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Garofalo G, Ponte M, Busetta G, Tolone M, Bonanno A, Portolano B, Gaglio R, Erten H, Sardina MT, Settanni L. A Thorough Investigation of the Microbiological, Physicochemical, and Sensory Properties of Ewe's Yoghurt Fermented by a Selected Multi-Strain Starter Culture. Foods 2023; 12:3454. [PMID: 37761162 PMCID: PMC10529652 DOI: 10.3390/foods12183454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 09/13/2023] [Accepted: 09/14/2023] [Indexed: 09/29/2023] Open
Abstract
This work was carried out with the aim to investigate the microbiological, physicochemical, and sensory properties of an innovative yoghurt produced from ewe's milk. Experimental yoghurt productions were performed with a commercial freeze-dried starter preparation and a natural milk starter culture (NMSC) of Streptococcus thermophilus and Lactobacillus delbrueckii. The two yoghurts did not differ for colour parameters, showing an average value of lightness, redness, and yellowness of 94.99, -3.74, and 9.37, respectively. The yoghurt produced using the NMSC as a fermenting agent was characterised by a significantly lower fat percentage and a higher antioxidant potential than commercial starters. Microbiological analysis confirmed the safety of the final product and a level of living lactic acid bacteria of 108 CFU/g. Sensory analysis revealed some differences among yoghurts regarding unpleasant odour, homogeneity, and persistence in the mouth, but the yoghurt processed with NMSC was more appreciated. Thus, the production of ewe's yoghurt fermented by a selected multi-strain starter culture represents an interesting strategy to enlarge the functional ovine dairy product portfolio.
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Affiliation(s)
- Giuliana Garofalo
- Department of Agricultural, Food and Forest Sciences, University of Palermo, Viale delle Scienze, Bldg. 5, 90128 Palermo, Italy; (G.G.); (M.P.); (G.B.); (M.T.); (A.B.); (B.P.); (M.T.S.); (L.S.)
| | - Marialetizia Ponte
- Department of Agricultural, Food and Forest Sciences, University of Palermo, Viale delle Scienze, Bldg. 5, 90128 Palermo, Italy; (G.G.); (M.P.); (G.B.); (M.T.); (A.B.); (B.P.); (M.T.S.); (L.S.)
| | - Gabriele Busetta
- Department of Agricultural, Food and Forest Sciences, University of Palermo, Viale delle Scienze, Bldg. 5, 90128 Palermo, Italy; (G.G.); (M.P.); (G.B.); (M.T.); (A.B.); (B.P.); (M.T.S.); (L.S.)
| | - Marco Tolone
- Department of Agricultural, Food and Forest Sciences, University of Palermo, Viale delle Scienze, Bldg. 5, 90128 Palermo, Italy; (G.G.); (M.P.); (G.B.); (M.T.); (A.B.); (B.P.); (M.T.S.); (L.S.)
| | - Adriana Bonanno
- Department of Agricultural, Food and Forest Sciences, University of Palermo, Viale delle Scienze, Bldg. 5, 90128 Palermo, Italy; (G.G.); (M.P.); (G.B.); (M.T.); (A.B.); (B.P.); (M.T.S.); (L.S.)
| | - Baldassare Portolano
- Department of Agricultural, Food and Forest Sciences, University of Palermo, Viale delle Scienze, Bldg. 5, 90128 Palermo, Italy; (G.G.); (M.P.); (G.B.); (M.T.); (A.B.); (B.P.); (M.T.S.); (L.S.)
| | - Raimondo Gaglio
- Department of Agricultural, Food and Forest Sciences, University of Palermo, Viale delle Scienze, Bldg. 5, 90128 Palermo, Italy; (G.G.); (M.P.); (G.B.); (M.T.); (A.B.); (B.P.); (M.T.S.); (L.S.)
| | - Hüseyin Erten
- Department of Food Engineering, Faculty of Engineering, Çukurova University, Adana 1330, Turkey;
| | - Maria Teresa Sardina
- Department of Agricultural, Food and Forest Sciences, University of Palermo, Viale delle Scienze, Bldg. 5, 90128 Palermo, Italy; (G.G.); (M.P.); (G.B.); (M.T.); (A.B.); (B.P.); (M.T.S.); (L.S.)
| | - Luca Settanni
- Department of Agricultural, Food and Forest Sciences, University of Palermo, Viale delle Scienze, Bldg. 5, 90128 Palermo, Italy; (G.G.); (M.P.); (G.B.); (M.T.); (A.B.); (B.P.); (M.T.S.); (L.S.)
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Yap M, Gleeson D, O’Toole PW, O’Sullivan O, Cotter PD. Seasonality and Geography Have a Greater Influence than the Use of Chlorine-Based Cleaning Agents on the Microbiota of Bulk Tank Raw Milk. Appl Environ Microbiol 2021; 87:e0108121. [PMID: 34469196 PMCID: PMC8552886 DOI: 10.1128/aem.01081-21] [Citation(s) in RCA: 6] [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: 06/02/2021] [Accepted: 08/20/2021] [Indexed: 11/20/2022] Open
Abstract
Cleaning of the production environment is vital to ensure the safety and quality of dairy products. Although cleaning with chlorine-based agents is widely adopted, it has been associated with detrimental effects on milk quality and safety, which has garnered increasing interest in chlorine-free cleaning. However, the influence of these methods on the milk microbiota is not well documented. This study investigated the factors that influence the raw milk microbiota, with a focus on the differences when chlorine-based and chlorine-free cleaning of milking equipment are used. Bulk tank raw milk was sampled during three sampling months (April, August, and November), from farms across Ireland selected to capture the use of different cleaning methods, i.e., exclusively chlorine-based (n = 51) and chlorine-free cleaning (n = 92) and farms that used chlorine-free agents for the bulk tank and chlorine-based cleaning agents for the rest of the equipment (n = 28). Shotgun metagenomic analysis revealed the significant influence of seasonal and geographic factors on the bulk tank milk microbiota, indicated by differences in diversity, taxonomic composition, and functional characteristics. Taxonomic and functional profiles of samples collected in November clustered separately from those of samples collected in other months. In contrast, cleaning methods only accounted for 1% of the variation in the bulk tank milk bacterial community, and samples collected from farms using chlorine-based versus chlorine-free cleaning did not differ significantly, suggesting that the chlorine-free approaches used did not negatively impact microbiological quality. This study shows the value of shotgun metagenomics in advancing our knowledge of the raw milk microbiota. IMPORTANCE The microbiota of raw milk is affected by many factors that can control or promote the introduction of undesirable microorganisms. Chlorine-based cleaning agents have been commonly used due to their effectiveness in controlling undesirable microorganisms, but they have been associated with the formation of chlorine residues that are detrimental to product quality and may impact consumer health. Chlorine-free alternatives have been recommended in some countries, but the influence of cleaning agents on the milk microbiota is unknown. Here, we investigated the influence of cleaning methods and other factors on bulk tank raw milk. Results showed that season and location had a greater influence on the milk microbiota than the cleaning agents used. Indeed, the similar microbiota compositions of raw milk from farms that used chlorine-based and those that used chlorine-free cleaning methods supports the further use of chlorine-free cleaning agents in dairy production.
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Affiliation(s)
- Min Yap
- Food Bioscience Department, Teagasc Food Research Centre, Fermoy, Ireland
- School of Microbiology, University College Cork, Cork, Ireland
| | - David Gleeson
- Teagasc Animal and Grassland Research and Innovation Centre, Fermoy, Ireland
| | - Paul W. O’Toole
- School of Microbiology, University College Cork, Cork, Ireland
- APC Microbiome Ireland, Cork, Ireland
| | - Orla O’Sullivan
- Food Bioscience Department, Teagasc Food Research Centre, Fermoy, Ireland
- APC Microbiome Ireland, Cork, Ireland
| | - Paul D. Cotter
- Food Bioscience Department, Teagasc Food Research Centre, Fermoy, Ireland
- APC Microbiome Ireland, Cork, Ireland
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Berhanu L, Gume B, Kassa T, Dadi LS, Tegegne D, Getnet M, Bediru H, Getaneh A, Suleman S, Mereta ST. Microbial quality of raw cow milk and its predictors along the dairy value chain in Southwest Ethiopia. Int J Food Microbiol 2021; 350:109228. [PMID: 34023681 DOI: 10.1016/j.ijfoodmicro.2021.109228] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2020] [Revised: 04/02/2021] [Accepted: 04/26/2021] [Indexed: 11/27/2022]
Abstract
Raw milk may contain pathogenic microorganism that can seriously affect the health of consumers. In Southwest Ethiopia, raw cow milk is consumed more than the processed products, but its microbiological quality and its predictors are not studied well. The aim of this study was to determine the microbial quality of raw cow milk and its predictors along the dairy value chain in Southwest Ethiopia. A total of 150 milk and 300 environmental samples were collected randomly from dairy farms, milk distribution centers, and retailer outlets for microbiological analysis using standard protocols. One milk handler from each milk production or distribution stage was also interviewed to assess the knowledge, attitude, and practices regarding milk handling. Descriptive statistics and multiple linear regression models were used to summarize the data and to identify predictors of milk microbial quality, respectively. As the milk transported from dairy farm to milk retailer outlet, the mean total bacterial count has increased from 5.0 ± 0.3 to 7.2 ± 0.1 log CFU/ml respectively. The mean coliform count of the milk sample was 4.4 ± 0.4 log CFU/ml at the dairy farm and 7.0 ± 0.2 log CFU/ml at milk selling points, indicating the deterioration of milk quality along the dairy value chain. All of the analyzed water samples were positive for fecal coliform bacteria. The highest coliform bacteria were reported from milk storage equipment found at milk retailer outlet with the count of 4.8 ± 0.5 log CFU/ml. Educational status and attitude of milk handlers and the quality of water used to wash milk equipment and hands of milk handlers were the major factors affecting the microbial quality of raw cow milk. The findings of this study revealed that the microbial quality of raw milk in the study area was poor. Hence, improving the attitude and educational status of milk handlers, and the quality of water is an important step to enhance milk quality and consequently to prevent milk borne diseases.
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Affiliation(s)
- Leykun Berhanu
- Department of Environmental Health Science, Wollo University, P.O. Box 1145, Dessie, Ethiopia.
| | - Beje Gume
- Department of Environmental Health Science and Technology, Jimma University, P.O. Box 378, Jimma, Ethiopia
| | - Tesfaye Kassa
- School of Medical Laboratory Science, Jimma University, P.O. Box 788, Jimma, Ethiopia
| | - Lelisa Sena Dadi
- Department of Epidemiology, Jimma University, P.O. Box 378, Jimma, Ethiopia
| | - Dechassa Tegegne
- School of Veterinary Medicine, Jimma University, P.O. Box 307, Jimma, Ethiopia
| | - Masrie Getnet
- Department of Epidemiology, Jimma University, P.O. Box 378, Jimma, Ethiopia
| | - Habib Bediru
- Jimma Zone Livestock and Fishery Development Office, P.O. Box 378, Jimma, Ethiopia
| | - Assegid Getaneh
- School of Veterinary Medicine, Jimma University, P.O. Box 307, Jimma, Ethiopia
| | - Sultan Suleman
- Department of Pharmacy, Jimma University, P.O. Box 378, Jimma, Ethiopia
| | - Seid Tiku Mereta
- Department of Environmental Health Science and Technology, Jimma University, P.O. Box 378, Jimma, Ethiopia
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Sah K, Karki P, Shrestha RD, Sigdel A, Adesogan AT, Dahl GE. MILK Symposium review: Improving control of mastitis in dairy animals in Nepal. J Dairy Sci 2021; 103:9740-9747. [PMID: 33076185 DOI: 10.3168/jds.2020-18314] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Accepted: 07/23/2020] [Indexed: 11/19/2022]
Abstract
Dairy animals are an important source of income, food, and nutritional security, and improvements in the productivity of dairy animals substantially improve the wellbeing of smallholder dairy farmers. As in other developing countries, dairy animals are key for rural livelihoods in Nepal but often suffer from mastitis-a production disease causing economic losses to farmers, challenges to the dairy processing industry, and possible health hazards to consumers. Studies show that the prevalence of subclinical mastitis in Africa and Asia typically exceeds 50%, threatening animal wellbeing, farmers, dairy processors, and consumers. We conducted a study in Nepal to develop a technology training package to control mastitis in dairy animals. Following identification of knowledge gaps, a technology package consisting of (1) developing good husbandry practices, implementing mastitis detection and control technologies; and (2) training technicians and farmers was implemented. A strategy was subsequently established to provide feedback to farmers in dairy cooperatives on the subclinical mastitis status of their cows. The package was applied in the mid-western region of Nepal. Six months after implementation, we observed a reduction in subclinical mastitis prevalence: from 55% (baseline) to 28% (endline; n = 432) in dairy cows and from 78% to 18% (n = 216) in buffalo. These positive study outcomes strongly suggest that the mastitis technology training package should be scaled across smallholder farmers within and beyond Nepal to control mastitis in dairy animals.
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Affiliation(s)
- Keshav Sah
- Heifer International Nepal, Hattiban, Lalitpur 6043, Nepal.
| | - Prerana Karki
- Heifer International Nepal, Hattiban, Lalitpur 6043, Nepal
| | - Rima D Shrestha
- Himalayan College of Agricultural Sciences and Technology, Kathmandu 44600, Nepal
| | - Anil Sigdel
- Department of Animal Sciences, University of Florida, Gainesville 32611
| | | | - Geoffrey E Dahl
- Department of Animal Sciences, University of Florida, Gainesville 32611
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Cremonesi P, Morandi S, Ceccarani C, Battelli G, Castiglioni B, Cologna N, Goss A, Severgnini M, Mazzucchi M, Partel E, Tamburini A, Zanini L, Brasca M. Raw Milk Microbiota Modifications as Affected by Chlorine Usage for Cleaning Procedures: The Trentingrana PDO Case. Front Microbiol 2020; 11:564749. [PMID: 33123103 PMCID: PMC7573252 DOI: 10.3389/fmicb.2020.564749] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Accepted: 09/16/2020] [Indexed: 11/13/2022] Open
Abstract
Milk microbiota represents a key point in raw milk cheese production and contributes to the development of typical flavor and texture for each type of cheese. The aim of the present study was to evaluate the influence of chlorine products usage for cleaning and sanitizing the milking equipment on (i) raw milk microbiota; (ii) the deriving whey-starter microbiota; and (iii) Trentingrana Protected Designation of Origin (PDO) cheese microbiota and volatilome. Milk samples from three farms affiliated to a Trentingrana PDO cheese factory were collected three times per week during a 6-weeks period in which a sodium hypochlorite detergent (period C) was used and during a subsequent 6-weeks period of non-chlorine detergent usage (period NC). Samples were subjected to microbiological [Standard Plate Count; coliforms; coagulase-positive staphylococci; and lactic acid bacteria (LAB)] and metagenomic analysis (amplification of V3-V4 regions of 16S rRNA gene performed on Illumina MiSeq platform). In addition, cheese volatilome was determined by SPME-GC-MS. In the transition from period C to period NC, higher SPC and LAB counts in milk were recorded. Milk metagenomic analysis showed a peculiar distinctive microbiota composition for the three farms during the whole experimental period. Moreover, differences were highlighted comparing C and NC periods in each farm. A difference in microbial population related to chlorine usage in bulk milk and vat samples was evidenced. Moreover, chlorine utilization at farm level was found to affect the whey-starter population: the usually predominant Lactobacillus helveticus was significantly reduced during NC period, whereas Lactobacillus delbrueckii had the exact opposite trend. Alpha- and beta-diversity revealed a separation between the two treatment periods with a higher presence of L. helveticus, L. delbrueckii, and Streptococcus thermophilus in cheese samples after NC detergent period. Cheese volatilome analysis showed a slight decrease in lipolysis during C period in the inner part of the cheese wheel. Although preliminary, these results suggest a profound influence on milk and cheese microbiota, as well as on raw milk cheese production and quality, due to the use of chlorine. However, further studies will be needed to better understand the complex relationship between chlorine and microbiota along all the cheese production steps.
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Affiliation(s)
- Paola Cremonesi
- Institute of Agricultural Biology and Biotechnology, Italian National Research Council, Lodi, Italy
| | - Stefano Morandi
- Institute of Sciences of Food Production, Italian National Research Council, Milan, Italy
| | - Camilla Ceccarani
- Institute of Biomedical Technologies, Italian National Research Council, Segrate, Italy
- Department of Health Sciences, San Paolo Hospital Medical School, University of Milan, Milan, Italy
| | - Giovanna Battelli
- Institute of Sciences of Food Production, Italian National Research Council, Milan, Italy
| | - Bianca Castiglioni
- Institute of Agricultural Biology and Biotechnology, Italian National Research Council, Lodi, Italy
| | - Nicola Cologna
- Trentingrana–Consorzio dei Caseifici Sociali Trentini s.c.a., Trento, Italy
| | - Andrea Goss
- Trentingrana–Consorzio dei Caseifici Sociali Trentini s.c.a., Trento, Italy
| | - Marco Severgnini
- Institute of Biomedical Technologies, Italian National Research Council, Segrate, Italy
| | | | - Erika Partel
- Technology Transfer Center, Edmund Mach Foundation, Trento, Italy
| | - Alberto Tamburini
- Department of Agricultural and Environmental Sciences, Faculty of Agricultural and Food Sciences, University of Milan, Milan, Italy
| | | | - Milena Brasca
- Institute of Sciences of Food Production, Italian National Research Council, Milan, Italy
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Lindahl JF, Deka RP, Asse R, Lapar L, Grace D. Hygiene knowledge, attitudes and practices among dairy value chain actors in Assam, north-east India and the impact of a training intervention. Infect Ecol Epidemiol 2019. [DOI: 10.1080/20008686.2018.1555444] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Affiliation(s)
- Johanna F. Lindahl
- Department of Biosciences, International Livestock Research Institute, Nairobi, Kenya
- Department of Clinical Sciences, Swedish University of Agricultural Sciences, Uppsala, Sweden
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
| | - Ram Pratim Deka
- Department of Biosciences, International Livestock Research Institute, Guwahati, Assam, India
| | | | - Lucy Lapar
- Department of Integrated Sciences, International Livestock Research Institute, Hanoi, Vietnam
| | - Delia Grace
- Department of Biosciences, International Livestock Research Institute, Nairobi, Kenya
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Sannat C, Nair A, Sahu SB, Sahasrabudhe SA, Kumar A, Gupta AK, Shende RK. Critical sources of bacterial contamination and adoption of standard sanitary protocol during semen collection and processing in Semen Station. Vet World 2015; 8:631-5. [PMID: 27047147 PMCID: PMC4774725 DOI: 10.14202/vetworld.2015.631-635] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Revised: 04/11/2015] [Accepted: 04/19/2015] [Indexed: 11/16/2022] Open
Abstract
Aim: The present investigation was conducted to locate the critical sources of bacterial contamination and to evaluate the standard sanitation protocol so as to improve the hygienic conditions during collection, evaluation, and processing of bull semen in the Semen Station. Materials and Methods: The study compared two different hygienic procedures during the collection, evaluation and processing of semen in Central Semen Station, Anjora, Durg. Routinely used materials including artificial vagina (AV) inner liner, cone, semen collection tube, buffer, extender/diluter, straws; and the laboratory environment like processing lab, pass box and laminar air flow (LAF) cabinet of extender preparation lab, processing lab, sealing filling machine, and bacteriological lab were subjected to bacteriological examination in two phases of study using two different sanitary protocols. Bacterial load in above items/environment was measured using standard plate count method and expressed as colony forming unit (CFU). Results: Bacterial load in a laboratory environment and AV equipments during two different sanitary protocol in present investigation differed highly significantly (p<0.001). Potential sources of bacterial contamination during semen collection and processing included laboratory environment like processing lab, pass box, and LAF cabinets; AV equipments, including AV Liner and cone. Bacterial load was reduced highly significantly (p<0.001) in AV liner (from 2.33±0.67 to 0.50±0.52), cone (from 4.16±1.20 to 1.91±0.55), and extender (from 1.33±0.38 to 0) after application of improved practices of packaging, handling, and sterilization in Phase II of study. Glasswares, buffers, and straws showed nil bacterial contamination in both the phases of study. With slight modification in fumigation protocol (formalin @600 ml/1000 ft3), bacterial load was significantly decreased (p<0.001) up to 0-6 CFU in processing lab (from 6.43±1.34 to 2.86±0.59), pass box (from 12.13±2.53 to 3.78±0.79), and nil bacterial load was reported in LAFs. Conclusion: Appropriate and careful management considering critical points step by step starting right from collection of semen to their processing can significantly minimize bacterial contamination.
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Affiliation(s)
- Chandrahas Sannat
- Department of Veterinary Microbiology, College of Veterinary Science & A.H., Chhattisgarh Kamdhenu Vishwavidyalaya, Anjora, Durg, Chhattisgarh, India
| | - Ajit Nair
- Central Semen Station, Livestock Development Department, Government of Chhattisgarh, Anjora, Durg, Chhattisgarh, India
| | - S B Sahu
- Central Semen Station, Livestock Development Department, Government of Chhattisgarh, Anjora, Durg, Chhattisgarh, India
| | - S A Sahasrabudhe
- Central Semen Station, Livestock Development Department, Government of Chhattisgarh, Anjora, Durg, Chhattisgarh, India
| | - Ashish Kumar
- Department of Veterinary Microbiology, College of Veterinary Science & A.H., Chhattisgarh Kamdhenu Vishwavidyalaya, Anjora, Durg, Chhattisgarh, India
| | - Amit Kumar Gupta
- Department of Veterinary Microbiology, College of Veterinary Science & A.H., Chhattisgarh Kamdhenu Vishwavidyalaya, Anjora, Durg, Chhattisgarh, India
| | - R K Shende
- Department of Veterinary Microbiology, College of Veterinary Science & A.H., Chhattisgarh Kamdhenu Vishwavidyalaya, Anjora, Durg, Chhattisgarh, India
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