*Few insecticides will kill lice eggs on the animal
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*'''Two treatments''' are needed to kill nymphs emerging from eggs at the time of the initial treatment and those that will emerge 2-3 weeks later
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**At '''two week intervals'''
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**Or a product with a '''two week residual activity''' can be used
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*Sucking lice are more susceptible to systemic insecticide treatment than chewing lice
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*Resistance to insecticides may become a problem so alternating the chemicals used and avoiding pour on treatments (which have a greater risk of resistance developing) should be considered