EU Interlaboratory comparison study primary production XVI (2013) : Detection of Salmonella in chicken faeces adhering to boot socks
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Series/Report no.RIVM report 330604031
MetadataShow full item record
TitleEU Interlaboratory comparison study primary production XVI (2013) : Detection of Salmonella in chicken faeces adhering to boot socks
Translated TitleEU Ringonderzoek primaire productie XVI (2013) : Detectie van Salmonella in overschoenen met kippenmest
PubliekssamenvattingIn 2013 waren alle 36 Nationale Referentie Laboratoria (NRL's) in de Europese Unie in staat om hoge en lage concentraties Salmonella in een stal met leghennen (kippenmest) aan te tonen. Ze behaalden direct het gewenste niveau. In totaal hebben de laboratoria in 96 procent van de besmette monsters Salmonella opgespoord. Dit blijkt uit het zestiende ringonderzoek met materiaal van de dieren (zoals uitwerpselen) dat werd georganiseerd door het referentielaboratorium van de Europese Unie voor Salmonella (EURLSalmonella). Voor dit soort onderzoek zijn monsters van de uitwerpselen van kippen verzameld door met overschoenen door de stal te 'wandelen' (omgevingsmateriaal).
Ringonderzoek verplicht voor Europese lidstaten
Het onderzoek is in maart 2013 gehouden. Alle NRL's van de Europese lidstaten die verantwoordelijk zijn voor de opsporing van Salmonella in dierlijke mest, zijn verplicht om aan het onderzoek deel te nemen. Het EURL-Salmonella is gevestigd bij het Nederlandse Rijksinstituut voor Volksgezondheid en Milieu (RIVM).
De laboratoria toonden de Salmonella-bacterie in de overschoenen met kippenmest aan met behulp van de internationaal voorgeschreven analysemethode (MSRV). Elk laboratorium kreeg een pakket toegestuurd met overschoenen waaraan kippenmest zat met Salmonella in twee verschillende concentraties of zonder Salmonella. De laboratoria dienden de monsters volgens een protocol te onderzoeken op de aanwezigheid van Salmonella.
Voor het eerst is het te onderzoeken materiaal (matrix) op het laboratorium van het EURL-Salmonella kunstmatig besmet met een verdunde cultuur van een Salmonella Typhimurium. Het laboratorium van het EURL-Salmonella heeft voor dit soort studies onderzocht hoe de monsters op deze wijze optimaal kunnen worden aangeleverd. De NRL's vinden deze werkwijze positief, omdat zijzelf niet meer de monsters met de Salmonella hoeven samen te voegen; dit was in eerdere studies wel het geval. Deze werkwijze wordt daarom voorgezet, al wordt per studie bekeken of het haalbaar is. Een andere vernieuwing is dat de deelnemende laboratoria hun bevindingen via internet konden aanleveren. De NRL's vonden ook dit een verbetering, en voor het analyserend EURL zijn de gegevens eenvoudiger te analyseren. Besloten is deze werkwijze te optimaliseren en voort te zetten.
In 2013, all 36 National Reference Laboratories (NRLs) in the European Union were able to detect high and low levels of Salmonella in chicken faeces collected from stables with laying hens. The laboratories achieved the desired level of good performance immediately. The laboratories detected Salmonella in 96% of the contaminated samples. This is evident from the 16th interlaboratory comparison study of primary production samples (such as chicken faeces), which was organized by the European Union Reference Laboratory for Salmonella (EURL-Salmonella). In this study, environmental material was collected by researchers walking through the stable wearing overshoes (boot socks).
Interlaboratory comparison study obligatory for EU Member States
The study was conducted in March 2013. Participation was obligatory for all EU Member State NRLs which are responsible for the detection of Salmonella in samples from primary production. EURL-Salmonella is part of the Dutch National Institute for Public Health and the Environment (RIVM).
The laboratories used the internationally prescribed Modified Semi-solid Rappaport-Vassiliadis (MSRV) method to detect the presence of Salmonella in chicken faeces adhering to boot socks. Each laboratory received a package of boot socks containing chicken faeces with two different concentrations of Salmonella, or containing no Salmonella at all. The laboratories were required to analyse the samples for the presence of Salmonella in accordance with the study protocol.
For the first time, the samples (matrix) were artificially contaminated with a diluted culture of Salmonella Typhimurium at the EURL-Salmonella laboratory. The EURL-Salmonella laboratory investigated the optimal sample delivery procedure for this type of study. The procedure used was positively received by the NRLs because they themselves were no longer required to combine the Salmonella samples, as was the case in previous studies. This procedure will therefore continue to be used in future studies, although its feasibility will be assessed for each study. A further innovation was that the participating laboratories were able to submit their findings via the Internet. This change was also positively received by the NRLs, and made it easier for the EURL to analyse the data. It was decided to optimize this procedure and to continue using it.
SponsorsEuropean Commission (DG Sanco)
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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.Berk PA; Maas HME; de Pinna E; Mooijman KA; LZO; cib (Rijksinstituut voor Volksgezondheid en Milieu RIVMHealth Protection Agency HPA, 2010-11-04)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.
Sixteenth EURL-Salmonella interlaboratory comparison study (2011) on typing of Salmonella spp. : Zestiende EURL-Salmonella ringonderzoek (2011) voor de typering van Salmonella spp.Jacobs-Reitsma WF; Pol-Hofstad IE; Maas HME; de Pinna E; Mooijman KA; LZO; cib (Rijksinstituut voor Volksgezondheid en Milieu RIVM, 2012-10-24)The 28 National Reference Laboratories (NRLs) of all 27 European Union (EU) Member States performed well on the 2011 quality control test on Salmonella typing. Two laboratories were found to require a follow-up study on their first test. Altogether, the EU-NRLs were able to assign the correct name to 97% of the strains tested. Other participants interlaboratory comparison study Salmonella Since 1992, the NRLs of the EU Member States have been required to participate in annual quality control tests, which consist of interlaboratory comparison studies on Salmonella. Laboratories from countries outside the European Union, like EU-candidate countries, occasionally participate in these tests on a voluntary basis. Eight additional laboratories participated in the current study. Two EUcandidate countries amongst these eight additional participants did not meet the criteria for good performance in the first round. One of them did not reach this goal in the follow-up study either. The other was not able to participate in the follow-up study; a follow-up study is not compulsory for non-EU laboratories. Each EU Member State designates a specific laboratory within their national boundaries to be responsible for the detection and identification of Salmonella strains from animals and/or food products. These laboratories are then referred to as the National Reference Laboratories. The performance of these NRLs on Salmonella typing is assessed annually, based on their capability to correctly identify 20 Salmonella strains. Phage typing Nine NRLs not only serotyped the 20 Salmonella strains of the quality control test, but also subtyped 20 additional strains by phage typing. For this, the laboratories received ten strains of Salmonella Enteritidis and ten strains of Salmonella Typhimurium. These NRLs typed 98% of the S. Typhimurium strains correctly. Of the S. Enteritidis strains, 88% were phage typed correctly. The European Union Reference Laboratory for Salmonella (EURL-Salmonella) organises this annual interlaboratory comparison study on typing of Salmonella in cooperation with the Health Protection Agency in London, UK. The EURLSalmonella is situated at the National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands.
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