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  • 1.
    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)
  • 2.
    Lopez-Valladares, Gloria
    et al.
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Tham, Wilhelm
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Parihar, Vishal Singh
    Örebro University, School of Health and Medical Sciences, Örebro University, Sweden. Department of Restaurant and Culinary Arts, Örebro University, Grythyttan, Sweden.
    Helmersson, Seved
    Department of Environmental Assessment, SLU, Uppsala, Sweden.
    Andersson, Birgitta
    Department of Bacteriology, Malmö University Hospital, Malmö, Sweden.
    Ivarsson, Sofie
    The Swedish Institute for Infectious Disease Control and MTC, Karolinska Institutet, Solna, Sweden.
    Johansson, Christina
    The Swedish Institute for Infectious Disease Control and MTC, Karolinska Institutet, Solna, Sweden.
    Ringberg, Håkan
    Regional Centre for Communicable Disease Control and Prevention, Malmö, Sweden.
    Tjernberg, Ingela
    Department of Bacteriology, Malmö University Hospital, Malmö, Sweden.
    Henriques-Normark, Birgitta
    The Swedish Institute for Infectious Disease Control and MTC, Karolinska Institutet, Solna, Sweden.
    Danielsson-Tham, Marie-Louise
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Human isolates of Listeria monocytogenes in Sweden during half a century (1958-2010)2014In: Epidemiology and Infection, ISSN 0950-2688, E-ISSN 1469-4409, Vol. 142, p. 2251-2260Article in journal (Refereed)
    Abstract [en]

    Isolates of Listeria monocytogenes (n=932) isolated in Sweden during 1958–2010 from human patients with invasive listeriosis were characterized by serotyping and pulsed-field gel electrophoresis (PFGE) (AscI). Of the 932 isolates, 183 different PFGE types were identified, of which 83 were each represented by only one isolate. In all, 483 serovar 1/2a isolates were distributed over 114 PFGE types; 90 serovar 1/2b isolates gave 32 PFGE types; 21 serovar 1/2c isolates gave nine PFGE types; three serovar 3b isolates gave one PFGE type; and, 335 serovar 4b isolates gave 31 PFGE types. During the 1980s in Sweden, several serovar 4b cases were associated with the consumption of European raw soft cheese. However, as cheese-production hygiene has improved, the number of 4b cases has decreased. Since 1996, serovar 1/2a has been the dominant L. monocytogenes serovar in human listeriosis in Sweden. Therefore, based on current serovars and PFGE types, an association between human cases of listeriosis and the consumption of vacuum-packed gravad and cold-smoked salmon is suggested.

  • 3.
    Parihar, Vishal
    et al.
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    ingermaa, Fredrika
    Dep of Food Hygiene, Faculty of Veterinary Medicine.
    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.
    Zoonotic aspects of Listeria monocytogenes2004In: 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, 2004, p. Abstract no. 128-Conference paper (Refereed)
  • 4.
    Parihar, Vishal Singh
    Örebro University, School of Health and Medical Sciences. Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Human listeriosis: sources and routes2008Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The bacterium Listeria monocytogenes can cause the disease listeriosis in both humans and animals. For the epidemiological investigation of listeriosis detection and characterisation of the organism are important steps.

    Paper I. There are few reports on the incidence of L. monocytogenes in clinical samples from humans in India. Therefore, we investigated 144 samples from immunocompromised patients. L. monocytogenes was isolated from two placental bits from women with poor obstetric history, one patient with renal failure and three other patients. Five isolates were positive for the virulence genes hlyA, actA and iap. The sixth isolate was positive for hlyA and actA genes.

    Paper II. Characterisation of 601 human L. monocytogenes isolates causing invasive listeriosis during the period 1986 to 2007 in Sweden reveals a decrease in serovar 4b strains. Since 1996, serovar 1/2a has become the predominant serovar causing human listeriosis: PFGE analysis revealed two clusters including different serotypes suggesting that we need more studies on genetic relatedness among clinical isolates.

    Paper III. The incidence of Listeria species in seafood from markets in Goa was studied. One hundred and fifteen raw/fresh seafoods bought at the fish markets were sampled and tested for presence of Listeria spp. L. monocytogenes was detected in 10 samples. L. monocytogenes in raw seafood may pose a health risk in kitchen if contaminating ready-to-eat food.

    Paper IV. Gravad and cold-smoked salmon are associated with human listeriosis in Sweden. L. monocytogenes was isolated from 11 of 56 products. Serovar 1/2a was predominant, followed by 4b. REA/PFGE typing of the isolates identified five types of L. monocytogenes. One type was identical to a human type, two other were closely related.These findings suggest that gravad and cold-smoked salmon are still possible sources of listeriosis in Sweden.

    Paper V. Many outbreaks of listeriosis have been related to consumption of dairy-associated products. Therefore, 123 farm bulk milk samples in India and 20 cervico-vaginal samples from dairy cows with reproductive disorders were investigated for L. monocytogenes.

    L. monocytogenes was isolated from 17.9% of bulk milk samples and from 10% of cervico-vaginal swabs. The virulence gene hlyA was detected in all isolates. These findings represent a public health risk where unpasteurised milk and milk products are largely consumed.

    Paper VI. Isolates of L. monocytogenes (n=177) from 22 animal species were characterized and compared with human strains isolated between 1986-2006 in Sweden. Although many animals and humans shared pulsovars, they did not appear at the same time or with the same proportion of strains. The pulsovars shared by both animals and humans may indicate that there is an exchange of L. monocytogenes strains between these two groups due to either direct or indirect transmission.

     

    List of papers
    1. Isolation of Listeria monocytogenes from human clinical cases in India
    Open this publication in new window or tab >>Isolation of Listeria monocytogenes from human clinical cases in India
    Show others...
    (English)Manuscript (preprint) (Other academic)
    National Category
    Medical Biotechnology
    Research subject
    Biomedicine
    Identifiers
    urn:nbn:se:oru:diva-15595 (URN)
    Available from: 2011-05-17 Created: 2011-05-17 Last updated: 2017-10-17Bibliographically approved
    2. Characterization of human invasive isolates of Listeria monocytogenes in Sweden 1986-2007
    Open this publication in new window or tab >>Characterization of human invasive isolates of Listeria monocytogenes in Sweden 1986-2007
    Show others...
    2008 (English)In: Foodborne pathogens and disease, ISSN 1535-3141, E-ISSN 1556-7125, Vol. 5, no 6, p. 755-761Article in journal (Refereed) Published
    Abstract [en]

    Since 1986, 68% of the Listeria monocytogenes isolates from human cases of invasive listeriosis in Sweden are available for retrospective studies. The aim of the present study was to characterize 601 human invasive isolates of L. monocytogenes in Sweden from 1986 to 2007 by using serotyping and pulsed-field gel electrophoresis. Since 1996, serovar 4b was permanently reduced to the second or third most common serovar in human cases in Sweden. During the latter period, 2000-2007, only 13% belonged to serovar 4b and 71% to 1/2a. The dendrogram, based on pulsovars, reveals two clusters with different serovars. Cluster 1 exhibits serovars 4b and 1/2b, whereas cluster 2 consists of serovar 1/2a. Serovar 1/2a seems to be more heterogeneous than serovar 4b.

    Place, publisher, year, edition, pages
    Mary Ann Liebert, 2008
    Keywords
    Invasive, Listeria monocytogenes, retrospective
    National Category
    Microbiology in the medical area
    Research subject
    Microbiology; Culinary Arts and Meal Science
    Identifiers
    urn:nbn:se:oru:diva-2997 (URN)10.1089/fpd.2008.0123 (DOI)000262028400007 ()18847381 (PubMedID)2-s2.0-57749091480 (Scopus ID)
    Note

    The work is done in cooperation with the School of Hospitality, Culinary Arts & Meal Science, Örebro University

    Available from: 2008-09-05 Created: 2008-09-05 Last updated: 2018-01-13Bibliographically approved
    3. Isolation and characterization of Listeria species from tropical seafoods
    Open this publication in new window or tab >>Isolation and characterization of Listeria species from tropical seafoods
    2008 (English)In: Food Control, ISSN 0956-7135, E-ISSN 1873-7129, Vol. 19, no 6, p. 566-569Article in journal (Refereed) Published
    Abstract [en]

    The incidence of Listeria species in the seafood of markets in Goa, India was studied. One hundred and fifteen raw/fresh seafoods bought at the fish markets were sampled and tested for presence of Listeria spp. using a two step enrichment procedure, followed by plating on two selective agars. The confirmation of the isolates was based on biochemical identification. Twenty eight seafood samples were positive for Listeria spp. and in 10 samples Listeria monocytogenes was detected. L.innocua was the most common Listeria species recovered and was detected in 18 samples. L. monocytogenes in raw seafood may pose a health risk in kitchen if contaminating ready-to-eat food.

    Place, publisher, year, edition, pages
    Amsterdam: Elsevier, 2008
    National Category
    Medical and Health Sciences Microbiology in the medical area Social Sciences
    Research subject
    Microbiology; Culinary Arts and Meal Science; Biomedicine
    Identifiers
    urn:nbn:se:oru:diva-2998 (URN)10.1016/j.foodcont.2007.06.009 (DOI)
    Note

    The work is done in cooperation with the School of Hospitality, Culinary Arts & Meal Science, Örebro University

    Available from: 2008-09-05 Created: 2008-09-05 Last updated: 2018-01-13Bibliographically approved
    4. Gravad (Gravlax) and cold-smoked salmon, still a potential source of listeriosis
    Open this publication in new window or tab >>Gravad (Gravlax) and cold-smoked salmon, still a potential source of listeriosis
    Show others...
    2009 (English)In: Journal of Foodservice, ISSN 1748-0140, Vol. 20, no 1, p. 15-20Article in journal (Refereed) Published
    Abstract [en]

    Gravad (Gravlax) and cold-smoked salmon are associated with human listeriosis in Sweden. The present investigation of Listeria monocytogenes in salmon was a follow-up of a similar study in the middle of the 1990s. Since our first study, there has been an increasing focus on food hygiene in general and specially on self-inspection and Hazard Analysis and Critical Control Points from the authorities and food producers. L. monocytogenes was isolated from 11 (three manufacturers) of the 56 products analyzed. The highest level of L. monocytogenes was 1500 cfu/g from a cold-smoked salmon product; however, the level was low (<100 cfu/g) in most products. Serovar 1/2a was predominant, followed by 4b. restriction enzyme analysis/ pulsed-field gel electrophoresis typing of the 56 salmon isolates identified five types of L. monocytogenes. One type was identical to a human type, whereas two other were closely related. These findings suggest that gravad and coldsmoked salmon are still possible sources of listeriosis in Sweden.

    Place, publisher, year, edition, pages
    Oxford: Blackwell Publishing, 2009
    National Category
    Medical and Health Sciences
    Research subject
    Culinary Arts and Meal Science; Biomedicine
    Identifiers
    urn:nbn:se:oru:diva-2999 (URN)10.1111/j.1748-0159.2008.00118.x (DOI)
    Available from: 2008-09-05 Created: 2008-09-05 Last updated: 2020-01-28Bibliographically approved
    5. Isolation of Listeria species from farm bulk milk at the receiving dairy plant and cervico-vaginal swabs
    Open this publication in new window or tab >>Isolation of Listeria species from farm bulk milk at the receiving dairy plant and cervico-vaginal swabs
    Show others...
    2007 (English)In: Indian Journal of Comparative Microbiology, Immunology and Infectious Diseases, ISSN 0974-0147, Vol. 28, no 1/2, p. 53-55Article in journal (Refereed) Published
    Abstract [en]

    Listeria species were isolated from farm bulk milk (n=123) at the receiving dairy plant and cervico-vaginal samples (n=20) collected from dairy cows with reproductive disorders. Following enrichment and plating on two selective agar media, confirmation of the isolates was based on standard tests. Isolates were subjected to a PCR assay for detection of the hlyA gene. Overall, Listeria spp. were isolated from 30(24.4%) bulk milk samples and four (20%) cervico-vaginal swabs. Listeria monocytogenes was isolated from 17.9%, L. innocua from 1.6%, L. seeligeri from 3.3% and L. welshimeri from 1.6% bulk milk samples. Only L. monocytogenes (10%) and L. innocua (10%) could be isolated from cervico-vaginal swabs. The hlyA gene was detected in all L. monocytogenes isolates. These findings represent a public health risk where homemade unpasteurised milk and milk products are largely consumed.

    National Category
    Medical and Health Sciences Infectious Medicine
    Research subject
    Biomedicine
    Identifiers
    urn:nbn:se:oru:diva-3000 (URN)
    Available from: 2008-09-05 Created: 2008-09-05 Last updated: 2017-10-18Bibliographically approved
    6. Molecular characterisation of Listeria monocytogenes isolates from animals in Sweden and comparison with previously characterised human strains
    Open this publication in new window or tab >>Molecular characterisation of Listeria monocytogenes isolates from animals in Sweden and comparison with previously characterised human strains
    Show others...
    (English)Manuscript (preprint) (Other academic)
    National Category
    Medical Biotechnology
    Research subject
    Biomedicine
    Identifiers
    urn:nbn:se:oru:diva-26575 (URN)
    Available from: 2012-12-03 Created: 2012-12-03 Last updated: 2017-10-17Bibliographically approved
  • 5.
    Parihar, Vishal Singh
    et al.
    Örebro University, School of Health and Medical Sciences.
    Barbuddhe, Sukhadeo B.
    Chakurkar, E.B.
    Danielsson-Tham, Marie-Louise
    Örebro University, Department of Restaurant & Culinary Arts.
    Tham, Wilhelm
    Örebro University, Department of Restaurant & Culinary Arts.
    Isolation of Listeria species from farm bulk milk at the receiving dairy plant and cervico-vaginal swabs2007In: Indian Journal of Comparative Microbiology, Immunology and Infectious Diseases, ISSN 0974-0147, Vol. 28, no 1/2, p. 53-55Article in journal (Refereed)
    Abstract [en]

    Listeria species were isolated from farm bulk milk (n=123) at the receiving dairy plant and cervico-vaginal samples (n=20) collected from dairy cows with reproductive disorders. Following enrichment and plating on two selective agar media, confirmation of the isolates was based on standard tests. Isolates were subjected to a PCR assay for detection of the hlyA gene. Overall, Listeria spp. were isolated from 30(24.4%) bulk milk samples and four (20%) cervico-vaginal swabs. Listeria monocytogenes was isolated from 17.9%, L. innocua from 1.6%, L. seeligeri from 3.3% and L. welshimeri from 1.6% bulk milk samples. Only L. monocytogenes (10%) and L. innocua (10%) could be isolated from cervico-vaginal swabs. The hlyA gene was detected in all L. monocytogenes isolates. These findings represent a public health risk where homemade unpasteurised milk and milk products are largely consumed.

  • 6.
    Parihar, Vishal Singh
    et al.
    Örebro University, School of Health and Medical Sciences.
    Barbuddhe, Sukhadeo B.
    Kalorey, Dewanand R.
    Khandait, Vinod Y.
    Danielsson-Tham, Marie-Louise
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Tham, Wilhelm
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Isolation of Listeria monocytogenes from human clinical cases in IndiaManuscript (preprint) (Other academic)
  • 7.
    Parihar, Vishal Singh
    et al.
    Örebro University, School of Health and Medical Sciences.
    Barbuddhe, Sukhadeo
    Danielsson-Tham, Marie-Louise
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Tham, Wilhelm
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Isolation and characterization of Listeria species from tropical seafoods2008In: Food Control, ISSN 0956-7135, E-ISSN 1873-7129, Vol. 19, no 6, p. 566-569Article in journal (Refereed)
    Abstract [en]

    The incidence of Listeria species in the seafood of markets in Goa, India was studied. One hundred and fifteen raw/fresh seafoods bought at the fish markets were sampled and tested for presence of Listeria spp. using a two step enrichment procedure, followed by plating on two selective agars. The confirmation of the isolates was based on biochemical identification. Twenty eight seafood samples were positive for Listeria spp. and in 10 samples Listeria monocytogenes was detected. L.innocua was the most common Listeria species recovered and was detected in 18 samples. L. monocytogenes in raw seafood may pose a health risk in kitchen if contaminating ready-to-eat food.

  • 8.
    Parihar, Vishal Singh
    et al.
    Örebro University, School of Health and Medical Sciences.
    Lopez-Valladares, G.
    Danielsson-Tham, Marie-Louise
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Helmersson, S.
    Barbuddhe, Sukhadeo B.
    Båverud, V.
    Tham, Wilhelm
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Molecular characterisation of Listeria monocytogenes isolates from animals in Sweden and comparison with previously characterised human strainsManuscript (preprint) (Other academic)
  • 9.
    Parihar, Vishal Singh
    et al.
    Örebro University, Department of Restaurant & Culinary Arts. Department of Clinical Medicine, Örebro University Hospital, Örebro, Sweden.
    Lopez-Valladares, Gloria
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Danielsson-Tham, Marie-Louise
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Peiris, Inoka
    Helmersson, Seved
    Department of Environmental Assessment, SLU, Uppsala, Sweden.
    Unemo, Magnus
    Örebro University, School of Health and Medical Sciences. Department of Clinical Microbiology, Örebro University Hospital, Örebro, Sweden.
    Andersson, Birgitta
    Department of Bacteriology, Malmö University Hospital, Malmö, Sweden.
    Arneborn, Malin
    The Swedish Institute for Infectious Disease Control and MTC, Karolinska Institutet, Solna, Sweden.
    Bannerman, Elizabeth
    Centre National des Listeria, Institut de Microbiologie, Lausanne, Switzerland.
    Barbuddhe, Sukhadeo
    ICAR Research Complex for Goa, Old Goa, India.
    Bille, Jacques
    Centre National des Listeria, Institut de Microbiologie, Lausanne, Switzerland.
    Hajdu, Lajos
    AstraZeneca AB, Södertälje, Sweden.
    Jacquet, Christine
    Laboratoire des Listeria, Institut Pasteur, Paris, France.
    Johansson, Christina
    The Swedish Institute for Infectious Disease Control and MTC, Karolinska Institutet, Solna, Sweden.
    Löfdahl, Margareta
    The Swedish Institute for Infectious Disease Control and MTC, Karolinska Institutet, Solna, Sweden.
    Möllerberg, Gunnel
    The Swedish Institute for Infectious Disease Control and MTC, Karolinska Institutet, Solna, Sweden.
    Ringberg, Håkan
    Regional Centre for Communicable Disease Control and Prevention, Malmö, Sweden.
    Rocourt, Jocelyne
    Centre Pasteur du Cameroun, Yaounde, Cameroon.
    Tjernberg, Ingela
    Department of Bacteriology, Malmö University Hospital, Malmö, Sweden.
    Ursing, Jan
    Department of Bacteriology, Malmö University Hospital, Malmö, Sweden.
    Henriques-Normark, Birgitta
    The Swedish Institute for Infectious Disease Control and MTC, Karolinska Institutet, Solna, Sweden.
    Tham, Wilhelm
    Örebro University, School of Hospitality, Culinary Arts & Meal Science. Department of Restaurant and Culinary Arts, Örebro University, Grythyttan, Sweden.
    Characterization of human invasive isolates of Listeria monocytogenes in Sweden 1986-20072008In: Foodborne pathogens and disease, ISSN 1535-3141, E-ISSN 1556-7125, Vol. 5, no 6, p. 755-761Article in journal (Refereed)
    Abstract [en]

    Since 1986, 68% of the Listeria monocytogenes isolates from human cases of invasive listeriosis in Sweden are available for retrospective studies. The aim of the present study was to characterize 601 human invasive isolates of L. monocytogenes in Sweden from 1986 to 2007 by using serotyping and pulsed-field gel electrophoresis. Since 1996, serovar 4b was permanently reduced to the second or third most common serovar in human cases in Sweden. During the latter period, 2000-2007, only 13% belonged to serovar 4b and 71% to 1/2a. The dendrogram, based on pulsovars, reveals two clusters with different serovars. Cluster 1 exhibits serovars 4b and 1/2b, whereas cluster 2 consists of serovar 1/2a. Serovar 1/2a seems to be more heterogeneous than serovar 4b.

  • 10.
    Peiris, Inoka Priyadarshani
    et al.
    Restaurang- och hotellhögskolan - Grythytte akademi, School of Hospitality, Culinary Arts & Meal Science.
    Lopez-Valladares, Gloria
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Parihar, Vishal Singh
    Örebro University, School of Health and Medical Sciences.
    Helmersson, Seved
    Barbuddhe, Sukdevo
    Tham, Wilhelm
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Danielsson-Tham, Marie-Louise
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Gravad (Gravlax) and cold-smoked salmon, still a potential source of listeriosis2009In: Journal of Foodservice, ISSN 1748-0140, Vol. 20, no 1, p. 15-20Article in journal (Refereed)
    Abstract [en]

    Gravad (Gravlax) and cold-smoked salmon are associated with human listeriosis in Sweden. The present investigation of Listeria monocytogenes in salmon was a follow-up of a similar study in the middle of the 1990s. Since our first study, there has been an increasing focus on food hygiene in general and specially on self-inspection and Hazard Analysis and Critical Control Points from the authorities and food producers. L. monocytogenes was isolated from 11 (three manufacturers) of the 56 products analyzed. The highest level of L. monocytogenes was 1500 cfu/g from a cold-smoked salmon product; however, the level was low (<100 cfu/g) in most products. Serovar 1/2a was predominant, followed by 4b. restriction enzyme analysis/ pulsed-field gel electrophoresis typing of the 56 salmon isolates identified five types of L. monocytogenes. One type was identical to a human type, whereas two other were closely related. These findings suggest that gravad and coldsmoked salmon are still possible sources of listeriosis in Sweden.

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