湖南省丝虫病防治后期监测及流行病学动态分析

湖南省基本消灭丝虫病后１９８７～１９９１年横向监测４６个县（市）的４０８个村，血检２８７８６４人，查出微丝蚴血症者４人，平均微丝蚴率为０．００１％，各年微丝蚴率依次为０．００４％、０．００３％、０、０．００２％和０．００１％。解剖致倦库蚊２６８５２只，仅１９８８年发现阳性蚊１３只；解剖中华按蚊５７７１只，未发现幼丝虫。血清学监测流行区人群平均抗体阳性率为３．７６％，与非流行区抗体水平相近。４个纵向监测点的观察结果表明，低密度微丝蚴血症者能自然转阴。６个县（市）的晚期丝虫病患病率调查结果显示，基本消灭丝虫病后不再出现新的象皮肿病人，鞘膜积液的新发病例显著减少，但仍继续出现新的乳糜尿病人。

ANALYSIS OF SURVEILLANCE RESULTS AND EPIDEMIOLOGIC TRENDS OF FILARIASIS AT LATE STAGE OF THE CONTROL IN HUNAN

Cross-sectional surveillance was carried out in 408 villages of 46 counties in Hu-nan province from 1987 to 1991 where filariasis had been basically eradicated.Of 287 864 resi-dents examined 4 were found positive in microfilaremia. The average microfilaria rate(MFR)was0.001%, with the annual microfilaria rates of 0.004%,0.003%,0,0.002%and 0.001% from1987 to 1991 respectively. Only 13 positive mosquitos were found in 1988 in 26852 Culexquinquefasciatus. No natural filarial infection was found in 5771 Anopheles sinensis. The averagepositive rate of filarial antibodies in the inhabitants living in endemic areas was 3.75%by IFAT.There was no significant difference between the filarial antibody levels of the inhabitants living inthe area and in non-endemic areas. The results of the observation of 4 longitudinal surveillancestations demonstrated that microfilaremia of low density could convert negatively.The investiga-tion result of morbidity rate of advanced filariasis in 6 counties indicated that no new elephantiasiscases occurred after the basic elimination of filariasis. The number of new hydrocele cases reducedgreatly,while new cases of chyluria continued to appear.