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EFFECTS OF OZONE, CHLORINE DIOXIDE, CHLORINE, AND MONOCHLORAMINE ON CRYTOSPORIDIUM PARVUM OOCYST VIABILITY
Citation:
Korich, D. G., J. R. Mead, M. S. Madore, N. A. Sinclair, AND C. R. Sterling. EFFECTS OF OZONE, CHLORINE DIOXIDE, CHLORINE, AND MONOCHLORAMINE ON CRYTOSPORIDIUM PARVUM OOCYST VIABILITY. APPLIED AND ENVIRONMENTAL MICROBIOLOGY. American Society for Microbiology, Washington, DC, 56(5):1423-1428, (1990).
Impact/Purpose:
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Description:
Purified Cryptosporiodium parvum oocysts were exposed to ozone, chlorine dioxide, chlorine, and monochloramine. Excystation and mouse infectivity were compareatively 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 approvimately 90 min for 90% inactivation. The data indicate that C. parvum oocysts are 30 time smore resistant to ozone and 14 times more resistant to chlorine dioxidxe that Giardia cysts exposed to these disinfectants undere trhe same cxonditions. With the possible exception of ozone, the usew of disinfectants alone should not be expected to inactivate C. parvum oocysts in drinking water.
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EFFECTS OF OZONE, CHLORINE DIOXIDE, CHLORINE, AND MONOCHLORAMINE ON CRYTOSPORIDIUM PARVUM OOCYST VIABILITY