Martin P J
Pitman-Moore Australia Limited, Birling Research and Development Station, Bringelly, New South Wales.
Aust Vet J. 1993 Jun;70(6):209-11. doi: 10.1111/j.1751-0813.1993.tb03305.x.
A field strain of the sheep body louse, Bovicola (Damalinia) ovis, was tested in vitro against a range of synthetic pyrethroids (SP) and demonstrated a degree of resistance 80 to 900 times that of a susceptible strain. The dose response of this strain was compared with that of other strains showing low and intermediate resistance. These data, and those from other reported cases suggest that SP resistance in sheep lice develops sequentially through a low level stage with resistance factors of 20 or less. Further selection results in the development of strains with resistance factors of up to several hundred. The implication is that preventing or managing resistance requires proper lice control management including choosing a chemical capable of eradicating lice populations.
对绵羊体虱（牛虱属（达氏虱属）绵羊虱）的一个野外菌株进行了一系列合成拟除虫菊酯（SP）的体外测试，结果表明其抗性程度是敏感菌株的80至900倍。将该菌株的剂量反应与其他显示低抗性和中等抗性的菌株进行了比较。这些数据以及其他报道病例的数据表明，绵羊虱对SP的抗性是通过抗性因子为20或更低的低水平阶段依次发展而来的。进一步的选择导致产生抗性因子高达数百的菌株。这意味着预防或管理抗性需要适当的虱子控制管理，包括选择一种能够根除虱子种群的化学品。
