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  • Title: Efficacy of a proprietary formulation of fipronil/(S)-methoprene/cyphenothrin against Ixodes scapularis tick infestations on dogs.
    Author: Carithers D, Everett WR, Gross SJ, Solanki R.
    Journal: Parasit Vectors; 2015 Jul 17; 8():379. PubMed ID: 26182973.
    Abstract:
    BACKGROUND: Efficacy of FRONTLINE TRITAK For Dogs (fipronil/(S)-methoprene/cyphenothrin, Merial, Inc., Duluth, GA) against Ixodes scapularis was evaluated in two separate, but concurrent laboratory studies. METHODS: One day after topical treatment with placebo or active, dogs (n = 24) were infested with 50 unfed adult Ixodes scapularis ticks, with repeat infestations on Days 7, 14, 21 and 28. The number of live ticks was counted at 6 hours post-infestation in the first study (n = 12) and at 24 hours post-infestation in the second study (n = 12). RESULTS: Observed efficacies in study 1 were 93-99% at 6 hour assessments on Day 1 through Day 28 and in the second study, 98-100% at 24 hour assessments, occurring on Day 2 through Day 29. CONCLUSIONS: A single dose of FRONTLINE TRITAK For Dogs (fipronil/(S)-methoprene/cyphenothrin) (0.67 ml or 1.34 ml) prevented the establishment of a new infestation following treatment, as well as the repeated weekly re-infestations with Ixodes scapularis ticks, for 4 weeks.
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