When broken down by size of farm and found that the prevalence of small farms have been contaminated with parasites, most 42.86% (6/14), followed by 34.78% and medium-sized farms in the water after treatment. Found that the prevalence of small farms have been contaminated with parasites, most 14.29 (2/14) as well as in wastewater before treatment. Large farms, followed by 12.50% (1/8).
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