Because of its efficacy in inactivating waterborne protozoan cysts and oocysts, ozone is frequently used for disinfection of drinking water. The effect of ozone on cysts of Giardia lamblia was investigated in gerbils (Meriones unguiculatus), using an infectivity assay by scanning electron microscopy, immunoblotting, and flow cytometry. Cysts recovered from experimentally infected gerbils were exposed to an initial ozone concentration of 1.5 mg/L for 0, 30, 60, and 120 sec. This treatment resulted in a dose-dependent reduction in cysts concentration, loss of infectivity in gerbils, and profound structural modifications to the cyst wall. Exposure for 60 sec or longer resulted in extensive protein degradation and in the disappearance of a cyst wall and a trophozoite antigen.
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December 2002
FUNCTIONAL MORPHOLOGY|
December 01 2002
STRUCTURAL AND BIOCHEMICAL ALTERATIONS IN GIARDIA LAMBLIA CYSTS EXPOSED TO OZONE
Giovanni Widmer;
Giovanni Widmer
Tufts University School of Veterinary Medicine, Building 20, 200 Westboro Road, North Grafton, Massachusetts 01536. [email protected]
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Tim Clancy;
Tim Clancy
Tufts University School of Veterinary Medicine, Building 20, 200 Westboro Road, North Grafton, Massachusetts 01536. [email protected]
* Clancy Environmental Consultants, Inc., St. Albans, Vermont 05478
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Honorine D. Ward;
Honorine D. Ward
Tufts University School of Veterinary Medicine, Building 20, 200 Westboro Road, North Grafton, Massachusetts 01536. [email protected]
† Division of Geographic Medicine and Infectious Diseases, New England Medical Center, Tufts University School of Medicine, Boston, Massachusetts 02111
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Dan Miller;
Dan Miller
Tufts University School of Veterinary Medicine, Building 20, 200 Westboro Road, North Grafton, Massachusetts 01536. [email protected]
* Clancy Environmental Consultants, Inc., St. Albans, Vermont 05478
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Glenda M. Batzer;
Glenda M. Batzer
Tufts University School of Veterinary Medicine, Building 20, 200 Westboro Road, North Grafton, Massachusetts 01536. [email protected]
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Christine B. Pearson;
Christine B. Pearson
Tufts University School of Veterinary Medicine, Building 20, 200 Westboro Road, North Grafton, Massachusetts 01536. [email protected]
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Zia Bukhari
Zia Bukhari
Tufts University School of Veterinary Medicine, Building 20, 200 Westboro Road, North Grafton, Massachusetts 01536. [email protected]
* Clancy Environmental Consultants, Inc., St. Albans, Vermont 05478
‡ Present address: American Water Works Service Company, Inc., 1115 South Illinois Street, Belleville, Illinois 62220
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J Parasitol (2002) 88 (6): 1100–1106.
Citation
Giovanni Widmer, Tim Clancy, Honorine D. Ward, Dan Miller, Glenda M. Batzer, Christine B. Pearson, Zia Bukhari; STRUCTURAL AND BIOCHEMICAL ALTERATIONS IN GIARDIA LAMBLIA CYSTS EXPOSED TO OZONE. J Parasitol 1 December 2002; 88 (6): 1100–1106. doi: https://doi.org/10.1645/0022-3395(2002)088[1100:SABAIG]2.0.CO;2
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