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Table 2 Flea counts, number of dogs with zero flea counts and percent efficacy of 54.5% permethrin and 6.1% fipronil solution. Range, median, arithmetic and geometric means of flea counts of 54.5% permethrin and 6.1% fipronil-treated (group A) and of sham-treated (group B) dogs, number of group A and group B dogs with zero flea counts at the beginning of the trial (day 0) and after 14, 28, 56 and 84 days and percent efficacy of the 54.5% permethrin and 6.1% fipronil solution

From: A field trial of a fixed combination of permethrin and fipronil (Effitix®) for the treatment and prevention of flea infestation in dogs living with sheep

  Day 0 Day 14 Day 28 Day 56 Day 84
  Flea counts
Group A B A B A B A B A B
Range 18–69 18–48 0–17 14–45 0–48 11–46 0–17 18–51 0–36 14–44
Median 29 28 0 33 1 35 0 32 0 28
Arithmetic mean 31.5 29.3 3.1 30.7 7.4 34.4 2.3 32.4 4.7 28.1
Geometric mean 29.6 28.3 0.8 29.4 1.3 32.7 0.7 31.5 1.0 26.9
  Number (%) of dogs with zero flea counts
Group A (n = 15) 0 (0) 10 (71.4) 6 (42.9) 10 (71.4) 10 (71.4)
Group B (n = 15) 0 (0) 0 (0) 0 (0) 0 (0) 0 (0)
  Percent efficacy of 54.5% permethrin and 6.1% fipronil solution
Arithmetic mean   89.8 78.6 92.9 83.3
Geometric mean   97.1 96.1 97.8 96.6