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Hallanvuo S, Herranen M, Jaakkonen A, Nummela M, Ranta J, Botteldoorn N, De Zutter L, Fredriksson-Ahomaa M, Hertwig S, Johannessen GS, Ludewig M, Messelhäußer U, Sigvart-Mattila P, Thisted-Lambertz S, Thure T, Vatunen E. Validation of EN ISO method 10273 - Detection of pathogenic Yersinia enterocolitica in foods. Int J Food Microbiol 2019; 288:66-74. [PMID: 29395387 DOI: 10.1016/j.ijfoodmicro.2018.01.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Revised: 10/10/2017] [Accepted: 01/08/2018] [Indexed: 11/25/2022]
Abstract
EN ISO 10273 method for the detection of pathogenic Yersinia enterocolitica in foods was validated in the project Mandate M/381 funded by European Commission. A total of 14 laboratories from five European countries participated in the interlaboratory study (ILS) organized during 2013 and 2014. Before the ILS, the method was revised by an international group of experts and the performance of the revised method was assessed in an ILS study. The results are published as a part of the standard EN ISO 10273 revision. The study included three rounds with different sample types; raw milk, iceberg lettuce and minced meat, inoculated with a low and high level of pathogenic Y. enterocolitica strains representing major pathogenic bioserotypes 4/O:3 and 2/O:9. The homogeneity and stability of the samples were verified before dispatching them to the laboratories. The results demonstrated the method sensitivity of 96% in raw milk, 97% in minced meat, and 98% in lettuce at high inoculation level of pathogenic Y. enterocolitica. The specificity was 100% in raw milk, 96% in minced meat, and 98% in lettuce. The level of detection, LOD50, varied between study rounds, being 9.4 CFU/25 ml in raw milk, 9.9 CFU/25 g in minced meat and 63 CFU/25 g in lettuce samples. During the study, confirmation by using real-time PCR method ISO/TS 18867 together with pyrazinamidase testing was also validated, as alternative to conventional biochemical confirmation. When comparing different isolation steps used in the revised method during the study rounds, PSB enrichment and plating on CIN after alkaline (KOH) treatment showed the highest sensitivity (52-92%) in raw milk and minced meat samples. In lettuce samples, however, ITC with KOH treatment before plating on CIN showed higher sensitivity (64% at low level; 82% at high level) than plating on CIN from PSB with KOH treatment (44% at low level; 74% at high level). Statistical analysis of different isolation steps supported the use of two enrichment media, PSB and ITC, in the revised method. Recovery of pathogenic Y. enterocolitica on CIN was most efficient after KOH treatment and, based on the analysis, plating on CIN agar without KOH treatment could be left as optional procedure in the method.
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Affiliation(s)
- Saija Hallanvuo
- Food and Feed Microbiology Research Unit, Research and Laboratory Services Department, Finnish Food Safety Authority Evira, Mustialankatu 3, 00790, Helsinki, Finland.
| | - Mirkka Herranen
- Food and Feed Microbiology Research Unit, Research and Laboratory Services Department, Finnish Food Safety Authority Evira, Mustialankatu 3, 00790, Helsinki, Finland
| | - Anniina Jaakkonen
- Food and Feed Microbiology Research Unit, Research and Laboratory Services Department, Finnish Food Safety Authority Evira, Mustialankatu 3, 00790, Helsinki, Finland
| | - Maria Nummela
- Food and Feed Microbiology Research Unit, Research and Laboratory Services Department, Finnish Food Safety Authority Evira, Mustialankatu 3, 00790, Helsinki, Finland
| | - Jukka Ranta
- Risk Assessment Research Unit, Research and Laboratory Services Department, Finnish Food Safety Authority Evira, Mustialankatu 3, 00790 Helsinki, Finland
| | - Nadine Botteldoorn
- Service food pathogens, Institute of Public health, Juliette Wijtsmans street 14, 1050 Brussels, Belgium
| | - Lieven De Zutter
- Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Salisburylaan, 133, 9820 Merelbeke, Belgium
| | | | - Stefan Hertwig
- Federal Institute for Risk Assessment (BfR), Diedersdorfer Weg 1, 12277 Berlin, Germany
| | | | - Martina Ludewig
- Institute of Food Hygiene, Faculty of Veterinary Medicine, University of Leipzig, An den Tierkliniken 1, 04103 Leipzig, Germany
| | - Ute Messelhäußer
- Laboratory of food microbiology, Bavarian Health and Food Safety Authority, Veterinärstr. 2, 85764 Oberschleißheim, Germany
| | - Pia Sigvart-Mattila
- Water Protection Association of the River Kokemäki, Patamäenkatu 24, 33900 Tampere, Finland
| | | | - Tiina Thure
- Metropolilab Oy, Viikinkaari 4, 00790 Helsinki, Finland
| | - Elina Vatunen
- Finnish Customs Laboratory, Tekniikantie 13, 02150 Espoo, Finland
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Vanantwerpen G, Van Damme I, De Zutter L, Houf K. Within-batch prevalence and quantification of human pathogenic Yersinia enterocolitica and Y. pseudotuberculosis in tonsils of pigs at slaughter. Vet Microbiol 2014; 169:223-7. [PMID: 24472227 DOI: 10.1016/j.vetmic.2013.12.019] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 12/16/2013] [Accepted: 12/21/2013] [Indexed: 11/30/2022]
Abstract
Yersiniosis is a common bacterial zoonosis in Europe and healthy pigs are known to be the primary reservoir of human pathogenic Yersinia enterocolitica and Y. pseudotuberculosis. However, little information is available about the prevalence of these pathogens within pig batches at time of slaughter. The tonsils of 7047 fattening pigs, belonging to 100 farms, were aseptically collected immediately after evisceration in two Belgian slaughterhouses. The batch size varied between 70 and 930 pigs. On average, 70 pigs were sampled per batch. The tonsils were examined by direct plating on cefsulodin-irgasan-novobiocin (CIN) agar plates and the number of suspect Yersinia colonies was counted. Pathogenic Y. enterocolitica serotype O:3 were found in tonsils of 2009 pigs (28.5%), originating from 85 farms. The within-batch prevalence in positive farms ranged from 5.1 to 64.4%. The number of Y. enterocolitica in positive pigs varied between 2.01 and 5.98 log10 CFU g(-1) tonsil, with an average of 4.00 log10 CFU g(-1) tonsil. Y. pseudotuberculosis was found in seven farms, for which the within-batch prevalence varied from 2 to 10%. In five of these farms, both Y. enterocolitica and Y. pseudotuberculosis were simultaneously present. Human pathogenic Yersinia spp. are widespread in slaughter pig batches in Belgium as 87% of the tested batches were infected with these pathogens at the time of slaughter. The large variation of the prevalence between batches may lead to different levels of contamination of carcasses and risks for public health.
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Affiliation(s)
- Gerty Vanantwerpen
- Department Veterinary Public Health and Food Safety, Faculty Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820 Merelbeke, Belgium.
| | - Inge Van Damme
- Department Veterinary Public Health and Food Safety, Faculty Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820 Merelbeke, Belgium.
| | - Lieven De Zutter
- Department Veterinary Public Health and Food Safety, Faculty Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820 Merelbeke, Belgium.
| | - Kurt Houf
- Department Veterinary Public Health and Food Safety, Faculty Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820 Merelbeke, Belgium.
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Van Damme I, Berkvens D, Botteldoorn N, Dierick K, Wits J, Pochet B, De Zutter L. Evaluation of the ISO 10273:2003 method for the isolation of human pathogenic Yersinia enterocolitica from pig carcasses and minced meat. Food Microbiol 2013; 36:170-5. [DOI: 10.1016/j.fm.2013.05.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2012] [Revised: 04/22/2013] [Accepted: 05/22/2013] [Indexed: 10/26/2022]
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