis (PFGE) in two sets of isolates, one Norwegian (79 isolates) and one Swedish (61 isolates) set. The MLVA assay could resolve all of the L. monocytogenes serotypes tested, and was slightly more discriminatory than PFGE for the Norwegian isolates (28 MLVA profiles and 24 PFGE profiles) and opposite for the Swedish isolates (42 MLVA profiles and 43 PFGE profiles).

  • 46.
    Loncarevic, Semir
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Bannerman, Elisabeth
    Centre National des Listeria, Institut de Microbiologi, Lausanne, Switzerland.
    Bille, Jacques
    Centre National des Listeria, Institut de Microbiologi, Lausanne, Switzerland.
    Danielsson-Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Characterization of Listeria strains isolated from soft and semi-soft cheeses1998In: Food microbiology (Print), ISSN 0740-0020, E-ISSN 1095-9998, Vol. 15, no 5, p. 521-525Article in journal (Refereed)
    Abstract [en]

    Two hundred strains ofListeria monoctyogenespreviously isolated from 19 soft and semi-soft cheeses by enrichment were characterized by serotyping and pulsed-field gel electrophoresis (PFGE). Strains of serogroup 1/2 predominated, with 33.5% of all strains belonging to serovar 1/2a, 58.5% to serovar 1/2b and 5% to serovar 1/2c. By using a PFGE method, 16 different clonal types were obtained. All 10 isolates ofL. monocytogenesrecovered from one white mould cheese were serovar 1/2a, but displayed two different PFGE profiles. Another 10L. monocytogenesisolates from white mould cheese recovered after a 48-h enrichment broth procedure revealed two clonal types, only one of which could be detected after 5 additional days of incubation in the same enrichment broth. Cross-contamination in dairy plants and/or retail stores may play an important role in the incidence and diversity ofL. monocytogenesclonal types recovered from soft and semi-soft cheeses. Therefore, it is necessary to characterize several isolates from the same sample when conducting epidemiological investigations.

    Copyright © 1998 Academic Press. All rights reserved.

  • 47.
    Loncarevic, Semir
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine SLU, Uppsala, Sweden.
    Danielsson-Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine SLU, Uppsala, Sweden.
    Gerner-Smidt, Peter
    National Serum Institute, Department of Gastrointestinal Infections, Copenhagen, Denmark.
    Sahlström, Lena
    Department of Food Hygiene, Faculty of Veterinary Medicine SLU, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine SLU, Uppsala, Sweden.
    Potential sources of human listeriosis in Sweden1998In: Food microbiology (Print), ISSN 0740-0020, E-ISSN 1095-9998, Vol. 15, no 1, p. 65-69Article in journal (Refereed)
  • 48.
    Loncarevic, Semir
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Danielsson-Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Mårtensson, Lennart
    Swedish Laboratory Service, Kalmar, Sweden.
    Ringnér, Åke
    Communicable Diseases Control Unit, Kalmar County Council, Kalmar, Sweden.
    Runehagen, Arne
    Communicable Diseases Control Unit, Kronoberg County Council, Växjö, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    A case of foodborne listeriosis in Sweden1997In: Letters in Applied Microbiology, ISSN 0266-8254, E-ISSN 1472-765X, Vol. 24, no 1, p. 65-68Article in journal (Refereed)
    Abstract [en]

    A 70-year-old woman fell seriously ill overnight with meningitis and was admitted to hospital. Cerebrospinal fluid culture yielded Listeria monocytogenes. One of the first problems in solving a human case of listeriosis suspected to be foodborne is to find the foods likely to have been transmitting L. monocytogenes. Two enrichment procedures and a direct plating procedure were used for isolation of the bacteria from different food items collected from the patient's refrigerator, local retail store and producer. Samples of vacuum-packed products of sliced pork brawn, sliced cooked medwurst and berliner wurst of the same brand harboured L. monocytogenes. Serotyping and restriction enzyme analysis (REA) with pulsed-field gel electrophoresis (PFGE) were used to characterize and compare 41 isolates, including the human strain. At least three clones were present in the foods investigated, and one of these was identical to the human clone. This clone was present in samples of medwurst from the patient's refrigerator and the local retail store. This is, to our knowledge, the first proven foodborne case of listeriosis reported in Sweden.

  • 49.
    Loncarevic, Semir
    et al.
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Danielsson-Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
    Occurrence of Listeria monocytogenes in soft and semi-soft cheeses in retail outlets in Sweden1995In: International Journal of Food Microbiology, ISSN 0168-1605, E-ISSN 1879-3460, Vol. 26, no 2, p. 245-250Article in journal (Refereed)
    Abstract [en]

    Samples of 333 retail cheeses produced in or imported into Sweden were examined for the presence of Listeria monocytogenes. Listeria monocytogenes was isolated from 6% of the cheese samples. Cheeses made from raw milk were more frequently contaminated with L. monocytogenes (42%) than cheeses made from heat-treated milk (2%). The incidence of the organism in whole cheeses and pre-cut wedges was similar (6%). L. monocytogenes was only found in imported cheeses (18 from France, and one from Germany and Italy, respectively). The numbers of L. monocytogenes varied from < 1 x 10(2) to 1 X 10(5) cfu/g. All L. monocytogenes strains belonged to serogroup 1/2, except isolates from two samples that belonged to serogroup 4.

  • 50. Loncarevic, Semir
    et al.
    Danielsson-Tham, Marie-Louise
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Tham, Wilhelm
    Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Serovars and genomic characteristics of cheese isolates of Listeria monocytogenes1996In: Proceedings of the symposium Food Associated Pathogens, May 6-8, 1996, Uppsala, Sweden / [ed] Wilhelm Tham & Marie-Louise Danielsson-Tham, Uppsala: SLU, Department of Food Hygiene , 1996, p. 241-242Conference paper (Refereed)
123 1 - 50 of 148
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