Thirteenth CRL-Salmonella interlaboratory comparison study (2008) on typing of Salmonella spp. : Dertiende CRL-Salmonella ringonderzoek (2008) voor de typering van Salmonella spp.
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RIVM report 330604013Type
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Thirteenth CRL-Salmonella interlaboratory comparison study (2008) on typing of Salmonella spp. : Dertiende CRL-Salmonella ringonderzoek (2008) voor de typering van Salmonella spp.Publiekssamenvatting
De Nationale Referentie Laboratoria (NRL's) van de 27 Europese lidstaten scoorden goed bij de kwaliteitscontrole op Salmonella-typering in 2008. Vier laboratoria hadden hiervoor een herkansing nodig. Daarnaast is een analyse van alle NRL's als groep uitgevoerd, waaruit bleek dat zij 97 % van de stammen de juiste naam konden geven. Aangezien een NRL de studie op een later tijdstip uitvoerde, konden deze data daar niet bij worden meegenomen.Sinds 1992 zijn deze laboratoria verplicht om deel te nemen aan deze kwaliteitstoets, het zogeheten ringonderzoek voor de typering van Salmonella. Elke lidstaat wijst een laboratorium aan, het Nationale Referentie Laboratorium (NRL), dat Salmonella afkomstig uit monsters van levensmiddelen of dieren aantoont en typeert. Jaarlijks wordt gecontroleerd of de laboratoria hun werk goed uitvoeren. Soms doen ook landen buiten de Europese Unie mee, zoals dit jaar twee landen die zijn aangesloten bij de European Free Trade Association (EFTA).
De laboratoria krijgen 20 stammen Salmonella opgestuurd waarvan zij de juiste naam moeten achterhalen. Enkele NRL's zijn bovendien op hun expertise getoetst om een subtypering van soorten Salmonella te maken. Ze kregen 10 stammen voorgelegd van 2 soorten, te weten Salmonella Enteritidis en Salmonella Typhimurium. De NRL's hebben 97 % van de S. Typhimurium-stammen goed getypeerd. Het was iets lastiger de S. Enteritidis-stammen te typeren. De NRL's konden 94 % van deze stammen goed typeren.
De organisatie van het ringonderzoek is in handen van het Communautair Referentie Laboratorium (CRL) voor Salmonella (CRL-Salmonella). Het CRL-Salmonella is ondergebracht bij het Nationaal Instituut voor Volksgezondheid en Milieu (RIVM), Bilthoven, Nederland. De organisatie van dit ringonderzoek wordt uitgevoerd in samenwerking met de Health Protection Agency (HPA) in Londen, Engeland.
The National Reference Laboratories (NRLs) of all 27 European Member States performed well on the 2008 quality control test on Salmonella typing. The 4 laboratories which repeated the test also obtained good scores. An analysis of the pooled results from all NRLs revealed that the NRLs taken as a whole were able to assign the correct name to 97 % of the strains tested. One NRL performed the test at a relatively late date and, consequently, its data could not be included in the group analysis.
Since 1992, the NRLs have been required to participate in an annual quality control test, which consists of an interlaboratory comparison study for Salmonella typing. Each Member State designates a specific laboratory within their national boundaries to be responsible for the detection and identification of Salmonella strains from samples isolated from animals and/or food products. These laboratories are then referred to as the National Reference Laboratories. The performance of the NRLs is assessed annually based on their capability to correctly identify 20 Salmonella strains. NRLs from countries outside the European Union occasionally participate in these tests, and NRLs from 2 countries belonging to the European Free Trade Association (EFTA) took part in the 2008 test.
The expertise of a number of NRLs was subjected to more severe testing by having not only to identify the 20 Salmonella strains of the quality control test but also to subtype (phage typing) various other Salmonella strains. As such, these laboratories received 10 strains of each of Salmonella Enteritidis and Salmonella Typhimurium. These NRLs typed 97 % of the S. Typhimurium strains correctly. The typing of S. Enteritidis strains proved to be more troublesome, with the NRLs typing 94 % of the strains correctly.
The Community Reference Laboratory for Salmonella (CRL-Salmonella) organises this annual interlaboratory comparison study in cooperation with the Health Protection Agency in London, UK. The CRL-Salmonella is situated at the National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands.
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