Abstract
This randomised controlled laboratory study demonstrated the residual speed of efficacy of an imidacloprid/flumethrin collar (Seresto®, Bayer) for the control of ticks (Dermacentor variabilis, Amblyomma americanum) at 6 and 12 hours postinfestation on dogs when compared to oral afoxolaner (NexGard®, Merial). Dogs were randomised by pre-treatment tick counts: Group 1) imidacloprid 10 % (w/w) / flumethrin 4.5 % (w/w) collar, 2) afoxolaner chewable (dosage 3.1 – 6.2 mg/kg), and 3) non-treated controls. Ticks (50/species/dog) were infested on days 3, 14, 21, and 28; live (attached and non-attached) and dead attached ticks were counted 6 and 12 hours later. Efficacy against live D. variabilis at 6 hours for Group 1 was 95 – 100 % and for Group 2 was 38 – 48 %; efficacy at 12 hours for Group 1 was 97 – 100 % and for Group 2 was 27 – 59 %. Efficacy against A. americanum at 6 hours for Group 1 was 94 – 100 % and for Group 2 was < 0 – 38 %; efficacy at 12 hours for Group 1 was 98 – 100 % and for Group 2 was 1 – 40 %. Live and total (total live and dead attached) tick counts in Group 1 against both tick species were significantly lower (p ≤ 0.05) than Group 2 and 3 at all time points. The number of live or total ticks on Group 2 dogs was never significantly lower when compared to the respective number of ticks on Group 3 (controls). This study demonstrated that an imidacloprid/flumethrin collar was highly efficacious (94 – 100 %) at repelling and killing ticks on dogs at 6 and 12 hours post-infestation and was more efficacious than afoxolaner on all challenge days.
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Ohmes, C.M., Hostetler, J., Davis, W.L. et al. Comparative Efficacy of an Imidacloprid/Flumethrin Collar (Seresto®) and an Oral Afoxolaner Chewable (NexGard®) against Tick (Dermacentor variabilis and Amblyomma americanum) Infestations on Dogs: a Randomised Controlled Trial. Parasitol Res 114 (Suppl 1), 81–94 (2015). https://doi.org/10.1007/s00436-015-4515-y
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DOI: https://doi.org/10.1007/s00436-015-4515-y