| longitudinal studies of giardia contamination in two community drinking water supplies: cyst levels, parasite viability, and health impact. | giardia cyst concentrations were determined in an inventory of 153 raw and 91 chlorinated drinking water samples collected at 86 sites from throughout the western canadian province of british columbia. sixty-four percent of raw water samples were cyst positive (69% of sites). cyst concentrations were lower in chlorinated than in raw water. the viability of cysts in drinking water samples assessed by infectivity in mongolian gerbils (meriones unguiculatus) was decreased in chlorinated water. two ... | 1996 | 8572711 |
| evaluation of molecular techniques to biotype giardia duodenalis collected during an outbreak. | twenty-seven giardia duodenalis cyst-positive specimens (human, animal, or drinking water) were obtained from a waterborne outbreak in a community in british columbia, western canada. parasite isolates were characterized using molecular techniques at 4 different steps of organism retrieval. none of the drinking water samples (n = 20) infected gerbils and none was successfully amplified using polymerase chain reaction (pcr). we were able to genotype 4 of 7 (human and animal) isolates by amplifica ... | 2000 | 10701587 |