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Featured researches published by Thomas Alter.


Epidemiology and Infection | 2005

The importance of Campylobacter coli in human campylobacteriosis: prevalence and genetic characterization

Michael Gürtler; Thomas Alter; Sandra Kasimir; Karsten Fehlhaber

The primary aim of this study was to detect and genotype Campylobacter coli strains from humans over a period of one year from November 2002 to October 2003. Campylobacter spp. were isolated from patients with symptoms of enteric infection. Amplified fragment length polymorphism (AFLP) analysis was used to identify the genetic diversity of C. coli strains by cluster analysis. A total of 18.6% of all Campylobacter isolates were identified as C. coli. These data show, that C. coli is indeed of importance to human campylobacter infections. Heterogeneous patterns were detectable among the human C. coli pool by AFLP analysis suggesting different sources of infection. A continuous seasonal shift of genotypes was detectable.


Bundesgesundheitsblatt-gesundheitsforschung-gesundheitsschutz | 2009

Tasks and duties of veterinary reference laboratories for food borne zoonoses

Lüppo Ellerbroek; Thomas Alter; Reimar Johne; K. Nöckler; L. Beutin; Reiner Helmuth

Reference laboratories are of central importance for consumer protection. Field expertise and high scientific competence are basic requirements for the nomination of a national reference laboratory. To ensure a common approach in the analysis of zoonotic hazards, standards have been developed by the reference laboratories together with national official laboratories on the basis of Art. 33 of Directive (EG) No. 882/2004. Reference laboratories function as arbitrative boards in the case of ambivalent or debatable results. New methods for detection of zoonotic agents are developed and validated to provide tools for analysis, e. g., in legal cases, if results from different parties are disputed. Besides these tasks, national reference laboratories offer capacity building and advanced training courses and control the performance of ring trials to ensure consistency in the quality of analyses in official laboratories. All reference laboratories work according to the ISO standard 17025 which defines the grounds for strict laboratory quality rules and in cooperation with the respective Community Reference Laboratories (CRL). From the group of veterinary reference laboratories for food-borne zoonoses, the national reference laboratories are responsible for Listeria monocytogenes, for Campylobacter, for the surveillance and control of viral and bacterial contamination of bivalve molluscs, for E. coli, for the performance of analysis and tests on zoonoses (Salmonella), and from the group of parasitological zoonotic agents, the national reference laboratory for Trichinella.ZusammenfassungReferenzlaboratorien sind für den gesundheitlichen Verbraucherschutz von zentraler Bedeutung. Auf Basis der Verordnung (EG) Nr. 882/2004 werden gemeinsam mit den Behörden der Länder in Deutschland die Standards erarbeitet, nach denen die in der Lebensmittelüberwachung tätigen Untersuchungslaboratorien arbeiten. Referenzlaboratorien fungieren auch als Schiedsstelle im Falle unklarer oder strittiger Befunde. Neue Untersuchungsmethoden werden entwickelt und validiert, mit denen Mikroorganismen in Lebensmitteln zuverlässig und gerichtsfest nachgewiesen werden können. Fachkompetenz und hohe wissenschaftliche Qualität in der experimentellen Arbeit sind daher die Grundvoraussetzung, um ein Labor in einer wissenschaftlichen Einrichtung zum Referenzlaboratorium zu ernennen. Die Referenzlabore bieten eine Aus- und Weiterbildung von Fachleuten aus den Überwachungsbehörden der Länder an, und sie stellen Referenzmaterialien und Fachinformationen zur Durchführung von Vergleichsuntersuchungen zur Verfügung. Ringversuche und Laborvergleichsuntersuchungen mit den Laboratorien der amtlichen Überwachung im Rahmen der Qualitätssicherung gewährleisten ein einheitliches Niveau der Analysenqualität. Alle Referenzlaboratorien arbeiten gemäß den Vorgaben der Norm ISO 17025 unter akkreditierten Bedingungen. Aus der Gruppe der lebensmittelbedingten mikrobiologischen bzw. viralen Zoonosen werden die Nationalen Referenzlaboratorien für Listeria monocytogenes, für Campylobacter, für die Überwachung von Viren und Bakterien in zweischaligen Weichtieren, für Escherichia coli, zur Durchführung von Analysen und Tests auf Zoonosen (Salmonellen) sowie aus der Gruppe der lebensmittelbedingten parasitären Zoonosen das Nationale Referenzlabor für Trichinella vorgestellt.AbstractReference laboratories are of central importance for consumer protection. Field expertise and high scientific competence are basic requirements for the nomination of a national reference laboratory. To ensure a common approach in the analysis of zoonotic hazards, standards have been developed by the reference laboratories together with national official laboratories on the basis of Art. 33 of Directive (EG) No. 882/2004. Reference laboratories function as arbitrative boards in the case of ambivalent or debatable results. New methods for detection of zoonotic agents are developed and validated to provide tools for analysis, e. g., in legal cases, if results from different parties are disputed. Besides these tasks, national reference laboratories offer capacity building and advanced training courses and control the performance of ring trials to ensure consistency in the quality of analyses in official laboratories. All reference laboratories work according to the ISO standard 17025 which defines the grounds for strict laboratory quality rules and in cooperation with the respective Community Reference Laboratories (CRL). From the group of veterinary reference laboratories for food-borne zoonoses, the national reference laboratories are responsible for Listeria monocytogenes, for Campylobacter, for the surveillance and control of viral and bacterial contamination of bivalve molluscs, for E. coli, for the performance of analysis and tests on zoonoses (Salmonella), and from the group of parasitological zoonotic agents, the national reference laboratory for Trichinella.


Bundesgesundheitsblatt-gesundheitsforschung-gesundheitsschutz | 2009

Aufgaben der veterinärmedizinischen Referenzlaboratorien im Bereich der lebensmittelbedingten Zoonosen@@@Tasks and duties of veterinary reference laboratories for food borne zoonoses

Lüppo Ellerbroek; Thomas Alter; Reimar Johne; K. Nöckler; L. Beutin; Reiner Helmuth

Reference laboratories are of central importance for consumer protection. Field expertise and high scientific competence are basic requirements for the nomination of a national reference laboratory. To ensure a common approach in the analysis of zoonotic hazards, standards have been developed by the reference laboratories together with national official laboratories on the basis of Art. 33 of Directive (EG) No. 882/2004. Reference laboratories function as arbitrative boards in the case of ambivalent or debatable results. New methods for detection of zoonotic agents are developed and validated to provide tools for analysis, e. g., in legal cases, if results from different parties are disputed. Besides these tasks, national reference laboratories offer capacity building and advanced training courses and control the performance of ring trials to ensure consistency in the quality of analyses in official laboratories. All reference laboratories work according to the ISO standard 17025 which defines the grounds for strict laboratory quality rules and in cooperation with the respective Community Reference Laboratories (CRL). From the group of veterinary reference laboratories for food-borne zoonoses, the national reference laboratories are responsible for Listeria monocytogenes, for Campylobacter, for the surveillance and control of viral and bacterial contamination of bivalve molluscs, for E. coli, for the performance of analysis and tests on zoonoses (Salmonella), and from the group of parasitological zoonotic agents, the national reference laboratory for Trichinella.ZusammenfassungReferenzlaboratorien sind für den gesundheitlichen Verbraucherschutz von zentraler Bedeutung. Auf Basis der Verordnung (EG) Nr. 882/2004 werden gemeinsam mit den Behörden der Länder in Deutschland die Standards erarbeitet, nach denen die in der Lebensmittelüberwachung tätigen Untersuchungslaboratorien arbeiten. Referenzlaboratorien fungieren auch als Schiedsstelle im Falle unklarer oder strittiger Befunde. Neue Untersuchungsmethoden werden entwickelt und validiert, mit denen Mikroorganismen in Lebensmitteln zuverlässig und gerichtsfest nachgewiesen werden können. Fachkompetenz und hohe wissenschaftliche Qualität in der experimentellen Arbeit sind daher die Grundvoraussetzung, um ein Labor in einer wissenschaftlichen Einrichtung zum Referenzlaboratorium zu ernennen. Die Referenzlabore bieten eine Aus- und Weiterbildung von Fachleuten aus den Überwachungsbehörden der Länder an, und sie stellen Referenzmaterialien und Fachinformationen zur Durchführung von Vergleichsuntersuchungen zur Verfügung. Ringversuche und Laborvergleichsuntersuchungen mit den Laboratorien der amtlichen Überwachung im Rahmen der Qualitätssicherung gewährleisten ein einheitliches Niveau der Analysenqualität. Alle Referenzlaboratorien arbeiten gemäß den Vorgaben der Norm ISO 17025 unter akkreditierten Bedingungen. Aus der Gruppe der lebensmittelbedingten mikrobiologischen bzw. viralen Zoonosen werden die Nationalen Referenzlaboratorien für Listeria monocytogenes, für Campylobacter, für die Überwachung von Viren und Bakterien in zweischaligen Weichtieren, für Escherichia coli, zur Durchführung von Analysen und Tests auf Zoonosen (Salmonellen) sowie aus der Gruppe der lebensmittelbedingten parasitären Zoonosen das Nationale Referenzlabor für Trichinella vorgestellt.AbstractReference laboratories are of central importance for consumer protection. Field expertise and high scientific competence are basic requirements for the nomination of a national reference laboratory. To ensure a common approach in the analysis of zoonotic hazards, standards have been developed by the reference laboratories together with national official laboratories on the basis of Art. 33 of Directive (EG) No. 882/2004. Reference laboratories function as arbitrative boards in the case of ambivalent or debatable results. New methods for detection of zoonotic agents are developed and validated to provide tools for analysis, e. g., in legal cases, if results from different parties are disputed. Besides these tasks, national reference laboratories offer capacity building and advanced training courses and control the performance of ring trials to ensure consistency in the quality of analyses in official laboratories. All reference laboratories work according to the ISO standard 17025 which defines the grounds for strict laboratory quality rules and in cooperation with the respective Community Reference Laboratories (CRL). From the group of veterinary reference laboratories for food-borne zoonoses, the national reference laboratories are responsible for Listeria monocytogenes, for Campylobacter, for the surveillance and control of viral and bacterial contamination of bivalve molluscs, for E. coli, for the performance of analysis and tests on zoonoses (Salmonella), and from the group of parasitological zoonotic agents, the national reference laboratory for Trichinella.


Food Microbiology | 2005

Distribution of Campylobacter jejuni strains at different stages of a turkey slaughter line

Thomas Alter; Florian Gaull; Annekathrin Froeb; Karsten Fehlhaber


Veterinary Microbiology | 2005

Prevalences and transmission routes of Campylobacter spp. strains within multiple pig farms.

Thomas Alter; Florian Gaull; Sandra Kasimir; Michael Gürtler; Hans Mielke; Mechthild Linnebur; Karsten Fehlhaber


Berliner Und Munchener Tierarztliche Wochenschrift | 2001

Transport stress--consequences for bacterial translocation, endogenous contamination and bactericidal activity of serum of slaughter pigs.

Tassilo Seidler; Thomas Alter; Monika Krüger; Karsten Fehlhaber


Food Microbiology | 2006

Influence of inoculation levels and processing parameters on the survival of Campylobacter jejuni in German style fermented turkey sausages

Thomas Alter; Anouchka Bori; Ahmad Hamedi; Lüppo Ellerbroek; Karsten Fehlhaber


Berliner Und Munchener Tierarztliche Wochenschrift | 2005

Vorkommen und genetische Charakterisierung von porcinen Campylobacter coli -Isolaten

Thomas Alter; F. Gaull; S. Kasimir; M. Gürtler; Karsten Fehlhaber


International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork | 2003

Comparison of Campylobacter coli strains isolated from pigs and humans - porcine strains a possible source of human infection?

Michael Gürtler; Thomas Alter; Sandra Kasimir; Karsten Fehlhaber


International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork | 2001

Campylobacter in pigs: an epidemiological study

Florian Gaull; Thomas Alter; Annekathrin Froeb; Karsten Fehlhaber

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Reimar Johne

Federal Institute for Risk Assessment

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Reiner Helmuth

Federal Institute for Risk Assessment

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Hans Mielke

Federal Institute for Risk Assessment

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