oru.sePublications
Change search
Refine search result
1 - 12 of 12
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Lopez-Valladares, Gloria
    et al.
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Danielsson-Tham, Marie-Louise
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Goering, Richard V.
    Med Ctr, Sch Med, Dept Med Microbiol & Immunol, Creighton Univ, Omaha CA, USA.
    Tham, Wilhelm
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Division of Human Listeria monocytogenes Pulsed-Field Gel Electrophoresis (PFGE) Types Belonging to Lineage I (Serovar 4b, 1/2b, and 3b) into PFGE Groups2015In: Foodborne pathogens and disease, ISSN 1535-3141, E-ISSN 1556-7125, Vol. 12, no 5, p. 447-453Article in journal (Refereed)
    Abstract [en]

    The 63 pulsed-field gel electrophoresis (PFGE) types identified among 427 clinical isolates of Listeria monocytogenes that were characterized in a previous study by serotyping and PFGE (AscI) could be further divided into 17 PFGE groups. While the 63 PFGE types, all part of lineage I, were established based on the number and distribution of all bands in each DNA profile, the 17 PFGE groups were based on the configuration of small bands with sizes L. monocytogenes serovar 4b isolates (n=334) were divided into 8 PFGE groups; the 32 PFGE types of serovar 1/2b isolates (n=90) and the serovar 3b isolates (n=3, 1 PFGE type) were divided into 9 PFGE groups. An association was observed between PFGE groups and serovars. L. monocytogenes isolates belonging to PFGE groups I, J, Q, R, X, Z, o-4, and o-5 all shared serovar 4b, whereas isolates from PFGE groups D, G, O, P, T, U, o-1, o-2, and o-3 shared serovar 1/2b. Small fragments L. monocytogenes isolates. From the results of the present study, a procedure for accelerating the identification of PFGE types when analyzing new PFGE profiles can be suggested. Therefore, we propose a stepwise procedure to PFGE profiling by first identifying the PFGE group using the smaller band patterns <145.5 kb, and then determining PFGE types based on the band patterns >145.5 kb.

  • 2.
    Lopez-Valladares, Gloria
    et al.
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Danielsson-Tham, Marie-Louise
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Goering, Richard V.
    Department of Medical Microbiology and Immunology, Creighton University Medical Center, School of Medicine, Omaha NE, USA.
    Tham, Wilhelm
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Lineage II (Serovar 1/2a and 1/2c) Human Listeria monocytogenes Pulsed-Field Gel Electrophoresis Types Divided into PFGE Groups Using the Band Patterns Below 145.5 kb2017In: Foodborne pathogens and disease, ISSN 1535-3141, E-ISSN 1556-7125, Vol. 14, no 1, p. 8-16Article in journal (Refereed)
    Abstract [en]

    Among 504 clinical lineage II isolates of Listeria monocytogenes isolated during 1958-2010 in Sweden, 119 pulsed-field gel electrophoresis (PFGE) types (AscI) have been identified based on the number and distribution of all banding patterns in each DNA profile. In this study, these types were further divided into PFGE groups based on the configuration of small bands with sizes <145.5 kb. The 504 isolates included 483 serovar 1/2a isolates distributed into 114 PFGE types and 21 serovar 1/2c isolates distributed into 9 PFGE types; these were further divided into 21 PFGE groups. PFGE group, that is, configuration of small bands below 145.5 kb, and serovars were correlated. L. monocytogenes isolates belonging to PFGE groups A, B, C, E, F, H, K, L, M, S, V, W, Y, and Ö-6 to Ö-12 shared serovar 1/2a, with one exception. PFGE group E also included two PFGE types sharing serovar 1/2c and four PFGE types belonging to either serovar 1/2a or 1/2c. Isolates belonging to PFGE group N shared serovar 1/2c. In contrast to lineage I isolates, small fragments <33.3 kb were visible in all L. monocytogenes isolates belonging to lineage II. In the results from both the present and previous studies, the genomic region of small bands was genetically more conservative than in large bands. The distribution of these small bands established the relatedness of strains and defined a genetic marker for both lineages I and II, while also establishing their serogroup. The division of L. monocytogenes PFGE types into PFGE groups is advantageous as the profile of every new isolate can be identified easily and quickly through first studying the PFGE group affiliation of the isolate based on the smaller band patterns <145.5 kb, and then identifying the PFGE type based on the band patterns >145.5 kb.

  • 3.
    Lopez-Valladares, Gloria
    et al.
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Danielsson-Tham, Marie-Louise
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Tham, Wilhelm
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Listeria monocytogenes: a threat to the health of restaurant guests2016In: 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. 35-35Conference paper (Refereed)
  • 4.
    Lopez-Valladares, Gloria
    et al.
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Danielsson-Tham, Marie-Louise
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Than, Wilhelm
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Listeriosis in South American camelids: a review2013In: Journal of Camel Practice and Research, ISSN 0971-6777, E-ISSN 2277-8934, Vol. 20, p. 129-132Article in journal (Refereed)
    Abstract [en]

    The main aim of the present study was to review the general aspects of Listeria and the clinical manifestation of the disease listeriosis in humans and domestic ruminants, with emphasis on clinical signs in South American camelids. Camelids are susceptible to infection by Listeria; however, it appears that the prevalence of listeriosis in camelids is low, given that few cases have been reported. The species Listeria monocytogenes is associated with all reported cases. To our knowledge, there are no reported cases of listeriosis in vicunas (Vicugna vicugna) and guanacos (Lama guanicoe).

    The clinical manifestations of listeriosis in llamas and alpacas are similar to in domestic ruminants and humans, namely meningoencephalitis, encephalitis, septicaemia, abortion, otitis media/interna and polyarthritis. Listerial mastitis and gastroenteritis has not yet been described in camelids. Despite reported cases, there is no specific mention of listeriosis associated with shedding of bacteria in faeces or milk. The occurrence of listeriosis in camelids needs to be confirmed and clinical signs defined.

  • 5.
    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.

  • 6.
    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.

  • 7.
    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.

  • 8.
    Tham, Wilhelm
    et al.
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    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.
    Humanisolat av Listeria monocytogenes under ett halvt sekel i Sverige2009In: Veterinärkongressen 2009 / [ed] P. Jonsson, B. Larsson, 2009, p. 91-92Conference paper (Other academic)
  • 9.
    Tham, Wilhelm
    et al.
    Örebro University, Department of Restaurant & Culinary Arts.
    Lopez-Valladares, Gloria
    Örebro University, Department of Restaurant & Culinary Arts.
    Helmersson, S.
    Österlund, A.
    Danielsson-Tham, Marie-Louise
    Örebro University, Department of Restaurant & Culinary Arts.
    More than one variant of Listeria monocytogenes isolated from each of two human cases of invasive listeriosis2007In: Epidemiology and Infection, ISSN 0950-2688, E-ISSN 1469-4409, Vol. 135, no 5, p. 854-856Article in journal (Refereed)
    Abstract [en]

    Two variants of Listeria monocytogenes were isolated from blood cultures from each of two patients with listeriosis. Each variant displayed a two-band difference in DNA profile from the other by pulsed-field gel electrophoresis. Although this difference in profile is insufficient to distinguish clearly between the variants, the possibility of co-infection with different strains of L. monocytogenes needs to be considered. We suggest that more than one colony should be selected for molecular typing to aid interpretation during investigation of the sources and routes of Listeria infection.

  • 10.
    Tham, Wilhelm
    et al.
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Lopez-Valladares, Gloria
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Wennström, Stefan
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Österlund, Anders
    Danielsson-Tham, Marie-Louise
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Appearance of two closely related variants of Listeria monocytogenes inblood from the same patient with invasive listeriosis2010In: Second Sympsoium on Food Associated Pathogens / [ed] Wilhelm Tham & Marie-Louiuse Danielsson-Tham, Grythyttan: Restaurang- och hotellhögskolan – Grythytte Akademi , 2010, p. Abstr 29-Conference paper (Other academic)
  • 11.
    Tham, Wilhem
    et al.
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Lopez-Valladares, Gloria
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Helmersson, Seved
    Swedish Univ Agr Sci, Dept Environm Assessment, Uppsala, Sweden.
    Wennström, Stefan
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Österlund, Anders
    Dept Communicable Dis Prevent & Control, Lulea, Sweden.
    Danielsson-Tham, Marie-Louise
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Occurrence of Genetic Variants of Listeria monocytogenes Strains2013In: Foodborne pathogens and disease, ISSN 1535-3141, E-ISSN 1556-7125, Vol. 10, no 9, p. 825-826Article in journal (Refereed)
    Abstract [en]

    Isolates of Listeria monocytogenes saved from outbreaks of listeriosis, cases of sporadic listeriosis, and similar events do not always belong to a solitary genetic variant. Variants of the same strain may have evolved from a unique clone, and plasmid loss or gain and phage-mediated genetic changes are suggested as the main mechanism. Some of these reports are summarized in this short communication.

  • 12.
    Thisted Lambertz, Susanne
    et al.
    National Food Agency, Uppsala, Sweden.
    Ivarsson, Sofie
    The Public Health agency of Sweden, Communicable Disease Control, Stockholm, Sweden.
    Lopez-Valladares, Gloria
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Sidstedt, M
    National Food Agency, Uppsala, Sweden.
    Lindqvist, Roland
    National Food Agency, Uppsala, Sweden.
    Subtyping of Listeria monocytogenes isolates recovered from retail ready-to-eat foods, processing plants and listeriosis patients in Sweden 20102013In: International Journal of Food Microbiology, ISSN 0168-1605, E-ISSN 1879-3460, Vol. 166, p. 186-192Article in journal (Refereed)
    Abstract [en]

    Identification and prioritisation of food safety interventions requires an understanding of the relationship be- tween food, pathogens and cases. Such understanding can be gained through different approaches, e.g. microbial subtyping to attribute cases of foodborne disease to food vehicles or other sources of illness. In this study, Listeria monocytogenes isolates (n = 166) from (i) three categories of ready-to-eat (RTE) foods, (ii) food processing plant environments, and (iii) human listeriosis cases, all sampled during 2010 in Sweden, were subtyped. In addition, 121 isolates from human listeriosis cases, collected 2005–2009, were subtyped. Subtyping consisted of both serotyping (conventional method and PCR) and genotyping using pulsed-field gel electrophoresis (PFGE). Serotype 1/2a dominated in all three groups of isolates (range 73–96%). Eighteen percent of the human isolates (2010) belonged to serotype 4b, but only 1.4% of the food isolates. The food isolates differentiated into 19 pulsotypes (ID = 0.843), the human isolates collected 2010 into 31 pulsotypes (ID = 0.950) and the processing plant isolates into 22 pulsotypes (ID = 0.991). Six of the pulsotypes were shared between the food and human isolates. These pulsotypes comprised 42% of the human isolates and 59% of the food isolates. For some processing plants, there was suggested persistence of one or more specific L. monocytogenes strains, as indicated by repetitive isolation of the same pulsotype from food. This study indicated the presence of L. monocytogenes in the processing plant environment as a likely source of contamination of gravad and cold-smoked fish, and this food category as an important source of human exposure to the pathogen

1 - 12 of 12
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf