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We recovered Giardia cysts from sewage and estimated the prevalence of giardiasis among inhabitants in Hyogo Prefecture, western Japan. Two 200-ml sewage samples were collected once a month from two different sewage plants (A and B) during a one-year period. After pretreating the samples by filtration and centrifugation in the presence of alcohol and diethyl ether, an immunomagnetic separation method was applied to isolate Giardia cysts. The mean number of cysts recovered from plants A and B were 880/L and 2,000/L, respectively. Circadian rhythms in the number of cysts detected on each of two examination days were observed with a peak at 10:00 a.m., and seasonal variations in cyst numbers were also observed with two peaks in May and December. By using the data obtained from this survey, we estimated that the prevalence of Giardia infection in habitants in the areas serv- iced by plants A and B were 0.1-1.1 and 0.1-1.3%, respectively.

Detection of Giardia cysts in sewage and estimations of giardiasis prevalence among inhabitants in Hyogo Prefecture, Japan