前言世界卫生组织(WHO)通过她的6个地区办事处,通过国家规划,并通过各种研究、发展和促进健康的计划,尽力帮助所属165个成员国提高人民的健康水平。她既帮助发达国家,也帮助发展中的国家。在她所从事的各项工作中,最大的挑战也许是帮助成员国有效地防治传染病,其中最为重要的是虫 Foreword Through its six regional offices, through its national programs and through various research, development and promotion health programs, the World Health Organization (WHO) tries its best to help its 165 Member States to improve their health. She helps both developed and developing countries. Among the various tasks she is engaged in, the biggest challenge may be to help members effectively control infectious diseases, the most important of which are insects