为了解人群微丝蚴阳性率降至0.5％以下的马来丝虫病流行区,低密度微丝蚴血症者能否自然转阴,我们于1982至1985年,在达到基本消灭丝虫病指标的浙江省临海市,对11例马来丝虫微丝蚴血症阳性者进行观察,其微丝蚴密度为1～10条/60μ1,平均5.3条。以后每年1次,连续4年晚上9点后定量采血120μl,制作2片厚血膜,经美蓝染色,每片检查2次,结果如下: In order to understand whether the prevalence of microfilaria in the population dropped below 0.5%, the prevalence of microfilaremia in patients with low-density microfilaremia naturally turned negative. From 1982 to 1985, we achieved the basic elimination of filariasis Indicators of Linhai City, Zhejiang Province, 11 cases of microfilaria in malaria filariasis were observed, the microflora density of 1 to 10 / 60μ1, an average of 5.3. After once a year for four consecutive years after 9:00 quantitative blood 120μl, making 2 thick membranes, the United States blue staining, each check 2 times, the results are as follows: