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Boxman ILA, Molin R, Persson S, Juréus A, Jansen CCC, Sosef NP, Le Guyader SF, Ollivier J, Summa M, Hautaniemi M, Suffredini E, Di Pasquale S, Myrmel M, Khatri M, Jamnikar-Ciglenecki U, Kusar D, Moor D, Butticaz L, Lowther JA, Walker DI, Stapleton T, Simonsson M, Dirks RAM. An international inter-laboratory study to compare digital PCR with ISO standardized qPCR assays for the detection of norovirus GI and GII in oyster tissue. Food Microbiol 2024; 120:104478. [PMID: 38431324 DOI: 10.1016/j.fm.2024.104478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 01/10/2024] [Accepted: 01/10/2024] [Indexed: 03/05/2024]
Abstract
An optimized digital RT-PCR (RT-dPCR) assay for the detection of human norovirus GI and GII RNA was compared with ISO 15216-conform quantitative real-time RT-PCR (RT-qPCR) assays in an interlaboratory study (ILS) among eight laboratories. A duplex GI/GII RT-dPCR assay, based on the ISO 15216-oligonucleotides, was used on a Bio-Rad QX200 platform by six laboratories. Adapted assays for Qiagen Qiacuity or ThermoFisher QuantStudio 3D were used by one laboratory each. The ILS comprised quantification of norovirus RNA in the absence of matrix and in oyster tissue samples. On average, results of the RT-dPCR assays were very similar to those obtained by RT-qPCR assays. The coefficient of variation (CV%) of norovirus GI results was, however, much lower for RT-dPCR than for RT-qPCR in intra-laboratory replicates (eight runs) and between the eight laboratories. The CV% of norovirus GII results was in the same range for both detection formats. Had in-house prepared dsDNA standards been used, the CV% of norovirus GII could have been in favor of the RT-dPCR assay. The ratio between RT-dPCR and RT-qPCR results varied per laboratory, despite using the distributed RT-qPCR dsDNA standards. The study indicates that the RT-dPCR assay is likely to increase uniformity of quantitative results between laboratories.
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Affiliation(s)
- Ingeborg L A Boxman
- Wageningen Food Safety Research (WFSR), Wageningen University and Research, Wageningen, the Netherlands.
| | - Ramia Molin
- European Union Reference Laboratory for Foodborne Viruses, Swedish Food Agency, Uppsala, Sweden.
| | - Sofia Persson
- European Union Reference Laboratory for Foodborne Viruses, Swedish Food Agency, Uppsala, Sweden.
| | - Anna Juréus
- European Union Reference Laboratory for Foodborne Viruses, Swedish Food Agency, Uppsala, Sweden.
| | - Claudia C C Jansen
- Wageningen Food Safety Research (WFSR), Wageningen University and Research, Wageningen, the Netherlands.
| | - Nils P Sosef
- Wageningen Food Safety Research (WFSR), Wageningen University and Research, Wageningen, the Netherlands.
| | - Soizick F Le Guyader
- French Research Institute for Exploitation of the Sea (Ifremer) - Laboratoire de Santé, Environnement et Microbiologie, Nantes, France.
| | - Joanna Ollivier
- French Research Institute for Exploitation of the Sea (Ifremer) - Laboratoire de Santé, Environnement et Microbiologie, Nantes, France.
| | | | | | - Elisabetta Suffredini
- Istituto Superiore di Sanità, Department of Food Safety, Nutrition and Veterinary Public Health, Rome, Italy.
| | - Simona Di Pasquale
- Istituto Superiore di Sanità, Department of Food Safety, Nutrition and Veterinary Public Health, Rome, Italy.
| | - Mette Myrmel
- Norwegian University of Life Sciences (NMBU), Faculty of Veterinary Medicine, Virology Unit, Ås, Norway.
| | - Mamata Khatri
- Norwegian University of Life Sciences (NMBU), Faculty of Veterinary Medicine, Virology Unit, Ås, Norway.
| | - Urska Jamnikar-Ciglenecki
- University of Ljubljana Veterinary Faculty, Institute of Food Safety, Feed and Environment, Ljubljana, Slovenia.
| | - Darja Kusar
- University of Ljubljana Veterinary Faculty, Institute of Microbiology and Parasitology, Ljubljana, Slovenia.
| | - Dominik Moor
- Federal Institute of Metrology METAS, Biological Analysis and References Laboratory, Bern, Switzerland.
| | - Lisa Butticaz
- Federal Institute of Metrology METAS, Biological Analysis and References Laboratory, Bern, Switzerland.
| | - James A Lowther
- Centre for Environment, Fisheries and Aquaculture Science, Weymouth, United Kingdom.
| | - David I Walker
- Centre for Environment, Fisheries and Aquaculture Science, Weymouth, United Kingdom.
| | - Tina Stapleton
- Centre for Environment, Fisheries and Aquaculture Science, Weymouth, United Kingdom.
| | - Magnus Simonsson
- European Union Reference Laboratory for Foodborne Viruses, Swedish Food Agency, Uppsala, Sweden.
| | - René A M Dirks
- Wageningen Food Safety Research (WFSR), Wageningen University and Research, Wageningen, the Netherlands.
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Boxman ILA, Jansen CCC, Zwartkruis-Nahuis AJT, Hägele G, Sosef NP, Dirks RAM. Detection and quantification of hepatitis E virus RNA in ready to eat raw pork sausages in the Netherlands. Int J Food Microbiol 2020; 333:108791. [PMID: 32758861 DOI: 10.1016/j.ijfoodmicro.2020.108791] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Revised: 06/24/2020] [Accepted: 07/12/2020] [Indexed: 12/27/2022]
Abstract
The aim of the present study was to assess raw pork sausages collected on the Dutch market for the presence of hepatitis E virus (HEV) RNA. 46 of 316 (14.6%) products sampled from Dutch retail stores in 2017-2019 were positive for HEV RNA. HEV RNA was detected in 10.8% of "cervelaat" (n = 74), 18.5% of salami (n = 92), 26.1% of "metworst" (n = 46), 16.3% of "snijworst" (n = 43) samples. This was significantly more often than in other raw pork sausages like dried sausages, fuet or chorizo (3.3%, n = 61). The percentage of HEV RNA positive products was not significantly different for products sold as either sliced or unsliced deli meat. The average viral load in positive tested products was 2.76 log10 genome copies per 5 g, incidentally reaching up to 4.5 log10 genome copies per 5 g. The average HEV RNA level was significantly higher in samples collected in 2017 than those in samples collected in 2018, and most of the samples in 2019. Typing by sequence analysis was successful for 33 samples, all revealing genotype 3c. The results support recent epidemiological studies that identified specific raw pork sausages as risk factor for hepatitis E virus infection in the Netherlands. Persons at risk, including Dutch transplant recipients, have been advised to avoid the consumption of raw pork sausages. The study warrants a continuation of monitoring to follow the HEV RNA levels in pork products for use in risk assessments and risk management.
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Affiliation(s)
- Ingeborg L A Boxman
- Wageningen Food Safety Research, Wageningen University and Research, Mailbox 230, 6700 AE Wageningen, the Netherlands.
| | - Claudia C C Jansen
- Wageningen Food Safety Research, Wageningen University and Research, Mailbox 230, 6700 AE Wageningen, the Netherlands
| | - Ans J T Zwartkruis-Nahuis
- Wageningen Food Safety Research, Wageningen University and Research, Mailbox 230, 6700 AE Wageningen, the Netherlands
| | - Geke Hägele
- Wageningen Food Safety Research, Wageningen University and Research, Mailbox 230, 6700 AE Wageningen, the Netherlands
| | - Nils P Sosef
- Wageningen Food Safety Research, Wageningen University and Research, Mailbox 230, 6700 AE Wageningen, the Netherlands
| | - René A M Dirks
- Wageningen Food Safety Research, Wageningen University and Research, Mailbox 230, 6700 AE Wageningen, the Netherlands
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