Download or read book Cryptosporidium Parvum Viability Assay written by Miodrag Belosevic and published by American Water Works Association. This book was released on 2000 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advancing Cryptosporidium Parvum Detection Methodologies written by Mark C. Jenkins and published by American Water Works Association. This book was released on 2002 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study focused on ideal methods of detecting C. parvum oocysts which give low detection limits, specific and sensitive detection in concentraded samples, and differentiation of viable from non-viable oocysts; are usable by a water treatment facility and provide quantitative results within a few hours. Potential useful methods are continuous flow centrifugation, rel-time TaqMan PCR, cell culture inoculation followed by PCR of DNA extration, and FISH.

Download or read book Cryptosporidium Viability and Infectivity Methods written by Jennifer L. Clancy and published by American Water Works Association. This book was released on 2000 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cryptosporidium written by Mark S Smith and published by Royal Society of Chemistry. This book was released on 2007-10-31 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cryptosporidium, in its various forms, is a widely recognised cause of outbreaks of waterborne disease. Regulatory bodies worldwide are increasingly requiring the development of "fit-for-purpose" detection methods for this protozoan parasite, but analysis is often problematic. Bringing together international academic and industry-based experts, this book provides a comprehensive review of the current state of analytical techniques for the detection of Cryptosporidium, as well as looking at likely future developments. In particular, the issues of species identification and oocyst viability are addressed. Quality assurance issues and potential problems associated with the new Cryptosporidium regulations are also highlighted. The extent of the perceived problems and the regulatory backdrop against which the analysis must be carried out are also discussed. Scientists in the water industry, environmental testing laboratories, researchers, consultants, environmental health professionals, food manufacturers and regulatory or environmental bodies are amongst the many who should read this book. In addition, anyone with an interest in microbiological challenges and problem-solving will welcome the coverage.

Download or read book Cryptosporidium Parvum Oocysts written by Satomi Kato and published by . This book was released on 2001 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comparing Cell Culture and Mouse Assays for Measuring Infectivity of Cryptosporidium written by Paul A. Rochelle and published by IWA Publishing. This book was released on 2005-06-30 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cell culture techniques are routinely used for measuring the infectivity of a wide range of human pathogens. A variety of different cell culture systems and detection methodologies have been applied to Cryptosporidium parvum. However, the correlation between cell culture methods and animal infectivity assays has not been thoroughly investigated. Although many cell culture methods have been developed for C. parvum, it has not been proven that infectivity in cell culture is a good indicator of the ability of oocysts to cause infections in animals. The objective of this research was to compare in-vitro cell culture methods with a mouse assay for measuring infectivity of C. parvum oocysts. The specific objectives were to (1) compare the dose response and sensitivity of cell culture and mouse assays with multiple isolates; (2) compare infectivity methods with oocysts exposed to environmental water samples; (3) determine the reproducibility and variability of the methods; and (4) compare cell culture and animal assays for assessing ozone and UV disinfection.For untreated oocysts, challenge doses were enumerated by flow cytometry. Dose response curves were constructed by regression analysis of oocyst dose against a logistic transformation of the proportional infectivity and the 50% infectious doses for each isolate were calculated by solving the regression for a logit value of zero. Infections in CD-1 mice were detected by microscopy following staining with hematoxylin and eosin. Infection in HCT-8 and Caco-2 cells was detected by C. parvum-specific RT-PCR. In MDCK cells, infection was detected using immunofluorescence. For disinfection studies, oocysts were exposed to UV using a medium-pressure, collimated beam apparatus and inactivation was measured as the difference in ID50 of unexposed and UV-exposed oocysts. Oocysts were exposed to ozone using batch, semi-batch, and single continuously stirred tank reactors at 1, 5, and 15°C.This investigation demonstrated that in-vitro cell culture was equivalent with a mouse assay for measuring infectivity of untreated C. parvum oocysts and should therefore be considered a practical alternative for assessing the potential of oocysts to cause infection. However, the high levels of variability displayed by mouse and cell culture methods indicated that infectivity and disinfection experiments should be limited to discerning relatively large differences. Of the three cell culture assays, the HCT-8/RT-PCR method displayed the closest agreement with the CD-1 mouse assay. C. hominis was infectious in HCT-8 cells but did not infect mice. Similar results were obtained with CD-1 mice and HCT-8 cells for measuring infectivity of oocysts that had been exposed to environmental water for 35 days. There was also very good agreement between HCT-8 cell culture and CD-1 mouse assays for measuring UV inactivation of C. parvum. A medium-pressure UV dosage of 5.6 mJ/cm2 resulted in 2-log10 inactivation. The shapes of ozone inactivation curves were generally the same for mouse and cell culture derived data although the CD-1 mouse assay typically generated 0.5 to 1-log10 higher levels of inactivation than HCT-8 cells. In addition, there was a stimulatory response in oocysts exposed to ozone below 20 mg.min/L when assayed by HCT-8 cell culture. Consequently, further research is necessary to understand the response of oocysts to ozone when inactivation is assessed by cell culture methods. The water industry should adopt in-vitro cell culture as a routine method for measuring the infectivity of waterborne C. parvum and C. hominis oocysts. This project has demonstrated that cell culture has equivalency with the standard CD-1 mouse assay and cell culture assays can be applied to oocysts recovered from water using approved methods. However, there needs to be a thorough, robust, and well-controlled study to compare the various cell culture-based assays for measuring C. parvum and C. hominis infectivity. This evaluation should include inter-laboratory comparisons and round-robin testing. Cell culture-based assays should also be used to assess disinfection of C. hominis isolates. Originally published by AwwaRF for its subscribers in 2004. This publication can also be purchased and downloaded via Pay Per View on Water Intelligence Online - click on the Pay Per View icon below

Download or read book Vital Dye Staining of Giardia and Cryptosporidium written by Miodrag Belosevic and published by American Water Works Association. This book was released on 1997 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Molecular Mechanisms of Chemical Inactivation of Cryptosporidium Oocysts and Giardia Cysts written by Giovanni Widmer and published by American Water Works Association. This book was released on 2002 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report seeks to characterize, at the molecular level, the effect of water disinfectants on oocysts of Cryptosporidium parvum and on cysts of Giardia lamblia. It presents the results of ozone, chlorine, and ozone/chlorine sequential disinfection. Graphs, charts, and micrographs provide visual re

Download or read book Giardia Cyst and Cryptosporidium Oocyst Survival in Watersheds and Factors Affecting Inactivation written by S. A. Sattar and published by American Water Works Association. This book was released on 1999 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Improved in Vitro Culture of Cryptosporidium parvum written by G. Widmer and published by IWA Publishing. This book was released on 2006-04-30 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this project was to investigate methods, which promote growth of Cryptosporidium (C.) parvum in culture. The researchers tested the assumption that improved survival of host cells enhances growth of C. parvum. Although certain modifications to the culture methodology improved host cell survival, enhancing host cell survival was not always accompanied by an increase in parasite density in the cell monolayer. Some cultures grown on collagen or laminin showed improved parasite growth. However, this effect was not consistent, indicating that other variables affect parasite growth. C. parvum was more prevalent in cells in the mitotic cycle than in non-dividing cells. This is consistent with the absence of certain biosynthetic pathways in C. parvum, and suggests that dividing cells may be more favorable to parasite development. Although current culture methods enable the detection of infectious Cryptosporidium oocysts, limited parasite growth reduces the sensitivity of the assay, making it necessary to apply sophisticated methods for the detection of the intracellular parasites. This study identified methods that slightly improve growth of Cryptosporidium in culture and also highlighted methods that have no effect. This report is available only as a pay-per-view item.

Download or read book Detection of Cryptosporidium Parvum Oocysts in Soil Using the Polymerase Chain Reaction written by Juliet E. Bryant and published by . This book was released on 1995 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cryptosporidium From Molecules to Disease written by R.C.A. Thompson and published by Elsevier. This book was released on 2003-12-17 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the relatively short period since Cryptosporidium was recognised as a human pathogen, and that it could be transmitted in water as well as directly between animals and people, it has been the subject of intense investigations. Its status as an opportunistic pathogen, especially in AIDS patients, and the lack of effective anti-cryptosporidial drugs have served to emphasise the public health importance of this organism. This has to some extent overshadowed the fact that Cryptosporidium is also an important pathogen of domestic animals and wildlife. In recent years, the application of molecular biology and culture techniques have had an enormous impact on our understanding of the aetiological agents of cryptosporidial infections and our ability to study the causative agents in the laboratory. As a consequence, a wealth of information and novel data has been produced during the last 3-4 years, particularly in the areas of taxonomy, biology, pathogenesis, epidemiology - particularly zoonotic and water borne transmission, and treatment. It is thus very timely to bring together in this book the international research community involved to review the major advances in research and identify the important research priorities for the future, thus enabling as wide an audience as possible to benefit from and share in this comprehensive look at Cryptosporidium and cryptosporidiosis.

Download or read book Cryptosporidium written by Jan R. Mead and published by Humana. This book was released on 2019-08-27 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book encompasses broad aspects of Cryptosporidium research with established methods that have been improved and expanded over the years as well as recent cutting-edge techniques. Within this collection are numerous molecular methods as well as protocols for genotyping and diagnostics, while also including room for in vitro cell culture techniques to address the issues with growing this difficult organism continuously. Written for the highly successful Methods in Molecular Biology series, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls. Authoritative and practical, Cryptosporidium: Methods and Protocols serves as an idea guide to the inherent challenges of working with cryptosporidial parasites to provide a foundation for new investigators to build upon. The chapter “Accessing Cryptosporidium Omic and Isolate Data via CryptoDB.org” is available open access under a Creative Commons Attribution 4.0 International License via link.springer.com.

Download or read book Twort s Water Supply written by Malcolm J. Brandt and published by Butterworth-Heinemann. This book was released on 2016-09-03 with total page 932 pages. Available in PDF, EPUB and Kindle. Book excerpt: Twort's Water Supply, Seventh Edition, has been expanded to provide the latest tools and techniques to meet engineering challenges over dwindling natural resources. Approximately 1.1 billion people in rural and peri-urban communities of developing countries do not have access to safe drinking water. The mortality from diarrhea-related diseases amounts to 2.2 million people each year from the consumption of unsafe water. This update reflects the latest WHO, European, UK, and US standards, including the European Water Framework Directive. The book also includes an expansion of waste and sludge disposal, including energy and sustainability, and new chapters on intakes, chemical storage, handling, and sampling. Written for both professionals and students, this book is essential reading for anyone working in water engineering. Features expanded coverage of waste and sludge disposal to include energy use and sustainability Includes a new chapter on intakes Includes a new chapter on chemical storage and handling

Download or read book Surgical Pathology of the GI Tract Liver Biliary Tract and Pancreas written by Robert D. Odze and published by Elsevier Health Sciences. This book was released on 2009-01-01 with total page 1387 pages. Available in PDF, EPUB and Kindle. Book excerpt: This one-of-a-kind reference provides a comprehensive and practical guide to help you interpret endoscopic biopsies and resection specimens of all organs related to the digestive system. Plus, thanks to Expert Consult, you'll be able to access the entire contents of this title online and download all images, from anywhere there's an internet connection. The more than 2250 high quality illustrations, 30% more than in the first edition, help you recognize and diagnose any tissue sample under the microscope. Five new chapters, additional expert authors, expanded tables, and coverage of the current clinical approach to management and treatment options, particularly screening and surveillance recommendations for preneoplastic disorders, round out this unique reference. Acts as a one-stop resource for the entire gastrointestinal system, liver, biliary tract, and pancreas. Incorporates over 2250 high quality color illustrations so you can recognize and diagnose any tissue sample under the microscope. Provides all the necessary tools to make a comprehensive diagnostic workup including data from ancillary techniques and molecular findings whenever appropriate. Simplifies complex topics and streamlines decision-making using extensive tables, graphs, and flowcharts. Helps you avoid diagnostic errors thanks to practical advice on pitfalls in differential diagnosis. Uses a new "road map" at the beginning of each chapter, as well as a new, more clinical focus to help you navigate through the book more quickly. Reflects the latest classification and staging systems available so you can provide the clinician with the most accurate and up-to-date diagnostic and prognostic indicators, including key molecular aspects of tumor pathology. Includes access to the entire contents online, from anywhere there's an internet connection. Adds five new chapters including "Screening and Surveillance of the GI Tract", "Congenital and Developmental Disorders of the GI Tract", "Pediatric Enteropathies of the GI Tract", "Vascular Disorders of the GI Tract", and "Fatty Liver Disease". Expands appropriate chapters with new coverage of the normal histology of the GI tract, liver, biliary tract and pancreas. Uses expanded tables to outline specific differential diagnostic points helpful for surgical pathologists. Discusses the key molecular aspects of tumor progression and risk assessment in all chapters that cover neoplastic disorders. Helps you evaluate diagnostically challenging cases using diagnostic algorithms. Increases the number of high quality photographs by at least 30% to include even more normal and abnormal tissue samples. Updates all chapters to include the latest references, concepts, data, and controversies. Incorporates expanded coverage of the pancreas and liver, eliminating the need for a separate text. Your purchase entitles you to access the web site until the next edition is published, or until the current edition is no longer offered for sale by Elsevier, whichever occurs first. If the next edition is published less than one year after your purchase, you will be entitled to online access for one year from your date of purchase. Elsevier reserves the right to offer a suitable replacement product (such as a downloadable or CD-ROM-based electronic version) should access to the web site be discontinued.

Download or read book Cryptosporidium and Cryptosporidiosis written by Ronald Fayer and published by CRC Press. This book was released on 2007-12-25 with total page 579 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the microscopic observation of infection to the widespread application of molecular techniques in taxonomy and epidemiology, to the genome sequencing of two major species and advances in biochemistry, phylogeny, and water treatment, new information on this fascinating genus continues to mount as we discover and utilize the latest scientific te

Download or read book The New Public Health written by Theodore H. Tulchinsky and published by Academic Press. This book was released on 2014-03-26 with total page 911 pages. Available in PDF, EPUB and Kindle. Book excerpt: The New Public Health has established itself as a solid textbook throughout the world. Translated into 7 languages, this work distinguishes itself from other public health textbooks, which are either highly locally oriented or, if international, lack the specificity of local issues relevant to students' understanding of applied public health in their own setting. This 3e provides a unified approach to public health appropriate for all masters' level students and practitioners—specifically for courses in MPH programs, community health and preventive medicine programs, community health education programs, and community health nursing programs, as well as programs for other medical professionals such as pharmacy, physiotherapy, and other public health courses. Changes in infectious and chronic disease epidemiology including vaccines, health promotion, human resources for health and health technology Lessons from H1N1, pandemic threats, disease eradication, nutritional health Trends of health systems and reforms and consequences of current economic crisis for health Public health law, ethics, scientific d health technology advances and assessment Global Health environment, Millennium Development Goals and international NGOs