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Table 3 Arithmetic mean and geometric mean of Ixodes ricinus (attached and not attached) counts 48 h after treatment (Day 2) or 48 h after each re-infestation (Days 9, 16, 23, 30, 37)

From: Efficacy of a fixed combination of permethrin 54.5% and fipronil 6.1% (Effitix®) in dogs experimentally infested with Ixodes ricinus

Day

Group 1: negative control

Group 2: treated (Effitix®)

Arithmetic mean

Standard deviation

Geometric mean

Arithmetic mean

Standard deviation

Geometric mean

+2

21.3

3.1

21.1

0.5 (1)

0.8

0.4

+9

17.5

3.4

17.2

0.0 (1)

0.0

0.0

+16

16.5

3.8

16.2

0.0 (1)

0.0

0.0

+23

19.7

3.1

19.5

0.0 (1)

0.0

0.0

+30

20.8

3.8

20.5

1.5 (1)

2.8

0.7

+37

21.2

2.1

21.1

1.0 (1)

0.9

0.8

  1. 1: Group 2 differed statistically significantly (p < 0.05) from the untreated control Group 1 on all assessment days.