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１９８６～１９９０年在基本达到消灭丝虫病的广东省乳源县红星村进行调查。该村防治前人群微丝蚴率为１１．８５％，全民服用海群生盐６个月进行防治，三年后连续５年观察，人群微丝蚴率降至０．２３～１．５％，１４例残存微丝蚴血症者逐年转阴，至１９９０年仅存２例，未发现新感染者，致倦库蚊自然感染率为０．７３％、０．０８％、０、０、０。未发现感染期幼虫。居民一年内受感染性蚊叮咬数１９８８～１９９０年均为０。推断不会再有新病例发现，说明已阻断班氏丝虫病传播。
From 1986 to 1990, Hongxing Village, Ruyuan County, Guangdong Province, which basically eliminated filariasis, was investigated. Before the prevention and treatment of the village microfilaria rate of 11.85%, the whole population taking sea salt 6 months for prevention and treatment, three years after the observation for 5 years, the crowd microfilaria rate dropped to 0.23 to 1.5% Fourteen cases of residual microfilaremia turned negative each year, and only 2 cases were found in 1990. No new infections were found. The natural infection rates of Culex quinquefasciatus were 0.73%, 0.08%, 0,0,0 . No infection larvae were found. Residents inhaled mosquito bites in a few years from 1988 to 1990 were 0. It is inferred that no more new cases will be found, indicating that the transmission of Bancroftian filariasis has been blocked.