【摘要】 本文报道了正安县石井乡及德江县尤盘村基本消灭班氏丝虫病后不再采取防治措施,连续5年及间隔10年纵向监测的结果。石井乡人群微丝蚴率由1980年的0.15％降至1981年0.07％、1983年0.04％及1985年0.05％,阳性者120mm~3血平均微丝蚴密度分别为6.5、11.5及3.5条,5年内未发现新感染病人;IFAT阳性率逐年下降;龙盘村人群微丝蚴率由1975年0.8％降至1985年0.48％,但尚存在较高密度微丝蚴病人,蚊媒阳性率较高,并发现Ⅲ期幼虫,血检亦查出1例新病人,IFAT阳性率高达23.5％,证明丝虫病仍在蔓延。分析认为,人群微丝蚴率及微丝蚴密度是影响丝虫病传播的重要因素,对于已达到基本消灭丝虫病的地区,人群微丝蚴率降至0.5％时,不宜再采取大规模查治措施,而应着重抓好薄弱环节的监测工作.更多还原

【Abstract】 A longitudinal surveillance was carried out in Shijing Township, Zhengan County and Longpan Village, Dejiang County, where bancroftian filariasis had been virtually eradicated and control measures no longer adopted.The results indicated that the microfilaria rate (MR) in Shijing Township was further reduced from 0.15% in 1980 to 0.07, 0.04 and 0.05% in 1981, 1983 and 1985, the average Mf density in positive persons was 6.5, 11.5 and 3.5/120mm3 respectively. Since 1981, no new infections were found. The positive rate of IFAT was reduced from 8.9% in 1980 to 3.1 and 1.2% respectively after 3 and 5 years. From 1982-1985, annual dissection of Culex pipiens fatigans failed to find filaria larval infection. These results suggest that filariasis transmission in this area has been interrupted (Table 1).Concurrently another follow-up observation on the filariasis control was conducted in Longpan Village where microfilarial rate has dropped from 0.8% in 1975 to 0.48% in 1985, but due to the presence of a case with high microfilaremia density (72/120 mm3), the natural infection rate of vector mosquitoes collected from this household was as high as 20.6%, bearing with infective larvae. Blood examination discovered one new patient. The positive rate of IF AT was 23.5%. These findings showed that the tran-smission of filariasis in this area is continuing.The authors deemed that when MR was reduced to below 0.5% in an area, control measures might be omitted while surveillance should be strengthened.更多还原