Table 1.

Efficacy of a new combination of fipronil and permethrin against Rhipicephalus sanguineus and Ixodes ricinus (Study A)

Tick species	Study day	Geometric mean of live ticks
		Untreated control dogs (n = 8)	Treated dogs (n = 8)	Efficacy (%)
R. sanguineus	2	31.8	0.0	100.0*
R. sanguineus	9	24.8	0.0	100.0*
R. sanguineus	16	27.8	0.0	100.0*
R. sanguineus	23	22.8	0.0	100.0*
R. sanguineus	30	24.7	0.7	96.7*
I. ricinus	2	36.7	0.0	100*
I. ricinus	9	32.5	0.0	100.0*
I. ricinus	16	30.7	0.0	100.0*
I. ricinus	23	31.6	0.0	100.0*
I. ricinus	30	33.3	0.3	99.2*

*Significant difference between the tick population means of the treated and control groups (p = 0.005).