Comparison of Giardia lamblia and Giardia muris cyst inactivation by
Department of Civil Engineering, University of
Alberta, Edmonton, Canada.
Inactivation of Giardia lamblia and Giardia muris
cysts was compared by using an ozone demand-free 0.05 M phosphate buffer
in bench-scale batch reactors at 22 degrees C. Ozone was added to each
trial from a concentrated stock solution for contact times of 2 and 5
min. The viability of the control and treated cysts was evaluated by
using the C3H/HeN mouse and Mongolian gerbil models for G. muris and G.
lamblia, respectively. The resistance of G. lamblia to ozone was not
significantly different from that of G. muris under the study
conditions, contrary to previously reported data that suggested G.
lamblia was significantly more sensitive to ozone than G. muris was. The
simple Ct value for 2 log unit inactivation of G. lamblia was 2.4 times
higher than the Ct value recommended by the Surface Water Treatment
PMID: 8285675 [PubMed - indexed for MEDLINE]