EU interlaboratory comparison study primary production XVIII (2015) : Detection of Salmonella in pig faeces
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Series/Report no.RIVM report 2015-0082
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TitleEU interlaboratory comparison study primary production XVIII (2015) : Detection of Salmonella in pig faeces
Translated TitleEU-ringonderzoek primaire productie XVIII (2015) : Detectie van Salmonella in varkensmest
PubliekssamenvattingIn maart 2015 vond het achttiende EURL-ringonderzoek naar detectie van Salmonella plaats. Deelname aan deze kwaliteitstoets is verplicht voor alle Nationale Referentie Laboratoria (NRL's) van de Europese lidstaten die verantwoordelijk zijn voor het aantonen van Salmonella in dierlijke mest. Voor dit ringonderzoek is een ander type mest gebruikt, dat dit keer geen geschikt alternatief bleek. Daardoor waren de resultaten van de deelnemers niet onderling te vergelijken.
In totaal hebben 36 NRL's deelgenomen aan dit ringonderzoek: 29 NRL's afkomstig van 28 lidstaten in de EU, 6 NRL's afkomstig uit kandidaatlanden voor het EU-lidmaatschap of lidstaten van de European Free Trade Association (EFTA) status en 1 niet-Europees NRL op verzoek van de Europese Unie.
Er is varkensmest gebruikt omdat het vanwege de vogelgriep in de herfst van 2014 niet was toegestaan om kippenmest te transporteren. Varkensmest staat bekend als een geschikt alternatief. Wel moeten de monsters bij een lagere temperatuur (-20 °C in plaats van 5 of 10 °C) worden bewaard om te voorkomen dat er gisten en schimmels in gaan groeien. In de testfase bleek onder deze omstandigheden een gedeelte van de toegevoegde Salmonella dood te gaan. Door extra veel Salmonella toe te voegen, zouden er genoeg bacteriën in leven moeten blijven. Tijdens de analyses van de varkensmestmonsters door de laboratoria bleek echter dat Salmonella het invriezen niet goed had overleefd. De hoeveelheid Salmonella in de aangeleverde monsters verschilde daardoor per laboratorium, zodat de resultaten niet met elkaar konden worden vergeleken.
De laboratoria hebben de monsters geanalyseerd met behulp van de internationaal voorgeschreven analysemethode (MSRV). Het overkoepelend referentielaboratorium van de Europese Unie voor Salmonella (EURL-Salmonella) is gevestigd bij het RIVM.
In March 2015, the EURL-Salmonella organised the 18th interlaboratory comparison study on the detection of Salmonella in samples from the primary production stage. Participation was obligatory for all EU Member State NRLs that are responsible for the detection of Salmonella in samples from primary production. In total, 36 NRLs participated in this study: 29 NRLs from the 28 EU-Member States (MS), 6 NRLs from other countries in Europe (EU candidate MS or potential EU candidate MS and members of the European Free Trade Association (EFTA)) and, at the request of DG-Santé, one NRL from a non-European country. EURL-Salmonella is part of the Dutch National Institute for Public Health and the Environment (RIVM).
Due to the avian influenza outbreak in the Netherlands, it was not possible to transport chicken faeces. Therefore, the EURL chose pig faeces as an alternative matrix for this detection study. Pre-studies showed that pig faeces were susceptible to the growth of yeast and moulds during storage at 5 °C or 10 °C. Therefore, storage at -20 °C was tested as an alternative. Salmonella was found to be sensitive to freezing, but by using a higher starting inoculation levels, it was expected that Salmonella would still be found after freezing of the pig faeces.
Unfortunately, Salmonella survival in the frozen pig faeces samples was not stable. The results varied tremendously amongst the participants. Therefore, the performance of the participants could not be evaluated in this study.
Descriptionalleen digitaal verschenen
Directorate General for Health and Consumer Protection (DG-Sante)
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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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