丝虫生育力的持续时间和造成疾病传播所需的最低微丝蚴密度是防治丝虫病中极为重要的二个流行病学因素。本文报告2例观察的结果,以说明此问题。例1,患者女性,欧洲后裔的塔希堤人,生于1900年,患者在18岁时右腿第一次出现急性淋巴管炎,一年以后累及到左下肢发作,随后急性发作大约每二年一次,直至35岁患者离开波利尼西亚去法国才停止。从1935～1975年患者逗留在法国,1937年她仅到吉布堤旅行8个月,1975年7月5日返回 The duration of filarial fertility and the minimum microfilariae density necessary for disease transmission are two of the most important epidemiological factors in controlling filariasis. This article reports the results of two observations to illustrate this issue. Example 1 Patient Female, European-born Tahiti, was born in 1900. The patient developed acute lymphangitis at the age of 18 for the first time in his right leg, and a year later involved a left lower extremity attack, followed by an acute attack of about two Once a year, patients stopped leaving Polynesia until they reach the age of 35. From 1935 to 1975, the patient stayed in France and in 1937 she traveled only to Djibouti for eight months, returning on 5 July 1975