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
Dissertation
Élaboration d’un système in vitro de suivi en continu par spectroscopie d’impédance électrique de l’infection d’une lignée de cellules cancéreuses par un protozoaire parasite : Cryptosporidium parvum
TL;DR: In this article, a spectroscopie dimpedance electrique is used to quantify the infectivite d le Cryptosporidium parvum infectant des cultures cellulaires and quantifier l'infectivite of un inoculum.
Journal ArticleDOI
The efficiency of ozonated water from a water treatment plant to inactivate Cryptosporidium oocysts during two seasonal temperatures
TL;DR: The efficiency of residual ozone from an advanced water treatment plant with an applied dose of 2.5 mg l(-1) to inactivate viable Cryptosporidium oocysts during summer (i.e. 24 degrees C) and winter in Queensland, Australia is investigated.
Dissertation
Microbial status of irrigation water for vegetables as affected by cultural practices
TL;DR: In this article, a pre-harvest cultural practices to reduce pathogen load, including cessation of irrigation with contaminated water three days before harvest and decreasing the water regime of the growing medium for leafy vegetables, were assessed.
DissertationDOI
Infection at the wildlife-livestock-human interface : three systems
TL;DR: Acknowledgements and Declaration of authorship are given in this paper, along with a list of tables and figures of figures of the authors and the authors' work. But they do not specify the authorship of these tables.
Journal ArticleDOI
Low Incidence of Concurrent Enteric Infection Associated with Sporadic and Outbreak-Related Human Cryptosporidiosis in Northern Ireland
John E. Moore,Lester Crothers,B. Cherie Millar,Elizabeth Crothers,Paul J. Rooney,Lihua Xiao,James S. G. Dooley,Colm J. Lowery +7 more
TL;DR: A significantly higher incidence of cryptosporidiosis is demonstrated in rural areas than urban areas and the south of England than in Midlands the mixed enteric infections in the developed world, where an additional enteric pathogen has been isolated along with Cryptosporidium parvum.
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.