• EU Interlaboratory comparison study food VII (2015) : Detection of Salmonella in whole liquid chicken egg

      Kuijpers AFA; Mooijman KA; VLD; I&V (Rijksinstituut voor Volksgezondheid en Milieu RIVM, 2017-05-30)
      In 2015, it was shown that all 36 National Reference Laboratories (NRLs) in the European Union were able to detect high and low levels of Salmonella in whole liquid chicken egg. One NRL reported positive results for two blank whole liquid egg samples, a possible explanation may be cross-contamination. In a follow-up study this laboratory scored all samples correctly and achieved the level of good performance. The laboratories detected Salmonella in all contaminated samples. In this report we present some of the conclusions of the 7th EU Interlaboratory Comparison Study of Food Samples, which was organised by the European Union Reference Laboratory for Salmonella (EURL-Salmonella). Interlaboratory comparison study obligatory for EU Member States The study was conducted in September 2015, with a follow-up study in January 2016. Participation was obligatory for all EU Member State NRLs that are responsible for the detection of Salmonella in food samples. EURL-Salmonella is part of the Dutch National Institute for Public Health and the Environment (RIVM). The laboratories used internationally accepted analysis methods to detect the presence of Salmonella in whole liquid chicken egg samples. Each laboratory received a package with whole liquid egg samples contaminated with two different concentrations of Salmonella Enteritidis 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. Preparation of samples In this study, for the first time, liquid egg samples were used that had been artificially contaminated with a diluted culture of Salmonella at the laboratory of EURL-Salmonella. The results showed that this method of contamination, which had been used and tested in earlier studies involving food matrices (meat), animal feed and products of the primary production stage, could also be used for whole liquid egg