自四十年代DDT和六氯苯(666)出现后,疥疮和虱等体外寄生虫病的治疗已取得划时代成就,几乎全部患者用最简便的疗法即可痊愈,疥疮和虱的流行迅速得到控制。但随着这些药物的广泛应用,不但造成污染,而且疥螨、虱和其它昆虫也逐渐产生了抗药性。另外,DDT和γ-666对人体的有害作 Since the advent of DDT and hexachlorobenzene (666) in the 1940s, the treatment of ectoparasitic diseases such as scabies and lice has taken a landmark, and almost all patients are cured by the most simple therapies and the prevalence of scabies and lice is rapidly being controlled . However, with the widespread use of these drugs, it not only causes pollution, but also scabies, lice and other insects have gradually developed resistance. In addition, DDT and γ-666 harmful to the human body