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The rapid speed of kill of a spot-on, combination of fipronil-permethrin (Effitix®, Virbac) was shown against infestations of Rhipicephalus sanguineus and Ctenocephalides felis on dogs. Efficacy was determined against new infestations at weekly intervals for one month after treatment.Dogs were allocated randomly to either an untreated control or to a single administration, given on Day 0, of either...
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