Five-month comparative efficacy evaluation of three ectoparasiticides against adult cat fleas (Ctenocephalides felis), flea egg hatch and emergence, and adult brown dog ticks (Rhipicephalus sanguineus sensu lato) on dogs housed outdoors

• DOI: 10.1007/s00436-014-4262-5
• Publication Date: 2014-12-29T07:21:12Z
• Authors: Marie Varloud; Elizabeth Hodgkins
• Keywords: Ctenocephalides; Rhipicephalus sanguineus

This study was designed to compare the efficacy of three topical combinations on dogs in outdoor conditions against adult cat fleas (Ctenocephalides felis), flea egg hatch and emergence, brown dog ticks (Rhipicephalus sanguineus sensu lato). Treatment performed day 0 with a placebo; dinotefuran, pyriproxifen permethrin (DPP); fipronil (S)-methoprene (FM) or imidacloprid (IP). Dogs (n = 32), housed outdoors for 7 months, were treated monthly four consecutive months (on days 0, 30, 60 90) infested ~100 unfed 14, 55, 74, 115 150 ~50 28, 44, 88 104. Adult counted removed 24 h after infestation. Immediately removal, reinfested new 72 prior collection up 48 h. Flea eggs incubated 32 days, newly emerged adults counted. Ticks each FM had >90 % at time point variable (38.0-99.6 %). Efficacy IP <90 64 30 first post-treatment. No laid groups until infestation carried out >60 last treatment. Despite challenging weather conditions, DPP highly effective, providing as well immature every study.