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在菲律宾保和省,用环卵沉淀试验(COP)对日本血吸虫病进行纵向调查,1981～85年该地区6个流行村初步调查发现,San Vicente和Sto.Tomas两村的COP阳性率最高,因而被选为随访区。
A longitudinal survey of schistosomiasis japonica was carried out in the Hohhot in the Philippines using the ring-egg test (COP). From 1981 to 1985, a preliminary survey in six endemic villages in the area found that the highest positive rates of COP were found in the two villages of San Vicente and St. Tomas, It was chosen as follow-up area.