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Table 1 Arithmetic mean live Haemaphysalis longicornis counts and ranges for control dogs and dogs treated with Seresto® and percent efficacy relative to control at 48 h after infestations

From: Sustained efficacy of collars containing 10% w/w imidacloprid and 4.5% w/w flumethrin (Seresto®) in dogs against laboratory challenge with Haemaphysalis longicornis (Neumann, 1901) ticks

Day

Control

Seresto®

Efficacy compared to control

Group

Mean

Range

Dogs with ticks

Group

Mean

Range

Dogs with ticks

%Efficacya

Test statistic

3

3

28.6

14–43

8/8

2

3.4

0–7

5/8

88.2

t(14) = 6.47, P < 0.0001

9

3

38.8

30–50

8/8

2

0.1

0–1

1/8

99.7

t(14) = 18.41, P < 0.0001

30

3

36.9

27–45

8/8

2

0.1

0–1

1/8

99.7

t(14) = 20.18, P < 0.0001

58

3

29.3

17–37

8/8

2

0

0–0

0/8

100

t(14) = 11.74, P < 0.0001

94

3

28.6

14–43

8/8

1

0.5

0–2

3/8

98.3

t(14) = 7.56, P < 0.0001

121

3

36.9

27–45

8/8

1

0

0–0

0/8

100

t(14) = 20.29, P < 0.0001

149

3

29.3

17–37

8/8

1

0

0–0

0/8

100

t(14) = 11.74, P < 0.0001

170

3

27.3

19–35

8/8

1

0

0–0

0/8

100

t(14) = 13.46, P < 0.0001

198

3

32.5

25–40

8/8

1

0

0–0

0/8

100

t(14) = 16.95, P < 0.0001

229

3

17.4

7–40

8/8b

1

0

0–0

0/8

100

t(14) = 4.59, P = 0.0004

240

3

32.5

15–45

8/8

1

0.1

0–1

1/8

99.6

t(14) = 9.97, P < 0.0001

  1. aPairwise comparison of tick counts between control and treated groups statistically significantly different at all time points (P < 0.001)
  2. bOn day 229, two out of eight dogs presented with < 13 ticks (7 and 8 ticks, respectively)