The root of the problem is what Dr Kaplan refers to as global worming -giving drugsprophylactically to all livestock rather than reserving them for use as a treatment when ananimal actually becomes infested. It is common sense, of course, to try to preventinfestation rather than merely treating it once it has arisen.
问题的根源是卡普兰博士称为 全球防虫 的现象预防性地对所有家畜用药,而不是在动物身上真正出现了寄生虫时投药治疗。当然,防病胜于治病是常识。
Unfortunately, such promiscuous use of drugs is the best way to put selection pressure onthe worms and encourage the evolution of resistant strains.
不幸的是,这样的预防性用药是在寄生虫身上施加选择压力的最佳方法,能够促进抗药品种的进化。
What is needed, says Dr Kaplan, is more selective drug use, and better management.Worms are not evenly distributed. Instead, a minority of animals play host to most of them.Aiming treatment at those animals would reduce the likelihood of resistance emergingwithout harming a farmer s ability to control infestations. Better husbandry might help, too.Not grazing so many animals on a given patch of land would discourage transmission.
卡普兰博士认为,现在需要做的是加强管理与更有选择性地用药。寄生虫并非均匀寄生在各种动物身上。有少数动物是大多数寄生虫的寄主。集中治疗这些动物则会降低耐药性发生的可能性,同时也不会损害农民控制虫害的能力。改进饲养方法或许也有益处。不在一块草地上过量放牧动物会减轻虫害传播。
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