Effects of ozone, chlorine dioxide, chlorine, and monochloramine on Cryptosporidium parvum oocyst viability.
Reads0
Chats0
TLDR
The data indicate that C. parvum oocysts are 30 times moreresistant to ozone and 14 times more resistant to chlorine dioxide than Giardia cysts exposed to these disinfectants under the same conditions.Abstract:
Purified Cryptosporidium parvum oocysts were exposed to ozone, chlorine dioxide, chlorine, and monochloramine. Excystation and mouse infectivity were comparatively evaluated to assess oocyst viability. Ozone and chlorine dioxide more effectively inactivated oocysts than chlorine and monochloramine did. Greater than 90% inactivation as measured by infectivity was achieved by treating oocysts with 1 ppm of ozone (1 mg/liter) for 5 min. Exposure to 1.3 ppm of chlorine dioxide yielded 90% inactivation after 1 h, while 80 ppm of chlorine and 80 ppm of monochloramine required approximately 90 min for 90% inactivation. The data indicate that C. parvum oocysts are 30 times more resistant to ozone and 14 times more resistant to chlorine dioxide than Giardia cysts exposed to these disinfectants under the same conditions. With the possible exception of ozone, the use of disinfectants alone should not be expected to inactivate C. parvum oocysts in drinking water.read more
Citations
More filters
Book ChapterDOI
Foodborne Animal Parasites
James M. Jay,James M. Jay +1 more
TL;DR: The animal parasites that can be contracted by eating certain foods belong to three distinct groups: protozoa, flatworms, and roundworms.
Dissertation
Detection and Quantification of Cryptosporidium parvum in Natural Soil Matrices and Leachates Using qPCR
TL;DR: Oocyst age was found to be the most critical parameter affecting the oocyst disruption and it was finding to be less dependent when oocysts were disrupted in TE than in Chelex-100 buffer, which provided very specific and sensitive detections of C. parvum in natural soil matrices and leachates.
Dissertation
Surface Enhanced Raman Spectroscopy as a Tool for Waterborne Pathogen Testing
TL;DR: In this paper, surface enhanced Raman spectroscopy (SERS) was used in a sensitive multiplex pathogen detection method for waterborne pathogen identification, which was shown to be effective in detecting G. lamblia and C. parvum.
Dissertation
Improving the Environmental and Economic Sustainability of Dairy Farming using Value-Added Products derived from the Anaerobic Digestion of Manure
TL;DR: In this article, an on-farm anaerobic digester (AD) at a Virginia dairy was used to evaluate how manure-derived value-added products via AD impact the environment and economics of dairy farming.
Urban groundwater contamination by Cryptosporidium oocysts in Haiti : analysis of risk factors for human health
TL;DR: Results indicate that water resources in Haiti are widely contaminated with Cryptosporidium oocysts, which may constitute potential sources of biological risk particularly for human health.
References
More filters
Book
Standard methods for the examination of water and wastewater
TL;DR: The most widely read reference in the water industry, Water Industry Reference as discussed by the authors, is a comprehensive reference tool for water analysis methods that covers all aspects of USEPA-approved water analysis.
Journal ArticleDOI
Determination of ozone in water by the indigo method
TL;DR: In this article, the decolorization of indigo trisulfonate (600 nm, pH below 4) was used to determine the concentration of aqueous ozone in the range 0.005 −30 mg 1−1.
Journal ArticleDOI
Acute enterocolitis in a human being infected with the protozoan Cryptosporidium.
TL;DR: It is suggested, on the basis of the severity of the clinical symptoms, and on the pathological changes in the rectum, that the organism in this case is likely to have been the cause of the enterocolitis and thus to have was a pathogen rather than a commensal.
Journal ArticleDOI
Isolation of Cryptosporidium oocysts and sporozoites using discontinuous sucrose and isopycnic Percoll gradients.
TL;DR: Techniques for the large-scale isolation of Cryptosporidium oocysts and sporozoites, obtained from the feces of experimentally infected Holstein calves, were developed employing discontinuous sucrose gradients and isopycnic Percoll gradients.
Journal ArticleDOI
Large Community Outbreak of Cryptosporidiosis Due to Contamination of a Filtered Public Water Supply
Edward B. Hayes,Thomas Matte,Thomas R. O'Brien,Thomas W. McKinley,Gary S. Logsdon,Joan B. Rose,Beth L. P. Ungar,David M. Word,Margaret A. Wilson,Earl G. Long,Eugene S. Hurwitz,Dennis D. Juranek +11 more
TL;DR: Current standards for the treatment of public water supplies may not prevent the contamination of drinking water by Cryptosporidium, with consequent outbreaks of cryptosporidiosis, it is concluded.