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[目的 ]探讨基本消灭丝虫病地区残存中等密度和较高密度微丝蚴血症者持续时间及传播丝虫病的作用。 [方法 ]应用常规厚血膜法对残存微丝蚴血症进行追踪观察和定期对全民进行普查 ,在流行季节解剖致倦库蚊观察幼丝虫的感染率和感染度 ,以及应用 IFAT进行人群抗丝虫抗体水平测定。 [结果 ]2例中等密度和较高密度微丝蚴血症者持续时间长达 12年以上。致倦库蚊幼丝虫自然感染率及感染度呈逐年下降趋势 ,于第 16年的人群血检中发现 1例丝虫新感染者。 [结论 ]残存中等密度和较高密度班氏微丝蚴血症持续时间可超过 12年。基本消灭丝虫病地区个别残存中等密度和较高密度微丝蚴血症者仍具有传播丝虫病的作用
[Objective] To investigate the duration of filariasis and the transmission of filariasis in the remaining moderate and high-density microfilaremia in areas where filariasis was basically eliminated. [Method] The conventional thick membrane method was used to observe the residual microfilaremia and to carry out general survey on a regular basis to dissect the infection rate and infectivity of young mosquito filari in Culex pipiens pallens in the epidemic season, as well as IFAT population Anti-filarial antibody levels determination. [Results] 2 cases of middle-density and high-density microfilaremia persisted for more than 12 years. The natural infection rate and the infection degree of Culex pipiens quinquefasciatus were declining year by year. One case of newly infected filariasis was found in the blood test of the 16th year. [Conclusion] The duration of remaining medium and high density Bancrofti microfilariae may exceed 12 years. The basic elimination of filariasis endemic filariasis of individual remnants of medium-density and high-density microfilaremia who still have the role of transmission of filariasis