湖北省疟疾高发区媒介按蚊对杀虫剂敏感性的监测

目的 了解采取不同灭蚊措施后，嗜人按蚊和中华按蚊对溴氰菊酯和ＤＤ物敏感性。方法 采用ＷＨＯ成蚊滤纸接触法，观察蚊虫死亡率。结果 省氰菊酯浸帐灭蚊１年、３年和ＤＤＴ滞喷酒灭蚊３年的地区，嗜人按蚊对溴氰菊酯区分剂量死亡率分别为８３．８％，８３．７％和６４．７％，为初步抗性群体，ＬＴ６０分别为８．６９，７．４８和９．８７ｍｉｎ，中华按蚊对溴氰菊酯区分剂量死亡率分别为７６．５％，５７．０％和７９．０％，为

SURVEY OF SUSCEPTIBILITY OF ANOPHELINE VECTORS TO INSECTICIDES IN A MALARIA MESOENDEMIC AREA, HUBEI PROVINCE

Objective] To determine the susceptibility of Anopheles anthropophagus and Anopheles sinensis to deltamethrin and DDT in an area where different counter measures had been adoped. [Methods] The mortality of the vectors was examined by using the standardised WHO test. [Results] The mortality for tentative diagnostic dose in An.anthropophagus to deltamethrin were 83 8%, 83 7% and 84 7%, respectively in the areas where impregnated net had been used for 1 year or 3 years and DDT residual spraying had been carried out for 3 years, suggesting that An. anthropophagus was an initially resistant group. The LT 50 were 8 69, 7 48 and 9 87 min, respectively. The mortality for tentative diagnostic dose in An.sinensis to deltamethrin and DDT were 76 5 %, 57 0% and 79 0%, respectively in three survey areas, suggesting that An. sinensis was a resistant group. The LT 50 were 12 0, 15 4 and 11 2 min, respectively. The mortality for tentative diagnostic dose in An.sinensis to DDT was 95 8% in impregnated net area, suggesting that An. anthropophagus was an initially resistant group. The LC 50 was 0 73%. The mortality for tentative diagnostic dose in An.sinensis to DDT was 44%, suggesting that An. sinensis was a highly resistant group. The LC 50 was more than 4%. [Conclusion] A substantial use of insecticides in the rice paddy field has resulted in resistance of An. sinensis , whereas no apparent resistance of An.anthropophgus has been found.