Morcombe P W, Young G E
Department of Agriculture, South Perth, Western Australia.
Aust Vet J. 1993 Apr;70(4):147-50. doi: 10.1111/j.1751-0813.1993.tb06110.x.
Lice were found in samples of baled wool from 198 of 464 flocks treated to eliminate an infestation in the period July 1988 to June 1990. In 287 flocks the insecticide was applied as a backline treatment and in 177 flocks a shower dip was used. Of these flocks, 41.5% and 44.6%, respectively, were found to be infested at the following shearing. After adjusting for the accuracy of the test, it was estimated that infestation in 2 consecutive 12-month periods occurred in 52.6% of flocks with a real incidence rate of 27.4%. Using these estimates, it was calculated that in 34.7% of infested flocks treatment did not kill all lice. There were no differences in the proportion of consecutive infestations between flocks treated with any of the 3 chemicals applied as backline treatments. Among flocks treated in a shower dip, 68.4% using coumaphos, 37.8% using diazinon and 41.5% using cyhalothrin had consecutive infestations (P < 0.05). The detection of lice in 63.2% of flocks that were treated with magnesium fluosilicate was, in part, attributed to the application of this chemical by one operator.
在1988年7月至1990年6月期间为消除感染而接受处理的464个羊群的打包羊毛样本中发现了虱子。在287个羊群中，杀虫剂作为背部处理剂使用，在177个羊群中使用了喷淋浸浴法。在这些羊群中，分别有41.5%和44.6%在随后的剪毛时被发现有感染。在对检测准确性进行调整后，估计在连续两个12个月期间，52.6%的羊群发生感染，实际发生率为27.4%。根据这些估计，计算得出在34.7%的受感染羊群中，处理未能杀死所有虱子。在作为背部处理剂使用的三种化学药品中，使用任何一种药品处理的羊群之间，连续感染的比例没有差异。在采用喷淋浸浴法处理的羊群中，使用蝇毒磷的羊群有68.4%、使用二嗪农的羊群有37.8%、使用氯氟氰菊酯的羊群有41.5%出现连续感染（P<0.05）。在用氟硅酸镁处理的63.2%的羊群中发现了虱子，部分原因是该化学品由一名操作人员施用。
