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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