Monitoring by a Sensitive Liquid-Based Sampling Strategy Reveals a Considerable Reduction of <i>Listeria monocytogenes</i> in Smeared Cheese Production over 10 Years of Testing in Austria
Most Austrian dairies and cheese manufacturers participated in a <i>Listeria</i> monitoring program, which was established after the first reports of dairy product-associated listeriosis outbreaks more than thirty years ago. Within the <i>Listeria</i> monitoring program, up t...
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| Format: | Article |
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MDPI AG
2021-08-01
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| Series: | Foods |
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| Online Access: | https://www.mdpi.com/2304-8158/10/9/1977 |
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| author | Peter Zangerl Dagmar Schoder Frieda Eliskases-Lechner Abdoulla Zangana Elisabeth Frohner Beatrix Stessl Martin Wagner |
| author_facet | Peter Zangerl Dagmar Schoder Frieda Eliskases-Lechner Abdoulla Zangana Elisabeth Frohner Beatrix Stessl Martin Wagner |
| author_sort | Peter Zangerl |
| collection | DOAJ |
| description | Most Austrian dairies and cheese manufacturers participated in a <i>Listeria</i> monitoring program, which was established after the first reports of dairy product-associated listeriosis outbreaks more than thirty years ago. Within the <i>Listeria</i> monitoring program, up to 800 mL of product-associated liquids such as cheese smear or brine are processed in a semi-quantitative approach to increase epidemiological sensitivity. A sampling strategy within cheese production, which detects environmental contamination before it results in problematic food contamination, has benefits for food safety management. The liquid-based sampling strategy was implemented by both industrial cheese makers and small-scale dairies located in the mountainous region of Western Austria. This report considers more than 12,000 <i>Listeria</i> spp. examinations of liquid-based samples in the 2009 to 2018 timeframe. Overall, the occurrence of L. monocytogenes in smear liquid samples was 1.29% and 1.55% (<i>n</i> = 5043 and <i>n</i> = 7194 tested samples) for small and industrial cheese enterprises, respectively. The liquid-based sampling strategy for Listeria monitoring at the plant level appears to be superior to solid surface monitoring. Cheese smear liquids seem to have good utility as an index of the contamination of cheese up to that point in production. A modelling or validation process should be performed for the new semi-quantitative approach to estimate the true impact of the method in terms of reducing Listeria contamination at the cheese plant level. |
| first_indexed | 2024-03-10T07:41:08Z |
| format | Article |
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| institution | Directory Open Access Journal |
| issn | 2304-8158 |
| language | English |
| last_indexed | 2024-03-10T07:41:08Z |
| publishDate | 2021-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Foods |
| spelling | doaj.art-f1903881ff8640faad0c0128787fcfcd2023-11-22T13:02:18ZengMDPI AGFoods2304-81582021-08-01109197710.3390/foods10091977Monitoring by a Sensitive Liquid-Based Sampling Strategy Reveals a Considerable Reduction of <i>Listeria monocytogenes</i> in Smeared Cheese Production over 10 Years of Testing in AustriaPeter Zangerl0Dagmar Schoder1Frieda Eliskases-Lechner2Abdoulla Zangana3Elisabeth Frohner4Beatrix Stessl5Martin Wagner6Higher Federal Teaching and Research Institute in Tyrol for Agriculture and Nutrition as well as Food and Biotechnology, Rotholz 50, 6200 Strass im Zillertal, AustriaUnit of Food Microbiology, Institute of Food Safety, Food Technology and Veterinary Public Health, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna, Veterinärplatz 1, 1210 Vienna, AustriaHigher Federal Teaching and Research Institute in Tyrol for Agriculture and Nutrition as well as Food and Biotechnology, Rotholz 50, 6200 Strass im Zillertal, AustriaUnit of Food Microbiology, Institute of Food Safety, Food Technology and Veterinary Public Health, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna, Veterinärplatz 1, 1210 Vienna, AustriaUnit of Food Microbiology, Institute of Food Safety, Food Technology and Veterinary Public Health, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna, Veterinärplatz 1, 1210 Vienna, AustriaUnit of Food Microbiology, Institute of Food Safety, Food Technology and Veterinary Public Health, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna, Veterinärplatz 1, 1210 Vienna, AustriaUnit of Food Microbiology, Institute of Food Safety, Food Technology and Veterinary Public Health, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna, Veterinärplatz 1, 1210 Vienna, AustriaMost Austrian dairies and cheese manufacturers participated in a <i>Listeria</i> monitoring program, which was established after the first reports of dairy product-associated listeriosis outbreaks more than thirty years ago. Within the <i>Listeria</i> monitoring program, up to 800 mL of product-associated liquids such as cheese smear or brine are processed in a semi-quantitative approach to increase epidemiological sensitivity. A sampling strategy within cheese production, which detects environmental contamination before it results in problematic food contamination, has benefits for food safety management. The liquid-based sampling strategy was implemented by both industrial cheese makers and small-scale dairies located in the mountainous region of Western Austria. This report considers more than 12,000 <i>Listeria</i> spp. examinations of liquid-based samples in the 2009 to 2018 timeframe. Overall, the occurrence of L. monocytogenes in smear liquid samples was 1.29% and 1.55% (<i>n</i> = 5043 and <i>n</i> = 7194 tested samples) for small and industrial cheese enterprises, respectively. The liquid-based sampling strategy for Listeria monitoring at the plant level appears to be superior to solid surface monitoring. Cheese smear liquids seem to have good utility as an index of the contamination of cheese up to that point in production. A modelling or validation process should be performed for the new semi-quantitative approach to estimate the true impact of the method in terms of reducing Listeria contamination at the cheese plant level.https://www.mdpi.com/2304-8158/10/9/1977<i>Listeria</i> spp.<i>Listeria monocytogenes</i>prevalencedetectionmonitoringsmear |
| spellingShingle | Peter Zangerl Dagmar Schoder Frieda Eliskases-Lechner Abdoulla Zangana Elisabeth Frohner Beatrix Stessl Martin Wagner Monitoring by a Sensitive Liquid-Based Sampling Strategy Reveals a Considerable Reduction of <i>Listeria monocytogenes</i> in Smeared Cheese Production over 10 Years of Testing in Austria Foods <i>Listeria</i> spp. <i>Listeria monocytogenes</i> prevalence detection monitoring smear |
| title | Monitoring by a Sensitive Liquid-Based Sampling Strategy Reveals a Considerable Reduction of <i>Listeria monocytogenes</i> in Smeared Cheese Production over 10 Years of Testing in Austria |
| title_full | Monitoring by a Sensitive Liquid-Based Sampling Strategy Reveals a Considerable Reduction of <i>Listeria monocytogenes</i> in Smeared Cheese Production over 10 Years of Testing in Austria |
| title_fullStr | Monitoring by a Sensitive Liquid-Based Sampling Strategy Reveals a Considerable Reduction of <i>Listeria monocytogenes</i> in Smeared Cheese Production over 10 Years of Testing in Austria |
| title_full_unstemmed | Monitoring by a Sensitive Liquid-Based Sampling Strategy Reveals a Considerable Reduction of <i>Listeria monocytogenes</i> in Smeared Cheese Production over 10 Years of Testing in Austria |
| title_short | Monitoring by a Sensitive Liquid-Based Sampling Strategy Reveals a Considerable Reduction of <i>Listeria monocytogenes</i> in Smeared Cheese Production over 10 Years of Testing in Austria |
| title_sort | monitoring by a sensitive liquid based sampling strategy reveals a considerable reduction of i listeria monocytogenes i in smeared cheese production over 10 years of testing in austria |
| topic | <i>Listeria</i> spp. <i>Listeria monocytogenes</i> prevalence detection monitoring smear |
| url | https://www.mdpi.com/2304-8158/10/9/1977 |
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