Rupes V, Ledvinka J, Chmela J, Pinterová J
Folia Parasitol (Praha). 1984;31(2):169-75.
For testing the susceptibility of the head louse to insecticides impregnated bunches of polyamide fibres, whose diameter resembled that of human hair (0.1 mm) were used. In this manner a low mortality of control lice collected from infected persons was obtained (2.9% after 16 hours of exposure). Even after 25 years of DDT use no apparent resistance could be demonstrated in 25 tested louse populations and cross resistance to permethrin in 7 tested populations. The diagnostic concentration for resistance to pp'-DDT was established at 1%. Of the tested insecticides the highest toxicity was shown by malathion (LC50 = 0.000 018%), pirimiphos-methyl had on average a twice lower toxicity, trichlorphon 104 times lower, tetramethrin 1220 times lower, permethrin 2.5 times lower and pp'-DDT 630 times lower toxicity.
为测试头虱对浸渍了杀虫剂的聚酰胺纤维束的敏感性，使用了直径与人发相似（0.1毫米）的纤维束。通过这种方式，从感染者身上收集的对照虱子死亡率较低（暴露16小时后为2.9%）。即使在使用滴滴涕25年后，在25个测试虱子种群中也未显示出明显抗性，在7个测试种群中也未发现对氯菊酯的交叉抗性。对pp'-滴滴涕抗性的诊断浓度确定为1%。在所测试的杀虫剂中，马拉硫磷毒性最高（LC50 = 0.000 018%），甲基嘧啶磷平均毒性低两倍，敌百虫低104倍，胺菊酯低1220倍，氯菊酯低2.5倍，pp'-滴滴涕低630倍。
