giardiasis賈第蟲病、梨形鞭毛蟲病學術名詞梨形鞭毛蟲症：獸醫學、實驗動物及比較醫學英文釋義infection of the intestines with protozoa found in contaminated food and water; characterized by diarrhea and nausea and flatulence and abdominal discomfort