本文用防疟三号进行三个月防疟现场观察,采用双盲法配对观察间日疟流行区人群2482对。结果:服药组发病1例,发疟率为0.406‰;对照组发病19例,发疟率7.717％,保护比为1∶19。另从1053对观察中发现副反应为:头昏、头痛、恶心、呕吐、嘈杂感、乏力、颜面麻木和嗜睡等症状,均在24小时内消失。实践证明该药预防间日疟效果理想,毒性小,较为安全。 In this paper, anti-malarial three months on-site observation of anti-malaria, double-blind pair of observed anti-malaria epidemic area crowd of 2482 pairs. Results: In the medication group, one case developed and the incidence of malaria was 0.406 ‰. In the control group, 19 cases were found, the incidence of malaria was 7.717% and the protection ratio was 1:19. The other from 1053 observed in the side effects were found to be: dizziness, headache, nausea, vomiting, noisy, fatigue, numbness and lethargy and other symptoms, are disappearing within 24 hours. Practice shows that the drug vaporariorum prevention effect is ideal, less toxic, more secure.