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de Klerk JN, Robinson PA. Drivers and hazards of consumption of unpasteurised bovine milk and milk products in high-income countries. PeerJ 2022; 10:e13426. [PMID: 35646485 PMCID: PMC9135038 DOI: 10.7717/peerj.13426] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 04/21/2022] [Indexed: 01/14/2023] Open
Abstract
Introduction The consumption of dairy products contributes to health, nutrition, and livelihoods globally. However, dairy products do not come without microbiological food safety risks for consumers. Despite this risk, common hygiene measures in high-income countries, particularly pasteurisation, ensures that milk is safe, and is indeed frequently mandated by law. Nevertheless, over the past two decades, there has been a global increase in the number of consumers in high-income developed countries actively seeking out unpasteurised milk in liquid and product forms for perceived nutritional and health benefits, and improved taste. The often-anecdotal claims upon which consumers make such choices are not all supported by scientific evidence; however, some recent research studies have investigated (and in some cases demonstrated) the positive impact of unpasteurised milk consumption on the prevalence of asthma, atopy, rectal cancer and respiratory illness. Methods To investigate the significance of unpasteurised milk and milk product consumption for human health in high-income countries, outbreak data between the years 2000 and 2018 were obtained for the United States of America, Canada, the European Union, the United Kingdom, Japan, New Zealand and Australia, which were then categorized into three World Health Organisation subregions: AMR A, EUR A and WPR A. Outbreak dynamic variables such as pathogens, the place of consumption, numbers of outbreaks and deaths per million capita, the average number of cases per outbreak and regulations were described and analysed using R Studio. To provide an overview of unpasteurised milk-related disease outbreaks, a rapid evidence review was also undertaken to establish an overview of what is known in the current literature about hazards and drivers of consumption. Results Foodborne outbreaks associated with unpasteurised dairy consumption have risen in high-income countries over the period 2000 to 2018, with Campylobacter spp. being the most common aetiological agent responsible, followed by Escherichia coli and Salmonella spp. The most common places of consumption are on farms or in households, indicating individuals choose to drink unpasteurised milk, rather than a widespread distribution of the product, for example, at social events and in schools. Further study is needed to better understand contributing factors, such as cultural differences in the consumption of dairy products. Conclusion There are several observable health benefits linked to consuming raw milk, but outbreaks associated with unpasteurised milk and milk products are on the rise. It cannot be definitively concluded whether the benefits outweigh the risks, and ultimately the decision lies with the individual consumer. Nevertheless, many countries have regulations in place to protect consumer health, acknowledging the definite risks to human health that unpasteurised dairy foods may pose, particularly from microbial hazards.
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Affiliation(s)
- Joanna N. de Klerk
- School of Life Sciences, University of Warwick, Coventry, United Kingdom
| | - Philip A. Robinson
- Department of Animal Health, Behaviour and Welfare, Harper Adams University, Newport, Shropshire, United Kingdom
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Taghizadeh M, Nematollahi A, Bashiry M, Javanmardi F, Mousavil M, Hosseini H. The global prevalence of Campylobacter spp. in milk A systematic review and meta-analysis. Int Dairy J 2022. [DOI: 10.1016/j.idairyj.2022.105423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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3
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Willis C, McLAUCHLIN J, Aird H, Jørgensen F, Lai S, Sadler-Reeves L. Assessment of the Microbiological Quality and Safety of Unpasteurized Milk Cheese for Sale in England between 2019 and 2020. J Food Prot 2022; 85:278-286. [PMID: 34669925 DOI: 10.4315/jfp-21-247] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Accepted: 10/18/2021] [Indexed: 11/11/2022]
Abstract
ABSTRACT Cheese made with unpasteurized milk has been associated with outbreaks of illness. However, there are limited data on the prevalence of Shiga toxin-producing Escherichia coli (STEC) in these products and a lack of clarity over the significance of E. coli as a general indicator of hygiene in raw milk cheeses. The aim of this study was to provide further data to address both of these issues, as well as assessing the overall microbiological quality of raw milk cheeses available to consumers in England. A total of 629 samples of cheese were collected from retailers, catering premises, and manufacturers throughout England. The majority (80%) were made using cow's milk, with 14% made from sheep's milk and 5% from goat's milk. Samples were from 18 different countries of origin, with the majority originating from either the United Kingdom (40%) or France (35%). When interpreted against European Union microbiological criteria and United Kingdom guidance, 82% were considered to be of satisfactory microbiological quality, 5% were borderline, and 12% were unsatisfactory. Four samples (0.6%) were potentially injurious to health due to the isolation of STEC from one, >104 CFU/g of coagulase-positive staphylococci in two, and >100 CFU/g of Listeria monocytogenes in the fourth sample. Indicator E. coli and Listeria species were detected more frequently in soft compared with hard cheese. Higher levels of indicator E. coli were significantly associated with a greater likelihood of detecting Shiga toxin genes (stx1 and/or stx2). HIGHLIGHTS
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Affiliation(s)
- C Willis
- UK Health Security Agency, Food Water and Environmental Microbiology Laboratory Porton, Manor Farm Road, Porton Down, Salisbury, UK SP4 0JG
| | - J McLAUCHLIN
- UK Health Security Agency, Food Water and Environmental Microbiology Services, Colindale Avenue, Colindale, London, UK NW9 5EQ
| | - H Aird
- UK Health Security Agency, Food Water and Environmental Microbiology Laboratory York, National Agri-Food Innovation Campus, Sand Hutton, York, UK YO41 1LZ
| | - F Jørgensen
- UK Health Security Agency, Food Water and Environmental Microbiology Laboratory Porton, Manor Farm Road, Porton Down, Salisbury, UK SP4 0JG
| | - S Lai
- UK Health Security Agency, Food Water and Environmental Microbiology Services, Colindale Avenue, Colindale, London, UK NW9 5EQ
| | - L Sadler-Reeves
- UK Health Security Agency, Field Services, South East, Level 2, Civic Centre, Tannery Lane, Ashford, UK TN23 1PL
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Nourishing the Human Holobiont to Reduce the Risk of Non-Communicable Diseases: A Cow’s Milk Evidence Map Example. Appl Microbiol 2021. [DOI: 10.3390/applmicrobiol2010003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The microbiome revolution brought the realization that diet, health, and safety for humans in reality means diet, health, and safety for the human holobiont/superorganism. Eating healthier means much more than just feeding human cells. Our diet must also nourish the combination of our microbiome and our connected physiological systems (e.g., the microimmunosome). For this reason, there has been an interest in returning to ancestral “complete” unprocessed foods enriched in microbes, including raw milks. To contribute to this inevitable “nourishing the holobiont” trend, we introduce a systematic risk–benefit analysis tool (evidence mapping), which facilitates transdisciplinary state-of-the-science decisions that transcend single scientific disciplines. Our prior paper developed an evidence map (a type of risk–benefit mind map) for raw vs. processed/pasteurized human breast milk. In the present paper, we follow with a comprehensive evidence map and narrative for raw/natural vs. processed/pasteurized cow’s milk. Importantly, the evidence maps incorporate clinical data for both infectious and non-communicable diseases and allow the impact of modern agricultural, food management, and medical and veterinary monitoring outcomes to be captured. Additionally, we focus on the impact of raw milks (as “complete” foods) on the microimmunosome, the microbiome-systems biology unit that significantly determines risk of the world’s number one cause of human death, non-communicable diseases.
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Ryu S, Park WS, Yun B, Shin M, Go GW, Kim JN, Oh S, Kim Y. Diversity and characteristics of raw milk microbiota from Korean dairy farms using metagenomic and culturomic analysis. Food Control 2021. [DOI: 10.1016/j.foodcont.2021.108160] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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6
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Mahgoub S, Alagawany M, Nader M, Omar SM, Abd El-Hack ME, Swelum A, Elnesr SS, Khafaga AF, Taha AE, Farag MR, Tiwari R, Marappan G, El-Sayed AS, Patel SK, Pathak M, Michalak I, Al-Ghamdi ES, Dhama K. Recent Development in Bioactive Peptides from Plant and Animal Products and Their Impact on the Human Health. FOOD REVIEWS INTERNATIONAL 2021. [DOI: 10.1080/87559129.2021.1923027] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Samir Mahgoub
- Department of Agricultural Microbiology, Faculty of Agriculture, Zagazig University, Zagazig, Egypt
| | - Mahmoud Alagawany
- Poultry Department, Faculty of Agriculture, Zagazig University, Zagazig Egypt
| | - Maha Nader
- Department of Agricultural Microbiology, Faculty of Agriculture, Zagazig University, Zagazig, Egypt
| | - Safaa M. Omar
- Department of Agricultural Microbiology, Faculty of Agriculture, Zagazig University, Zagazig, Egypt
| | | | - Ayman Swelum
- Department of Theriogenology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
| | - Shaaban S. Elnesr
- Department of Poultry Production, Faculty of Agriculture, Fayoum University, Fayoum, Egypt
| | - Asmaa F. Khafaga
- Department of Pathology, Faculty of Veterinary Medicine, Alexandria University, Edfina’ Egypt
| | - Ayman E. Taha
- Department of Animal Husbandry and Animal Wealth Development, Faculty of Veterinary Medicine, Alexandria University, Edfina’ Egypt
| | - Mayada R. Farag
- Forensic Medicine and Toxicology Department, Faculty of Veterinary Medicine, Zagazig University, Zagazig’ Egypt
| | - Ruchi Tiwari
- Department of Veterinary Microbiology and Immunology, College of Veterinary Sciences, Up Pandit Deen Dayal Upadhayay Pashu Chikitsa Vigyan Vishwavidyalay Evum Go-Anusandhan Sansthan (DUVASU), Mathura, Uttar Pradesh, India
| | - Gopi Marappan
- Division of Avian Physiology and Reproduction, ICAR-Central Avian Research Institute, Izatnagar, Bareilly, Uttar Pradesh, India
| | - Ashraf S. El-Sayed
- Botany and Microbiology Department, Faculty of Science, Zagazig University, Zagazig, Egypt
| | - Shailesh K. Patel
- Division of Pathology, ICAR-Indian Veterinary Research Institute Izatnagar, Bareilly- Uttar Pradesh, India
| | - Mamta Pathak
- Division of Pathology, ICAR-Indian Veterinary Research Institute Izatnagar, Bareilly- Uttar Pradesh, India
| | - Izabela Michalak
- Department of Advanced Material Technologies,Faculty of Chemistry, Wrocław University of Science and Technology, Wrocław’, Poland
| | - Etab S. Al-Ghamdi
- Department of Food and Nutrition, College of Human Sciences and Design, King Abdualziz University, Jeddah, Saudi Arabia
| | - Kuldeep Dhama
- Division of Pathology, ICAR-Indian Veterinary Research Institute Izatnagar, Bareilly- Uttar Pradesh, India
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Clawin‐Rädecker I, De Block J, Egger L, Willis C, Da Silva Felicio MT, Messens W. The use of alkaline phosphatase and possible alternative testing to verify pasteurisation of raw milk, colostrum, dairy and colostrum-based products. EFSA J 2021; 19:e06576. [PMID: 33968255 PMCID: PMC8085980 DOI: 10.2903/j.efsa.2021.6576] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Pasteurisation of raw milk, colostrum, dairy or colostrum-based products must be achieved using at least 72°C for 15 s, at least 63°C for 30 min or any equivalent combination, such that the alkaline phosphatase (ALP) test immediately after such treatment gives a negative result. For cows' milk, a negative result is when the measured activity is ≤ 350 milliunits of enzyme activity per litre (mU/L) using the ISO standard 11816-1. The use and limitations of an ALP test and possible alternative methods for verifying pasteurisation of those products from other animal species (in particular sheep and goats) were evaluated. The current limitations of ALP testing of bovine products also apply. ALP activity in raw ovine milk appears to be about three times higher and in caprine milk about five times lower than in bovine milk and is highly variable between breeds. It is influenced by season, lactation stage and fat content. Assuming a similar pathogen inactivation rate to cows' milk and based on the available data, there is 95-99% probability (extremely likely) that pasteurised goat milk and pasteurised sheep milk would have an ALP activity below a limit of 300 and 500 mU/L, respectively. The main alternative methods currently used are temperature monitoring using data loggers (which cannot detect other process failures such as cracked or leaking plates) and the enumeration of Enterobacteriaceae (which is not suitable for pasteurisation verification but is relevant for hygiene monitoring). The inactivation of certain enzymes other than ALP may be more suitable for the verification of pasteurisation but requires further study. Secondary products of heat treatment are not suitable as pasteurisation markers due to the high temperatures needed for their production. More research is needed to facilitate a definitive conclusion on the applicability of changes in native whey proteins as pasteurisation markers.
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9
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McLauchlin J, Aird H, Charlett A, Elviss N, Jorgensen F, Willis C. Microbiological Quality of Cooked Chicken: Results of Monitoring in England (2013-17). J Food Prot 2020; 83:1989-1997. [PMID: 32634224 DOI: 10.4315/jfp-20-187] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 07/05/2020] [Accepted: 07/06/2020] [Indexed: 11/11/2022]
Abstract
Results from monitoring of the microbiological quality of 2,721 samples of ready-to-eat cooked chicken collected between 2013 to 2017 in England were reviewed: 70% of samples were from retail, catering or manufacture and 30% were imported and collected at English ports. Samples were tested for a range of bacterial pathogens and indicator organisms. Six samples (<1%) had unsatisfactory levels of pathogens which were potentially injurious to health. Neither Salmonella nor Campylobacter were recovered from any sample. Two samples from catering settings contained either an unsatisfactory level of Bacillus cereus (5 x 10 6 CFU/g) or an unsatisfactory level of coagulase positive staphylococci (1.6 x 10 4 CFU/g). Listeria monocytogenes was recovered from 36 samples (one at manufacture, 26 at catering and nine at retail) and in four instances, unsatisfactory levels (≥10 2 CFU/g) were detected (three samples collected at catering and one at retail). For L. monocytogenes there were no significant differences between the rates of contamination with between the samples collected from ports, manufacture, retail supermarkets and other retailers (p = 0.288). There were no differences between the rates of contamination for other potential pathogens detected between samples from different settings. The prevalence of hygiene indicators ( Escherichia coli , Enterobacteriaceae and Aerobic Colony Counts) at import was significantly lower than in samples collected from manufacturers, retail or catering (p < 0.01). Samples collected from catering gave poorer results than all other settings. Regardless of the stage in the food chain, samples from Thailand and from other non-EU countries were of significantly better microbiological quality with respect to indicator organisms than those from the UK or from other EU countries (p = <0.001).
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Affiliation(s)
- Jim McLauchlin
- Public Health England Colindale 61 Colindale Ave UNITED KINGDOM London NW9 5HT
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10
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Almeida TTD, Andretta M, Ferreira LR, Carvalho AFD, Nero LA. The complex microbiota of artisanal cheeses interferes in the performance of enumeration protocols for lactic acid bacteria and staphylococci. Int Dairy J 2020. [DOI: 10.1016/j.idairyj.2020.104791] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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11
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O'Grady J, Cronin U, Tierney J, Piterina AV, O'Meara E, Wilkinson MG. Gaps in the assortment of rapid assays for microorganisms of interest to the dairy industry. ADVANCES IN APPLIED MICROBIOLOGY 2020; 113:1-56. [PMID: 32948264 PMCID: PMC7426214 DOI: 10.1016/bs.aambs.2020.07.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
This review presents the results of a study into the offering of rapid microbial detection assays to the Irish dairy industry. At the outset, a consultation process was undertaken whereby key stakeholders were asked to compile a list of the key microorganisms of interest to the sector. The resultant list comprises 19 organisms/groups of organisms divided into five categories: single pathogenic species (Cronobacter sakazakii, Escherichia coli and Listeria monocytogenes); genera containing pathogenic species (Bacillus, Clostridium, Listeria, Salmonella; Staphylococcus); broad taxonomic groupings (Coliforms, Enterobacteriaceae, fecal Streptococci, sulfite reducing bacteria/sulfite reducing Clostridia [SRBs/SRCs], yeasts and molds); organisms displaying certain growth preferences or resistance as regards temperature (endospores, psychrotrophs, thermodurics, thermophiles); indicators of quality (total plate count, Pseudomonas spp.). A survey of the rapid assays commercially available for the 19 organisms/groups of organisms was conducted. A wide disparity between the number of rapid tests available was found. Four categories were used to summarize the availability of rapid assays per organism/group of organisms: high coverage (>15 assays available); medium coverage (5-15 assays available); low coverage (<5 assays available); no coverage (0 assays available). Generally, species or genera containing pathogens, whose presence is regulated-for, tend to have a good selection of commercially available rapid assays for their detection, whereas groups composed of heterogenous or even undefined genera of mainly spoilage organisms tend to be "low coverage" or "no coverage." Organisms/groups of organisms with "low coverage" by rapid assays include: Clostridium spp.; fecal Streptococci; and Pseudomonas spp. Those with "no coverage" by rapid assays include: endospores; psychrotrophs; SRB/SRCs; thermodurics; and thermophiles. An important question is: why have manufacturers of rapid microbiological assays failed to respond to the necessity for rapid methods for these organisms/groups of organisms? The review offers explanations, ranging from the technical difficulty involved in detecting as broad a group as the thermodurics, which covers the spores of multiple sporeforming genera as well at least six genera of mesophilic nonsporeformers, to the taxonomically controversial issue as to what constitutes a fecal Streptococcus or SRBs/SRCs. We review two problematic areas for assay developers: validation/certification and the nature of dairy food matrices. Development and implementation of rapid alternative test methods for the dairy industry is influenced by regulations relating to both the microbiological quality standards and the criteria alternative methods must meet to qualify as acceptable test methods. However, the gap between the certification of developer's test systems as valid alternative methods in only a handful of representative matrices, and the requirement of dairy industries to verify the performance of alternative test systems in an extensive and diverse range of dairy matrices needs to be bridged before alternative methods can be widely accepted and adopted in the dairy industry. This study concludes that many important dairy matrices have effectively been ignored by assay developers.
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Affiliation(s)
- John O'Grady
- Dairy Processing Technology Centre, University of Limerick, Limerick, Ireland
| | - Ultan Cronin
- Department of Biological Sciences, University of Limerick, Limerick, Ireland.
| | - Joseph Tierney
- Glanbia Ingredients Ireland, Ballyragget, Co. Kilkenny, Ireland
| | - Anna V Piterina
- Dairy Processing Technology Centre, University of Limerick, Limerick, Ireland
| | - Elaine O'Meara
- Department of Biological Sciences, University of Limerick, Limerick, Ireland
| | - Martin G Wilkinson
- Department of Biological Sciences, University of Limerick, Limerick, Ireland
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Kingsbury JM, Soboleva TK. Evaluation of culture-based and molecular detection methods for Campylobacter in New Zealand raw cows' milk. J Appl Microbiol 2020; 130:478-492. [PMID: 32725959 DOI: 10.1111/jam.14798] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 07/21/2020] [Accepted: 07/22/2020] [Indexed: 01/23/2023]
Abstract
AIMS This study evaluated the performance of a commercial molecular detection method (mericon Campylobacter triple kit real-time/quantitative (q)PCR) and a selective plating medium (R&F Campylobacter jejuni/Campylobacter coli Chromogenic Plating Medium (CCPM)) against a culture-based reference method (ISO 10272-1:2017 detection procedure B) for the detection of Campylobacter from raw milk enrichment broths. METHODS AND RESULTS New Zealand raw cows' milk and Ultra-High Temperature-processed milk samples were inoculated with 50, 125 and 500 colony forming units of C. jejuni and C. coli cocktail per analytical unit. Samples were tested for Campylobacter after 0, 24- and 48 h refrigeration. ISO 10272-1:2017 proved to be a sensitive detection method (77/80 positive samples); detection only failed for some milk samples tested 48 h postinoculation. CCPM was as effective as Cefoperazone Charcoal Deoxycholate Agar for selective plating of Campylobacter raw milk enrichments (78/80 positive samples). However, the qPCR detected Campylobacter in only 42/80 samples and qPCR reaction inhibition was observed. CONCLUSIONS The ISO 10272-1:2017 method was a more sensitive method for Campylobacter detection from raw milk than the mericon Campylobacter triple kit qPCR, and CCPM was a useful complementary medium to mCCDA where one of these media is required by the standard. SIGNIFICANCE AND IMPACT OF THE STUDY In regions where testing is required or recommended, optimized methods for Campylobacter detection from raw milk will reduce risk to the raw milk consumer. Although molecular methods are generally touted as a rapid alternative to culture, issues with inhibition due to matrix components mean that culture-based methods might provide the most sensitive option for Campylobacter detection in raw milk. Findings also emphasize the importance of minimizing the time between milk collection and testing for Campylobacter.
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Affiliation(s)
- J M Kingsbury
- Institute of Environmental Science and Research, Christchurch, New Zealand
| | - T K Soboleva
- New Zealand Food Safety, Ministry for Primary Industries, Wellington, New Zealand
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van den Brom R, de Jong A, van Engelen E, Heuvelink A, Vellema P. Zoonotic risks of pathogens from sheep and their milk borne transmission. Small Rumin Res 2020; 189:106123. [PMID: 32427176 PMCID: PMC7227596 DOI: 10.1016/j.smallrumres.2020.106123] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 04/23/2020] [Accepted: 04/23/2020] [Indexed: 02/07/2023]
Abstract
Sheep were domesticated around 9000 BC in the Middle East, and since then milk from sheep gradually became very popular, not only for drinking but also for making cheeses and other dairy products. Nowadays, these dairy products are also important for people with an allergy to cow milk, and these products are an essential part of the local daily diet in regions of the world that are not suitable for cows and goats. Consumption of raw milk and raw milk products has a zoonotic risk, and with regard to sheep, the main pathogens associated with such dairy products are: Brucella melitensis, Campylobacter spp., Listeria spp., Salmonella spp., Shiga-toxin producing Escherichia coli, Staphylococcus aureus, tick borne encephalitis virus, and Toxoplasma gondii. Especially, young children, elderly people, pregnant women and immunocompromised (YOPI) persons, and those suffering from disease should be aware of the risk of consuming raw milk and raw milk products. This latter risk can be reduced by proper flock health management, prevention of contamination during milking, adequate milk processing, transport, and refrigerated storage. Only processes equaling pasteurization sufficiently reduce zoonotic risks from milk and milk products, but proper cooling is essential and recontamination must be prevented. Therefore, strict hygiene practices throughout the production process and supply chain especially for raw milk and raw dairy products, should be applied. Small scale production systems pose a greater risk compared to industrialized production systems because of a less protocolized and controlled production process. This manuscript describes zoonotic risks of pathogens from sheep and their milk borne transmission. Additionally, routes of contamination, possibilities for multiplication, and prevention measures thereof are described. We summarize some major human outbreaks caused by consumption of sheep milk and products made thereof, and finally discuss their implications.
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Affiliation(s)
- René van den Brom
- Royal GD, Department of Small Ruminant Health, Deventer, The Netherlands
| | - Aarieke de Jong
- Netherlands Food and Consumer Product Safety Authority, Office for Risk Assessment and Research (NVWA-BuRO), Utrecht, The Netherlands
| | - Erik van Engelen
- Royal GD, Department of Research and Development, Deventer, The Netherlands
| | - Annet Heuvelink
- Royal GD, Department of Research and Development, Deventer, The Netherlands
| | - Piet Vellema
- Royal GD, Department of Small Ruminant Health, Deventer, The Netherlands
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Breitenwieser F, Doll EV, Clavel T, Scherer S, Wenning M. Complementary Use of Cultivation and High-Throughput Amplicon Sequencing Reveals High Biodiversity Within Raw Milk Microbiota. Front Microbiol 2020; 11:1557. [PMID: 32742267 PMCID: PMC7365021 DOI: 10.3389/fmicb.2020.01557] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 06/16/2020] [Indexed: 12/16/2022] Open
Abstract
Raw milk microbiota are complex communities with a significant impact on the hygienic, sensory and technological quality of milk products. However, there is a lack of knowledge on factors determining their composition. In the present study, four bulk tank milk samples of two farms at two different time points were analyzed in detail for their microbiota using cultivation and 16S rRNA amplicon sequencing. Diversity in samples from the first time point was assessed via cultivation of 500 aerobic mesophilic bacterial isolates in each sample. A high biodiversity of 70 and 110 species per sample was determined, of which 25–28% corresponded to yet unknown taxa. The isolates were dominated by Gram-positive members of the genera Staphylococcus, Corynebacterium, Streptococcus, or Janibacter, whilst Chryseobacterium and Acinetobacter were most abundant among the Gram-negative taxa. At the second time point, samples of the same farms were analyzed via both cultivation (1,500 individual colonies each) and high-throughput 16S rRNA gene amplicon sequencing. The latter revealed a threefold higher biodiversity at the genus level, as anaerobic or fastidious species were also detected. However, cultivation identified genera not captured by sequencing, indicating that both approaches are complementary. Using amplicon sequencing, the relative abundance of a few genera was distorted, which seems to be an artifact of sample preparation. Therefore, attention needs to be paid to the library preparation procedure with special emphasis on cell lysis and PCR.
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Affiliation(s)
| | - Etienne V Doll
- Chair for Microbial Ecology, Weihenstephan School of Life Sciences, Technische Universität München, Freising, Germany
| | - Thomas Clavel
- Functional Microbiome Research Group, Institute of Medical Microbiology, RWTH University Hospital, Aachen, Germany.,ZIEL - Institute for Food and Health, Technische Universität München, Freising, Germany
| | - Siegfried Scherer
- Chair for Microbial Ecology, Weihenstephan School of Life Sciences, Technische Universität München, Freising, Germany.,ZIEL - Institute for Food and Health, Technische Universität München, Freising, Germany
| | - Mareike Wenning
- Chair for Microbial Ecology, Weihenstephan School of Life Sciences, Technische Universität München, Freising, Germany.,Bavarian Health and Food Safety Authority, Oberschleißheim, Germany
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Treacy J, Jenkins C, Paranthaman K, Jorgensen F, Mueller-Doblies D, Anjum M, Kaindama L, Hartman H, Kirchner M, Carson T, Kar-Purkayastha I. Outbreak of Shiga toxin-producing Escherichia coli O157:H7 linked to raw drinking milk resolved by rapid application of advanced pathogen characterisation methods, England, August to October 2017. ACTA ACUST UNITED AC 2020; 24. [PMID: 31014418 PMCID: PMC6826345 DOI: 10.2807/1560-7917.es.2019.24.16.1800191] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
An outbreak of Shiga toxin-producing Escherichia coli (STEC) O157:H7 occurred on the Isle of Wight between August and October 2017. Of the seven cases linked to the outbreak, five were identified through the statutory notification process and two were identified through national surveillance of whole genome sequencing data. Enhanced surveillance questionnaires established a common link to a farm, and link to the likely food vehicle, raw drinking milk (RDM). Microbiological investigations, including PCR, identified the presence of STEC O157:H7 in samples of RDM. Analysis of core genome single nucleotide polymorphism (SNP) data of STEC O157:H7 from human stool specimens, animal faecal samples and RDM demonstrated a one SNP difference between isolates, and therefore close genetic relatedness. Control measures that were put in place included suspension of sales and recall of RDM, as well as restrictions on public access to parts of the farm. Successful integration of traditional epidemiological surveillance and advanced laboratory methods for the detection and characterisation of STEC O157:H7 from human, animal and environmental samples enabled prompt identification of the outbreak vehicle and provided evidence to support the outbreak control team’s decision-making, leading to implementation of effective control measures in a timely manner.
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Affiliation(s)
- Juli Treacy
- Public Health England South East, Hampshire and Isle of Wight Health Protection Team, Fareham, United Kingdom
| | - Claire Jenkins
- National Infection Service, Public Health England, London, United Kingdom
| | - Karthik Paranthaman
- National Infection Service, Field Epidemiology Service, Public Health England, London, United Kingdom
| | - Frieda Jorgensen
- National Infection Service, Food Water and Environmental Microbiology Laboratory, Public Health England, Porton, United Kingdom
| | | | - Muna Anjum
- Animal and Plant Health Agency, Surrey, United Kingdom
| | - Lukeki Kaindama
- Gastrointestinal Emerging and Zoonoses Infections, Public Health England, London, United Kingdom
| | - Hassan Hartman
- Public Health England South East, Hampshire and Isle of Wight Health Protection Team, Fareham, United Kingdom
| | | | | | - Ishani Kar-Purkayastha
- Public Health England South East, Hampshire and Isle of Wight Health Protection Team, Fareham, United Kingdom
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Fusco V, Chieffi D, Fanelli F, Logrieco AF, Cho G, Kabisch J, Böhnlein C, Franz CMAP. Microbial quality and safety of milk and milk products in the 21st century. Compr Rev Food Sci Food Saf 2020; 19:2013-2049. [DOI: 10.1111/1541-4337.12568] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 04/03/2020] [Accepted: 04/03/2020] [Indexed: 12/11/2022]
Affiliation(s)
- Vincenzina Fusco
- Institute of Sciences of Food Production National Research Council of Italy (CNR‐ISPA) Bari Italy
| | - Daniele Chieffi
- Institute of Sciences of Food Production National Research Council of Italy (CNR‐ISPA) Bari Italy
| | - Francesca Fanelli
- Institute of Sciences of Food Production National Research Council of Italy (CNR‐ISPA) Bari Italy
| | - Antonio F. Logrieco
- Institute of Sciences of Food Production National Research Council of Italy (CNR‐ISPA) Bari Italy
| | - Gyu‐Sung Cho
- Department of Microbiology and BiotechnologyMax‐Rubner Institut Kiel Germany
| | - Jan Kabisch
- Department of Microbiology and BiotechnologyMax‐Rubner Institut Kiel Germany
| | - Christina Böhnlein
- Department of Microbiology and BiotechnologyMax‐Rubner Institut Kiel Germany
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McLauchlin J, Aird H, Elliott A, Forester E, Jørgensen F, Willis C. Microbiological quality of raw drinking milk and unpasteurised dairy products: results from England 2013-2019. Epidemiol Infect 2020; 148:e135. [PMID: 32406346 PMCID: PMC7374804 DOI: 10.1017/s0950268820001016] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 03/21/2020] [Accepted: 05/11/2020] [Indexed: 11/06/2022] Open
Abstract
The aim of this study was to review microbiology results from testing >2500 raw drinking milk and dairy products made with unpasteurised milk examined in England between 2013 and 2019. Samples were collected as part of incidents of contamination, investigation of infections or as part of routine monitoring and were tested using standard methods for a range of both pathogens and hygiene indicators. Results from testing samples of raw cow's milk or cheese made from unpasteurised milk for routine monitoring purposes were overall of better microbiological quality than those collected during incident or investigations of infections. Results from routine monitoring were satisfactory for 62% of milks, 82% of cream, 100% of ice-cream, 51% of butter, 63% of kefir and 79% of cheeses, with 5% of all samples being considered potentially hazardous. Analysis of data from cheese demonstrated a significant association between increasing levels of indicator Escherichia coli with elevated levels of coagulase positive staphylococci and decreased probability of isolation of Shiga toxin-producing E. coli. These data highlight the public health risk associated with these products and provide further justification for controls applied to raw drinking milk and dairy products made with unpasteurised milk.
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Affiliation(s)
- J. McLauchlin
- Public Health England, National Infection Service, Food Water and Environmental Microbiology Services, Colindale, London, UK
| | - H. Aird
- Public Health England, National Infection Service, Food Water and Environmental Microbiology Laboratory York, National Agri-Food Innovation Campus, York, UK
| | - A. Elliott
- Public Health England, National Infection Service, Food Water and Environmental Microbiology Laboratory Porton, Porton Down, Salisbury, UK
- Public Health England, National Infection Service, Field Services, South West, Bristol, UK
| | - E. Forester
- Public Health England, National Infection Service, Food Water and Environmental Microbiology Laboratory York, National Agri-Food Innovation Campus, York, UK
- Public Health England, National Infection Service, Field Services, North West Office, Liverpool, UK
| | - F. Jørgensen
- Public Health England, National Infection Service, Food Water and Environmental Microbiology Laboratory Porton, Porton Down, Salisbury, UK
| | - C. Willis
- Public Health England, National Infection Service, Food Water and Environmental Microbiology Laboratory Porton, Porton Down, Salisbury, UK
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18
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Abstract
There is world-wide increasing interest in the consumption of unprocessed, natural food commodities including fresh (unpasteurised) milk and milk products. Consumers are actively seeking out raw milk, partly due to health reasons, but also for taste, freshness, closeness to the producer and to support local agriculture. The need for high levels of hygiene and safety in farms producing raw milk for direct consumption has long been recognised and has led to federal and industry-initiated systems for safe raw milk production. Raw milk producers in North America and Europe have demonstrated that raw milk, intended for direct consumption, can be produced safe and hygienic. The aim of this paper is to describe practices that have been developed for safe raw milk production. The German Vorzugsmilch is a federally regulated programme for legal raw milk production that was established already in the 1930s to provide raw milk with high hygienic standards controlled for zoonotic diseases to consumers. The Raw Milk Institute is a non-profit organisation established in California that has developed a voluntary safe raw milk programme in North America. RAWMI has developed a risk analysis and management system for raw milk dairy farmers to assist farmers in making individually tailored solutions for various production systems. In British Colombia, Canada, small herd share farms have employed good manufacturing practices, a risk management approach and performed monthly samples for pathogens and indicator bacteria to demonstrate safety and consistency. The major components of the raw milk systems applied, and the results of regular milk microbial indicator bacteria are presented. For the German system, the results from standard monthly pathogen tests are compared to zoonotic pathogen tests from other milk sources. The overall results indicate that raw milk can be produced with a high level of hygiene and safety in various systems.
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Kenyon J, Inns T, Aird H, Swift C, Astbury J, Forester E, Decraene V. Campylobacter outbreak associated with raw drinking milk, North West England, 2016. Epidemiol Infect 2020; 148:e13. [PMID: 32000879 PMCID: PMC7019543 DOI: 10.1017/s0950268820000096] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 12/17/2019] [Accepted: 01/08/2020] [Indexed: 12/03/2022] Open
Abstract
In December 2016, Public Health England investigated an outbreak of campylobacteriosis in North West England, with 69 cases in total. Epidemiological, microbiological and environmental investigations associated the illness with the consumption of unpasteurised cows' milk from Farm X, where milk was predominantly sold from a vending machine. Campylobacter was detected in milk samples which, when sequenced, were identical in sequence type as pathogens isolated from cases (Clonal Complex ST-403, Sequence Type 7432). The farm was served with a Hygiene Emergency Prohibition Order to prevent further cases. To our knowledge, this is the first outbreak of campylobacter associated with unpasteurised milk in England since 1996. Our findings highlighted several important lessons, including that the current testing regime in England for unpasteurised milk is not fit for purpose and that the required warning label should include additional wording, underscoring the risk to vulnerable groups. There has been a substantial increase in both the volume of unpasteurised milk consumed in England and the use of vending machines to sell unpasteurised milk over the last 10 years, making unpasteurised milk more readily accessible to a wider population. The evidence generated from outbreaks like this is therefore critical and should be used to influence policy development.
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Affiliation(s)
- J. Kenyon
- Public Health England North West Centre, Preston, UK
| | - T. Inns
- Field Service, National Infection Service, Public Health England, London, UK
| | - H. Aird
- Food, Water & Environmental Microbiology Laboratory, Public Health England, York, UK
| | - C. Swift
- Gastrointestinal Bacterial Reference Unit, Public Health England, London, UK
| | - J. Astbury
- Public Health England North West Centre, Preston, UK
| | - E. Forester
- Food, Water & Environmental Microbiology Laboratory, Public Health England, York, UK
| | - V. Decraene
- Field Service, National Infection Service, Public Health England, London, UK
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20
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Dupas C, Métoyer B, El Hatmi H, Adt I, Mahgoub SA, Dumas E. Plants: A natural solution to enhance raw milk cheese preservation? Food Res Int 2019; 130:108883. [PMID: 32156345 DOI: 10.1016/j.foodres.2019.108883] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 11/29/2019] [Accepted: 12/01/2019] [Indexed: 01/18/2023]
Abstract
Plants have been traditionnally used for centuries in cheese manufacturing, either for their aromatic properties or as technological auxiliaries (e.g. milk-clotting enzyme preparations, cheese wrappers). Some of these plants are known to have antimicrobial and/or antioxidant properties and could also act as natural preservatives for raw milk and derived dairy products. This review examined the traditional uses of plants in dairy processing, and then focuses on known antimicrobial and antioxidant properties of their extracts (e.g. maceration, decoction, essential oil). Known effects of theses plants on technological flora (starter cultures and microorganisms implicated in cheese ripening) were also summarized, and the potential for plant extracts used in combination with hurdle technologies was explored. Then, legal restriction and bioactivity variations from a culture media to a food matrix was reviewed: non-toxic bioactive molecules found in plants, extract preparation modes suitable with foodgrade processing restrictions, the role of the food matrix as a hindrance to the efficiency of bioactive compounds, and a review of food legislation. Finally, some commercial plant extracts for milk preservation were discussed.
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Affiliation(s)
- Coralie Dupas
- Univ Lyon, Université Claude Bernard Lyon 1, ISARA Lyon, BioDyMIA - Equipe Mixte d'Accueil n°3733, rue Henri de Boissieu, F-01000 Bourg en Bresse, France.
| | - Benjamin Métoyer
- Univ Lyon, Université Claude Bernard Lyon 1, ISARA Lyon, BioDyMIA - Equipe Mixte d'Accueil n°3733, rue Henri de Boissieu, F-01000 Bourg en Bresse, France.
| | - Halima El Hatmi
- Institut des Régions Arides (IRA), Km 22.5, route du Djorf, 4119 Medenine, Tunisia.
| | - Isabelle Adt
- Univ Lyon, Université Claude Bernard Lyon 1, ISARA Lyon, BioDyMIA - Equipe Mixte d'Accueil n°3733, rue Henri de Boissieu, F-01000 Bourg en Bresse, France.
| | - Samir A Mahgoub
- Department of Agricultural Microbiology, Faculty of Agriculture, Zagazig University, 44511, Egypt.
| | - Emilie Dumas
- Univ Lyon, Université Claude Bernard Lyon 1, ISARA Lyon, BioDyMIA - Equipe Mixte d'Accueil n°3733, rue Henri de Boissieu, F-01000 Bourg en Bresse, France.
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21
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Rios-Muñiz D, Cerna-Cortes JF, Lopez-Saucedo C, Angeles-Morales E, Bobadilla-Del Valle M, Ponce-de Leon A, Estrada-Garcia T. Longitudinal Analysis of the Microbiological Quality of Raw Cow's Milk Samples Collected from Three Small Family Dairy Farms in Mexico over a 2-Year Period. J Food Prot 2019; 82:2194-2200. [PMID: 31742445 DOI: 10.4315/0362-028x.jfp-19-155] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
In Mexico, the total milk production that family dairy farms (FDF) contribute is ca. 35%, but this milk is not evaluated for microbiological quality. Forty percent of the milk and dairy products consumed by Mexicans is unpasteurized. In total, 24 raw cow's milk samples from three FDF (one sample per each season from each FDF for two sequent years) were characterized for the presence of food quality indicator organisms, Staphylococcus aureus, Salmonella enterica, Listeria monocytogenes, and Mycobacterium spp., by standard procedures. Escherichia coli presence was also evaluated by a direct count method and diarrheagenic E. coli (DEC) by molecular methods. On the basis of Mexican guidelines for raw milk entering production, 42% of samples exceeded the aerobic mesophilic bacteria limits. A total of 83% raw milk samples were positive for total coliforms, 54% for fecal coliforms, and 46% for E. coli. Forty-three E. coli isolates were selected and characterized for the presence of 11 DEC loci; of theses, 40 isolates were negative for all DEC loci, and 3 isolates, all collected from the same sample, were Shiga toxin 2 (stx2) positive and O157 antigen negative, and one stx2 isolate was resistant to 6 of the 16 antibiotics tested. None of the 24 raw milk samples were positive for Salmonella enterica, L. monocytogenes, or staphylococcal enterotoxin. S. aureus was isolated from nine samples, of which only three samples harbored resistant isolates. From three samples, four nontuberculous mycobacterial isolates were recovered (Mycobacteroides chelonae, Mycobacteroides porcinum, and two Mycobacteroides abscessus). All four isolates produced biofilm and had sliding motility, and three isolates (M. porcinum and two M. abscessus) were resistant to the two antibiotics tested (clarithromycin and linezolid). FDF provide raw milk to a large proportion of the Mexican population, but its consumption could be harmful to health, emphasizing the need to implement national microbiological quality guidelines for raw milk intended for direct human consumption.
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Affiliation(s)
- Diana Rios-Muñiz
- Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas del Instituto Politécnico Nacional, Prolongación Carpio y Plan de Ayala S/N, Col. Casco de Santo Tomas, Ciudad de Mexico, CP 11340, Mexico.,Molecular Biomedicine Department, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Av. IPN 2508, Zacatenco, Mexico City, CP 07360, Mexico
| | - Jorge F Cerna-Cortes
- Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas del Instituto Politécnico Nacional, Prolongación Carpio y Plan de Ayala S/N, Col. Casco de Santo Tomas, Ciudad de Mexico, CP 11340, Mexico
| | - Catalina Lopez-Saucedo
- Molecular Biomedicine Department, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Av. IPN 2508, Zacatenco, Mexico City, CP 07360, Mexico
| | - Erika Angeles-Morales
- Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas del Instituto Politécnico Nacional, Prolongación Carpio y Plan de Ayala S/N, Col. Casco de Santo Tomas, Ciudad de Mexico, CP 11340, Mexico
| | - Miriam Bobadilla-Del Valle
- Departamento de Enfermedades Infecciosas, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubiran, Ciudad de Mexico, CP 14080, Mexico
| | - Alfredo Ponce-de Leon
- Departamento de Enfermedades Infecciosas, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubiran, Ciudad de Mexico, CP 14080, Mexico
| | - Teresa Estrada-Garcia
- Molecular Biomedicine Department, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Av. IPN 2508, Zacatenco, Mexico City, CP 07360, Mexico
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22
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Gastrointestinal infections caused by consumption of raw drinking milk in England & Wales, 1992-2017. Epidemiol Infect 2019; 147:e281. [PMID: 34596012 PMCID: PMC6805749 DOI: 10.1017/s095026881900164x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Systematic, national surveillance of outbreaks of intestinal infectious disease has been undertaken by Public Health England (PHE) since 1992. Between 1992 and 2002, there were 19 outbreaks linked to raw drinking milk (RDM) or products made using raw milk, involving 229 people; 36 of these were hospitalised. There followed an eleven-year period (2003–2013) where no outbreaks linked to RDM were reported. However, since 2014 seven outbreaks of Escherichia coli O157:H7 (n = 3) or Campylobacter jejuni (n = 4) caused by contaminated RDM were investigated and reported. Between 2014 and 2017, there were 114 cases, five reported hospitalisations and one death. The data presented within this review indicated that the risk of RDM has increased since 2014. Despite the labelling requirements and recommendations that children should not consume RDM, almost a third of outbreak cases were children. In addition, there has been an increase in consumer popularity and in registered RDM producers in the UK. The Food Standards Agency (FSA) continue to provide advice on RDM to consumers and have recently made additional recommendations to enhance existing controls around registration and hygiene of RDM producers.
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23
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Moezi P, Kargar M, Doosti A, Khoshneviszadeh M. Multiplex touchdown PCR assay to enhance specificity and sensitivity for concurrent detection of four foodborne pathogens in raw milk. J Appl Microbiol 2019; 127:262-273. [PMID: 31002451 DOI: 10.1111/jam.14285] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 04/12/2019] [Accepted: 04/14/2019] [Indexed: 11/30/2022]
Abstract
AIMS The aim of this study was to develop a multiplex touchdown PCR (multiplex TD-PCR) for rapid and simultaneous detection of four major foodborne pathogens to avoid mispriming and unwanted production during gene amplification. Touchdown PCR is the modified form of standard PCR, which enhances specificity, sensitivity. METHODS AND RESULTS For this reason, a multiplex TD-PCR assay with a pre-enrichment step was developed to detect four foodborne pathogens namely Escherichia coli O157:H7, Listeria monocytogenes, Staphylococcus aureus, and Salmonella enterica serovar Enteritidis in pure culture and raw milk samples. The results showed that this protocol can eliminate the unwanted band or reduce significantly. The detection sensitivity of the single and multiplex TD-PCR was one cell per ml in pure culture. Furthermore, the detection limit of multiplex TD-PCR was one cell per 25 ml for artificially contaminated raw milk. We obtained similar results for detection of aforementioned pathogens in raw milk, after comparing the multiplex TD-PCR method with the traditional culture, except in one or two samples. CONCLUSIONS Hence, the proposed multiplex TD-PCR method could be confirmed as an effective way for rapid optimization of PCR reactions to increase specificity, sensitivity during gene amplification. SIGNIFICANCE AND IMPACT OF THE STUDY Hence, due to its simplicity, cost-effectiveness and being time-saving, it seems that this method is reasonable and economical for rapid optimization of PCR reactions.
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Affiliation(s)
- P Moezi
- Department of Microbiology, Jahrom Branch, Islamic Azad University, Jahrom, Iran
| | - M Kargar
- Department of Microbiology, Jahrom Branch, Islamic Azad University, Jahrom, Iran
| | - A Doosti
- Biotechnology Research Center, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
| | - M Khoshneviszadeh
- Department of Medicinal Chemistry, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran
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24
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Lund BM. Provision of microbiologically safe food for vulnerable people in hospitals, care homes and in the community. Food Control 2019. [DOI: 10.1016/j.foodcont.2018.09.032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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25
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Anderson KL, Kearns R, Lyman R, Correa MT. Staphylococci in dairy goats and human milkers, and the relationship with herd management practices. Small Rumin Res 2019. [DOI: 10.1016/j.smallrumres.2018.11.021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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26
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Paulsen KM, Stuen S, das Neves CG, Suhel F, Gurung D, Soleng A, Stiasny K, Vikse R, Andreassen ÅK, Granquist EG. Tick-borne encephalitis virus in cows and unpasteurized cow milk from Norway. Zoonoses Public Health 2018; 66:216-222. [PMID: 30593734 DOI: 10.1111/zph.12554] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Revised: 11/21/2018] [Accepted: 11/24/2018] [Indexed: 12/30/2022]
Abstract
Tick-borne encephalitis virus (TBEV) is recognized as the most important zoonotic tick-transmitted virus in Europe. TBEV is mainly transmitted to humans through bites from TBEV-infected ticks (Ixodes ricinus and Ixodes persulcatus). However, alimentary infection after consumption of unpasteurized milk and cheese from domestic ruminants has been reported. There is little information about TBEV in ruminants in Norway. The objectives of this study were to analyse unpasteurized cow milk for TBEV RNA and to study the presence of IgG antibodies to TBEV in the same animals. A total of 112 milk and blood samples were collected from cows from five different farms spread from southern to northern Norway. The milk samples were analysed by an in-house reverse transcription (RT) real-time polymerase chain reaction and confirmed by pyrosequencing. Serum samples were screened by a commercial enzyme-linked immunosorbent assay and verified by a TBEV-specific serum neutralization test. We found TBEV RNA in unpasteurized milk collected from farms in the municipalities of Mandal, Skedsmo and Brønnøy in 5.4% of the tested animals. Specific antibodies to TBEV were only detected in Arendal, where 88.2% of the tested animals were positive. Further studies on milk containing TBEV RNA should be performed to conclude if TBEV found in unpasteurized milk in Norway is infectious, which could be of great importance in a One Health perspective.
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Affiliation(s)
- Katrine M Paulsen
- Division for Infection Control and Environmental Health, Department of Virology, Norwegian Institute of Public Health, Oslo, Norway.,Faculty of Veterinary Medicine, Department of Production Animal Clinical Sciences, Norwegian University of Life Sciences, Oslo, Norway
| | - Snorre Stuen
- Department of Production Animal Clinical Sciences, Section of Small Ruminant Research and Herd Health, Norwegian University of Life Sciences, Sandnes, Norway
| | | | | | - Deepa Gurung
- Division for Infection Control and Environmental Health, Department of Virology, Norwegian Institute of Public Health, Oslo, Norway
| | - Arnulf Soleng
- Division for Infection Control and Environmental Health, Department of Pest Control, Norwegian Institute of Public Health, Oslo, Norway
| | - Karin Stiasny
- Center for Virology, Medical University of Vienna, Vienna, Austria
| | - Rose Vikse
- Division for Infection Control and Environmental Health, Department of Virology, Norwegian Institute of Public Health, Oslo, Norway
| | - Åshild K Andreassen
- Division for Infection Control and Environmental Health, Department of Virology, Norwegian Institute of Public Health, Oslo, Norway
| | - Erik G Granquist
- Faculty of Veterinary Medicine, Department of Production Animal Clinical Sciences, Norwegian University of Life Sciences, Oslo, Norway
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Alegbeleye OO, Guimarães JT, Cruz AG, Sant’Ana AS. Hazards of a ‘healthy’ trend? An appraisal of the risks of raw milk consumption and the potential of novel treatment technologies to serve as alternatives to pasteurization. Trends Food Sci Technol 2018. [DOI: 10.1016/j.tifs.2018.10.007] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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