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Table 3 Efficacy of imidacloprid 10%/flumethrin 4.5% collars against Ctenocephalides felis felis on dogs 24 h after each infestation

From: Efficacy of an imidacloprid/flumethrin collar against fleas, ticks, mites and lice on dogs

Study Day or Week Activity and efficacy (%)
Day −1 or −2 100 fleas
Day 0 Collars fitted to dogs in treated groups
Day 2 (therapeutic efficacy) 99.8 100 100 100
Day 8 100 100
Week 4 100 100 99.8 100
Week 8 99.7 99.3 98.9 100
Week 12 99.3 100 98.9 100
Week 16 98.5 100 98.4 99.3
Week 20 99.7 100 97.9 99.7
Week 24 99.2 100 98.2 99.9
Week 28 100 96.4 99.4
Week 32 99.7 96.6 96.2
Week 35 99.7 94.3 96.3