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Table 3.

Individual Demodex counts for each dog at each evaluation and mean percentage of mite count reduction for each group.

Day -2 Day 27 Day 55 Day 84
Group 1: combination of fipronil, amitraz, and (S)-methoprene at 28-day intervals Dog 1* 2,454 - - -
Dog 2 796 0 10 2
Dog 3 443 115 191 2
Dog 4 238 15 0 0
Dog 5 158 12 0 0
Dog 6 68 0 0 0
Geometric mean 361.7 6.5 3.6 0.6
Percent reduction 97.4% 98.5% 99.8%
Group 2: combination of fipronil, amitraz, and (S)-methoprene at 14-day intervals Dog 7 1,335 7 3 0
Dog 8 722 129 1 0
Dog 9 504 69 0 0
Dog 10 368 0 0 0
Dog 11 77 0 0 0
Dog 12 20 1 0 0
Geometric mean 257.0 6.3 0.4 0.0
Percent reduction 97.6% 99.8% 100.0%
Group 3: combination of amitraz and metaflumizone at 28-day intervals Dog 13 842 11 0 0
Dog 14 615 2 1 0
Dog 15 436 16 0 0
Dog 16 327 1 0 0
Dog 17 68 5 0 0
Dog 18 9 1 0 0
Geometric mean 191.8 3.9 0.1 0.0
Percent reduction 97.9% 99.9% 100.0%

The post-treatment number counts differed significantly (p < 0.05) from the Inclusion mean mite counts on all post-treatment assessment days for all three treated groups.

*

Dog 1 died during the second week (Day 12) from its generalized demodicosis.

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