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Dairy microbiology

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https://www.readbyqxmd.com/read/29166174/low-prevalence-of-salmonella-and-shiga-toxin-producing-escherichia-coli-in-lymph-nodes-of-australian-beef-cattle
#1
Gavin Bailey, Long Huynh, Lachlan Govenlock, David Jordan, Ian Jenson
Salmonella contamination of ground beef has been viewed as originating from the surface of carcasses. Recent studies have identified lymph nodes as a potential source of Salmonella contamination because these tissues play an active role in containment of pathogens in the live animal and because some lymph nodes are unavoidably present in manufacturing beef trimmings or primal cuts that may be incorporated into ground beef. A survey was conducted of the microbiological status of lymph nodes from Australian cattle at the time of slaughter to determine the prevalence of microbiological contamination...
November 22, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/29157376/epidemiological-and-partial-budget-analysis-for-treatment-of-subclinical-staphylococcus-aureus-intramammary-infections-considering-microbiological-and-cytological-scenarios
#2
Inge-Marié Petzer, Eric M C Etter, Edward F Donkin, Edward C Webb, Joanne Karzis
An innovative method was investigated to aid in the elimination of Staphylococcus aureus (S. aureus) intramammary infections (IMI) from dairy herds. A stochastic model explore the economic benefit of three-day or eight-day treatment of subclinical IMI in all S. aureus infected cows or in only those with a somatic cell count (SCC) exceeding 200,000 cells/ml. An epidemiological model was developed to run parallel to the economic model that would predict the S. aureus IMI likely to persist, develop new infections and clinical mastitis...
December 1, 2017: Preventive Veterinary Medicine
https://www.readbyqxmd.com/read/29153181/a-100-year-review-microbiology-and-safety-of-milk-handling
#3
Kathryn J Boor, Martin Wiedmann, Sarah Murphy, Sam Alcaine
Microbes that may be present in milk can include pathogens, spoilage organisms, organisms that may be conditionally beneficial (e.g., lactic acid bacteria), and those that have not been linked to either beneficial or detrimental effects on product quality or human health. Although milk can contain a full range of organisms classified as microbes (i.e., bacteria, viruses, fungi, and protozoans), with few exceptions (e.g., phages that affect fermentations, fungal spoilage organisms, and, to a lesser extent, the protozoan pathogens Cryptosporidium and Giardia) dairy microbiology to date has focused predominantly on bacteria...
December 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29153179/a-100-year-review-a-century-of-dairy-processing-advancements-pasteurization-cleaning-and-sanitation-and-sanitary-equipment-design
#4
S A Rankin, R L Bradley, G Miller, K B Mildenhall
Over the past century, advancements within the mainstream dairy foods processing industry have acted in complement with other dairy-affiliated industries to produce a human food that has few rivals with regard to safety, nutrition, and sustainability. These advancements, such as milk pasteurization, may appear commonplace in the context of a modern dairy processing plant, but some consideration of how these advancements came into being serve as a basis for considering what advancements will come to bear on the next century of processing advancements...
December 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29152416/microbial-agents-in-macroscopically-healthy-mammary-gland-tissues-of-small-ruminants
#5
Liliana Spuria, Elena Biasibetti, Donal Bisanzio, Ilaria Biasato, Daniele De Meneghi, Patrizia Nebbia, Patrizia Robino, Paolo Bianco, Michele Lamberti, Claudio Caruso, Alessia Di Blasio, Simone Peletto, Loretta Masoero, Alessandro Dondo, Maria Teresa Capucchio
Background: Health of mammary glands is fundamental for milk and dairy products hygiene and quality, with huge impacts on consumers welfare. Methods: This study aims to investigate the microbial agents (bacteria, fungi and lentiviruses) isolated from 89 macroscopically healthy udders of regularly slaughtered small ruminants (41 sheep, 48 goats), also correlating their presence with the histological findings. Multinomial logistic regression was applied to evaluate the association between lesions and positivity for different microbial isolates, animal age and bacteria...
2017: PeerJ
https://www.readbyqxmd.com/read/29131683/persistence-of-non-o157-shiga-toxin-producing-escherichia-coli-in-dairy-compost-during-storage
#6
Hongye Wang, Muthu Dharmasena, Zhao Chen, Xiuping Jiang
Dairy compost with 20, 30, or 40% moisture content (MC) was inoculated with a mixture of six non-O157 Shiga toxin-producing Escherichia coli (STEC) serovars at a final concentration of 5.1 log CFU/g and then stored at 22 and 4°C for 125 days. Six storage conditions-4°C and 20% MC, 4°C and 30% MC, 4°C and 40% MC, 22°C and 20% MC, 22°C and 30% MC, and 22°C and 40% MC-were investigated for the persistence of non-O157 STEC in the dairy compost. During the entire storage, fluctuations in indigenous mesophilic bacterial levels were observed within the first 28 days of storage...
November 14, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/29119089/evaluation-of-some-microbiological-and-chemical-parameters-of-campania-buffalo-ricotta-cheese
#7
Angela M I Montone, Alessandra De Felice, Roberta Brunetti, Domenico Mollica, Salvatore Capo, Federico Capuano, Achille Guarino, Donatella Nava
Fresh ricotta (whey cheese), owing to its technological characteristics and intrinsic parameters (pH and a(w)), is an excellent substrate for the growth of spoilage and pathogenic microorganisms. On 19 July 2010, Campania buffalo ricotta cheese was assigned to the register of Protected Designations of Origin (PDO) by the European Commission, with EC Reg. 634/2010. It is mainly produced in the provinces of Caserta and Salerno around the rivers Garigliano and Volturno, the plain of the river Sele and the area of Cilento...
August 16, 2017: Italian Journal of Food Safety
https://www.readbyqxmd.com/read/29054139/mc-media-pad-acplus%C3%A2-for-enumeration-of-aerobic-counts-in-a-variety-of-foods
#8
Hajime Teramura, Gail Betts
The MC-Media Pad ACplus™ is a dry, rehydratable film medium for the enumeration of aerobic bacterial colonies.The performance of the method in a variety of foods was compared to that of U.S. reference methods: U.S. Department of Agriculture (USDA) Food Safety and Inspection Service (FSIS) Microbiology Laboratory Guidebook (MLG) Chapter 3.02 "Quantitative Analysis of Bacteria in Foods as Sanitary Indicators" (USDA/FSIS MLG 3.02); Standard Methods for the Examination of Dairy Products (SMEDP) Chapter 6 "Microbiological Count Methods, Standard Plate Count Method" (SMEDP 6); AOAC Official Method(SM)966...
October 20, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/29032653/bacterial-hormone-sensitive-lipases-bhsls-emerging-enzymes-for-biotechnological-applications
#9
REVIEW
T Doohun Kim
Lipases are important enzymes with biotechnological applications in dairy, detergent, food, fine chemicals, and pharmaceutical industries. Specifically, hormone-sensitive lipase (HSL) is an intracellular lipase that can be stimulated by several hormones such as catecholamine, glucagon, and adrenocorticotropic hormone (ACTH). Bacterial hormone-sensitive lipases (bHSLs), which are homologous to the C-terminal domain of HSL, have α/β-hydrolase fold with a catalytic triad composed of His, Asp, and Ser. These bHSLs could be used for a wide variety of industrial applications because of their high activity, broad substrate specificity, and remarkable stability...
October 14, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28987590/viable-mycobacterium-avium-ssp-paratuberculosis-isolated-from-calf-milk-replacer
#10
Irene R Grant, Antonio C G Foddai, James C Tarrant, Brenna Kunkel, Faye A Hartmann, Sheila McGuirk, Chungyi Hansen, Adel M Talaat, Michael T Collins
When advising farmers on how to control Johne's disease in an infected herd, one of the main recommendations is to avoid feeding waste milk to calves and instead feed calf milk replacer (CMR). This advice is based on the assumption that CMR is free of viable Mycobacterium avium ssp. paratuberculosis (MAP) cells, an assumption that has not previously been challenged. We tested commercial CMR products (n = 83) obtained from dairy farms around the United States by the peptide-mediated magnetic separation (PMS)-phage assay, PMS followed by liquid culture (PMS-culture), and direct IS900 quantitative PCR (qPCR)...
October 4, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28985995/aerobic-granular-sludge-technology-mechanisms-of-granulation-and-biotechnological-applications
#11
REVIEW
Y V Nancharaiah, G Kiran Kumar Reddy
Aerobic granular sludge (AGS) is a novel microbial community which allows simultaneous removal of carbon, nitrogen, phosphorus and other pollutants in a single sludge system. AGS is distinct from activated sludge in physical, chemical and microbiological properties and offers compact and cost-effective treatment for removing oxidized and reduced contaminants from wastewater. AGS sequencing batch reactors have shown their utility in the treatment of abattoir, live-stock, rubber, landfill leachate, dairy, brewery, textile and other effluents...
September 21, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28964915/novel-insights-into-the-microbiology-of-fermented-dairy-foods
#12
REVIEW
Guerrino Macori, Paul D Cotter
Fermentation is a traditional approach to food preservation that, in addition to improving food safety, also confers enhanced organoleptic, nutritional, and health-promoting attributes upon those foods. Dairy products can be fermented by a diverse microbiota. The accompanying microbes can be studied using a variety of different, including 'omics'-based, approaches that can reveal their composition and functionality. These methods have increasingly been recently applied to study fermented dairy foods from the perspective of genetic diversity, functionality and succession...
September 28, 2017: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/28941892/folates-biosynthesis-by-streptococcus-thermophilus-during-growth-in-milk
#13
Aurora Meucci, Lia Rossetti, Miriam Zago, Lucia Monti, Giorgio Giraffa, Domenico Carminati, Flavio Tidona
The ability of folate-producer strains of Streptococcus thermophilus to accumulate folates and the expression of two target genes (folK and folP), involved in the folate biosynthesis, were studied during milk fermentation. An over-expression of folK took place only in the early phase of growth, whereas folP was mainly expressed in the mid log-phase of growth and declined thereafter. The accumulation of total folates, which was quantified by a microbiological assay, was strain-dependent. Two major forms of folates, i...
February 2018: Food Microbiology
https://www.readbyqxmd.com/read/28911652/microbiological-histological-and-biochemical-evidence-for-the-adverse-effects-of-food-azo-dyes-on-rats
#14
Khaled Elbanna, Osama Mohamed Sarhan, Manal Khider, Mohamed Elmogy, Hussein Hasan Abulreesh, Mohamed Rabie Shaaban
In this study, 120 lactic acid bacterial strains from different fermented dairy products as well as 10 bacterial intestinal isolates were evaluated for in vitro and in vivo degradation of various food azo dyes. Of these isolates, lactic acid bacteria (LAB) strains 13 and 100 and the intestinal isolates Ent2 and Eco5 exhibited 96-98% degradation of the tested food azo dyes within 5-6 hours. High performance liquid chromatography mass spectra of sunset yellow (E110) and carmoisine (E122) anaerobic degradation products by the intestinal isolates showed that they were structurally related to toxic aromatic amines...
July 2017: Journal of Food and Drug Analysis
https://www.readbyqxmd.com/read/28884331/paratuberculosis-in-latin-america-a-systematic-review
#15
REVIEW
I F Espeschit, D G G Schwarz, A C S Faria, M C C Souza, F A Paolicchi, R A Juste, I A Carvalho, M A S Moreira
Latin America is the definition of the American group, where languages of Latin origin are spoken, including countries in South, Central, and North America. Paratuberculosis is a gastrointestinal contagious chronic disease that affects ruminants, whose etiological agent is the bacilli Mycobacterium avium subsp. paratuberculosis (MAP). Paratuberculosis is characterized by intermittent diarrhea, decreased milk production, dehydration, and progressive weight loss and is possibly involved in Crohn's disease, a human intestinal disease...
December 2017: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/28873737/an-integrated-strategy-to-discover-lactobacillus-casei-group-strains-for-their-potential-use-as-aromatic-starters
#16
Elena Bancalari, Maria Luisa Savo Sardaro, Alessia Levante, Angela Marseglia, Augusta Caligiani, Camilla Lazzi, Erasmo Neviani, Monica Gatti
Lactic acid bacteria are commonly used in dairy industries to acidify milk and to enhance the flavour of the end products thanks to their metabolisms. The formation routes of aroma compounds mainly rely on the specific ability of different species and strains to convert precursors derived from carbohydrate and amino acids catabolism. It is well known that the strains largely involved in the aroma formation of the very appreciated Italian long ripened cheeses belong to the Lactobacillus casei group and origin from raw milk...
October 2017: Food Research International
https://www.readbyqxmd.com/read/28873396/a-mouse-mastitis-model-to-study-the-effects-of-the-intramammary-infusion-of-a-food-grade-lactococcus-lactis-strain
#17
Cristina Camperio, Federica Armas, Elena Biasibetti, Paolo Frassanito, Carlo Giovannelli, Liliana Spuria, Claudia D'Agostino, Sabrina Tait, Maria Teresa Capucchio, Cinzia Marianelli
Lactococcus lactis is one of the most important microorganisms in the dairy industry and has "generally recognized as safe" (GRAS) status. L. lactis belongs to the group of lactic acid bacteria (LAB) and is encountered in a wide range of environments. Recently, the use of the intramammary infusion of a live culture of LAB has been investigated as a new antibiotic alternative for treating mastitis in dairy ruminants. Controversial results are described in literature regarding its efficacy and safety. In this study we conducted in-depth investigation of the mammary gland immune response induced by intramammary inoculum of a live culture of L...
2017: PloS One
https://www.readbyqxmd.com/read/28865230/withdrawal-of-cefoperazone-with-milk-after-intramammary-administration-in-dairy-cows-prospective-and-retrospective-analysis
#18
A Burmańczuk, T Grabowski, T Błądek, C Kowalski, P Dębiak
The aim of the study was to carry out retrospective and prospective comparative analyses of the pharmacokinetics of CEF after single intramammary (IMM) administration in cows. The prospective study (study A) was conducted on 9 dairy cows of the Polish Black-White race with clinical mastitis during the lactation period. Milk samples were collected at 2, 4, 6, 8, 10, 24, 36, 48, 72 and 84 h after single IMM administration of 250 mg of CEF to one quarter. Drug concentrations in milk samples were determined by HPLC-MS/MS technique and the results of the pharmacokinetic analysis were compared to those obtained in previous studies based on the microbiological (study B) and HPLC-UV methods (study C and D)...
March 1, 2017: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/28831961/efficient-milking-hygiene-reduces-bacterial-spore-contamination-in-milk
#19
Luciana Bava, Stefania Colombini, Maddalena Zucali, Marilù Decimo, Stefano Morandi, Tiziana Silvetti, Milena Brasca, Alberto Tamburini, G Matteo Crovetto, Anna Sandrucci
Clostridia in the milk can lead to late blowing, a cheese defect. Clostridia are ubiquitous, deriving from both the farm environment and the feed ingested by the cows, and are transferred into the milk through faecal contamination. Our aim was to investigate the effect of different in-parlour practices on the content of anaerobic spore-forming bacteria in milk, and to monitor the variation in spore content in the feed and environment. The experiment, conducted in an experimental dairy during autumn, was repeated in exactly the same way for two consecutive years...
August 2017: Journal of Dairy Research
https://www.readbyqxmd.com/read/28803018/short-communication-molecular-characteristics-antimicrobial-susceptibility-and-pathogenicity-of-clinical-nocardia-cyriacigeorgica-isolates-from-an-outbreak-of-bovine-mastitis
#20
Wei Chen, Yongxia Liu, Herman W Barkema, Jian Gao, Jeroen De Buck, John P Kastelic, Gang Liu, Tariq Ali, Muhammad Shahid, Bo Han
The occurrence of nocardial mastitis, mostly in the context of outbreaks, has been reported in many countries. However, there is a paucity of reports regarding detailed characterization of Nocardia cyriacigeorgica from bovine mastitis. Thus, herein we report characteristics, antimicrobial susceptibility patterns, molecular identification, and pathogenicity of N. cyriacigeorgica isolated from an outbreak of clinical mastitis in a dairy herd in northern China. A total of 182 (80.2%) lactating cows had clinical mastitis with severe inflammation and firmness of the udder, reduced milk production, and anorexia, with no apparent clinical response to common antibiotics...
August 9, 2017: Journal of Dairy Science
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